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Last update: 2017-09-24

VdS FG

- Galaxies of the Arp Catalogue -

And (4) Cep (3) CVn (5) Lep (1) Peg (9) Tri (1)
Ari (3) Cet (1) Dra (1) LMi (3) Per (1) UMa (16)
Boo (1) Cnc (1) Gem (1) Lyn (2) Psc (5) UMi (1)
Cam (3) Com (3) Leo (10) Ori (1) Ser (2) Vir (6)

Arp 1 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC2857, UGC5000, Arp1
Type: GLX
Constellation: UMa
Coordinates: 09h24m37.70s / +49°21'25.69"
Brightness / Size: v12.3 mag / 2.2x2.0'
8" f/6, 150x, Bortle 4
Round, evenly bright, very faint.
DIFFICULT

Arp 5 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3664, UGC6419, Arp5
Group: NGC3640 Group, Leo II Group
Type: GLX
Constellation: Leo
Coordinates: 11h24m24.26s / +03°19'29.95"
Brightness / Size: v12.6 mag / 2.0x1.9'
8" f/6, 133x, Bortle 4
Tried without success at 96x & 133x. I was too tired.
FAILED

Arp 6 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC2537, UGC4274, Arp6, H4.55, Bear's Paw Galaxy
Group: NGC2841 Group
Type: GLX
Constellation: Lyn
Coordinates: 08h13m14.64s / +45°59'23.25"
Brightness / Size: v11.7 mag / 1.7x1.5'
8" f/6, 150x, Bortle 6+, NELM 5.2, SQM-L 19.6
Round, evenly bright, well defined shape. Barely seen with direct vision.

EASY
8" f/6, 150x, Bortle 4
Round, evenly bright, barely seen with direct vision. At 37x very small, round. Differences in brightness not noticed.
EASY

Arp 13 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC7448, UGC12294, Arp13, H2.251
Group: NGC7448 Group
Type: GLX
Constellation: Peg
Coordinates: 23h00m03.59s / +15°58'49.31"
Brightness / Size: v11.4 mag / 2.7x1.2'
8" f/6, 80x, Bortle 4
Fairly easy, slightly elongated.
EASY

Arp 16 (GLX)

DSS
© DSS II (blue) - 10×10'
Name: M66, NGC3627, UGC6346, Arp16
Group: Arp317, M66 Group, Leo Triplet
Type: GLX
Constellation: Leo
Coordinates: 11h20m15.03s / +12°59'28.64"
Brightness / Size: v8.9 mag / 9.3x4.2'
Forms together with M65 & NGC3628 the Leo Triplet (Arp317).

B 40mm, 8x, Bortle 6, NELM 5.5, SQM-L 19.2
Oval, faint and anything but evident.

MODERATE
B 40mm, 8x, Bortle 4, NELM 6.0+, SQM-L 21.0
Well visible with averted vision, oval, evenly bright. Messier 66 was about 30° degrees above the horizon.

MODERATE
4.5" f/8, 28x, Bortle 7+
A bit brighter than M65, oval with brighter core. Some apparent field stars at the edge of the galaxy. At 100x the oval core is evident.

EASY
8" f/6, 37x, Bortle 4
Oval with distinct, bright and also oval core area.
EASY

Arp 18 (GLX)

DSS
© DSS II (blue) - 6×6'
Name: NGC4088, UGC7081, Arp18, H1.206
Type: GLX
Constellation: UMa
Coordinates: 12h05m34.19s / +50°32'20.50"
Brightness / Size: v10.6 mag / 5.6x2.1'
8" f/6, 37x, Bortle 6+, NELM 5.3, SQM-L 19.7
At 37x obviously elongated, rather evenly bright. At 80x the center appeared bulgy. I should have a closer look next time.
EASY

Arp 23 (GLXGRP)

DSS
© DSS II (blue) - 15×15'
Name: Arp23
Type: GLXGRP
Constellation: CVn
Coordinates: 12h41m43.00s / +41°12'00.00"

Group Members:
NGC4618 (IC3667, UGC7853, H1.178, H1.179) v10.8 mag 4.2x3.4' (25°)
NGC4625 (IC3675, UGC7861, H2.660) v12.3 mag 1.3x1.2' (160°)
4.5" f/8, 60x, Bortle 6, NELM 5.3, SQM-L 19.7
I just focused on the bright NGC4618, which appeared roundish and almost evenly bright with averted vision.

MODERATE
8" f/6, 66x, Bortle 5
NGC4618 is the larger and brighter one and could be well seen with averted vision as roundish brightening. The galaxy appeared brighter towards the north edge. NGC4625 in comparison is much fainter, also roundish, evenly bright and barely visible with averted vision.
MODERATE

Arp 25 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC2276, UGC3740, Arp25
Group: Arp114
Type: GLX
Constellation: Cep
Coordinates: 07h27m14.48s / +85°45'16.20"
Brightness / Size: v11.4 mag / 2.8x2.7'
NGC2276 & NGC2300 together are also known as Arp114.

8" f/6, 80x, Bortle 6
Not seen at 80x & 200x.

FAILED
8" f/6, 80x, Bortle 4
Barely seen with averted vision nearby a brighter star as very faint glow.
DIFFICULT

Arp 26 (GLX)

DSS
© DSS II (blue) - 29×29'
Name: M101, NGC5457, UGC8981, Arp26, Pinwheel Galaxy
Type: GLX
Constellation: UMa
Coordinates: 14h03m12.58s / +54°20'55.50"
Brightness / Size: v7.9 mag / 28.5x28.3'
B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Quite faint, relatively large, round, evenly bright.

DIFFICULT
B 40mm, 8x, Bortle 5, NELM 5.5
Barely seen with direct vision. Less evident. Quite large, roundish, nearly evenly bright.

EASY
S 60mm, 23x, Bortle 7
Observed from city with a cheap spotting scope from a discounter! Difficult to hold. Relatively large, round, almost evenly bright glow.

DIFFICULT
4.5" f/8, 28x, Bortle 4, NELM 6.0
Large, very diffuse, slight brightening toward the middle, nearly round.

EASY
8" f/6, 37x, Bortle 4
Large, bright, diffuse nebula with slightly brighter center. At 100x tendency of spiral structure. I will spend more time for extracting some details!
EASY

Arp 27 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3631, UGC6360, Arp27, H1.226
Type: GLX
Constellation: UMa
Coordinates: 11h21m02.94s / +53°10'09.95"
Brightness / Size: v10.4 mag / 5.0x4.8'
8" f/6, 37x, Bortle 4
At 37x moderately large, roundish, diffuse, nearly evenly bright with slightly brighter core. At 100x the core area is brighter, roundish and obviously extended. Bright core surrounded by faint halo. Core area seems little shifted to geometric center.
EASY

Arp 29 (GLX)

DSS
© DSS II (blue) - 12×12'
Name: NGC6946, UGC11597, Arp29, H4.76, Fireworks Galaxy
Type: GLX
Constellation: Cep
Coordinates: 20h34m52.33s / +60°09'13.24"
Brightness / Size: v9.0 mag / 11.5x9.8'
Bright spiral galaxy, which is located only 40' southeast of the also evident and rich open cluster NGC6939. Both objects together give a nice view!

B 40mm, 8x, Bortle 4, NELM 6.1, SQM-L 21.1
Fairly faint, round, evenly bright. Less evident with averted vision.

MODERATE
80mm f/6.25, 25x, Bortle 6-, SQM-L 19.5
Roundish, rather faint and less evident brightening.

MODERATE
8" f/6, 37x, Bortle 4, NELM 6.1, SQM-L 21.1
Large, round, faint, somewhat irregular shape. At 100x I could rudimentarily percept the northeastern spiral arm with averted vision. Overall the galaxy appeared slightly mottled.
EASY

Arp 31 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: IC167, UGC1313, Arp31
Type: GLX
Constellation: Ari
Coordinates: 01h51m08.65s / +21°54'44.80"
Brightness / Size: v13.6 mag / 2.9x1.9'
About 5' northwestward you can find the very compact NGC694 with high surface brightness.

8" f/6, 150x, Bortle 4-, SQM-L 20.8
Extremely faint, small, roundish. Glimpsed with averted vision.
DIFFICULT

Arp 34 (GLXGRP)

DSS
© DSS II (blue) - 6×6'
Name: Arp34
Type: GLXGRP
Constellation: Com
Coordinates: 12h41m32.00s / +26°04'00.00"

Group Members:
NGC4613 v15.2 mag 0.5x0.4'
NGC4614 (UGC7851) v13.3 mag 0.9x0.8'
NGC4615 (UGC7852) v13.1 mag 1.6x0.7' (125°)
8" f/6, 96x, Bortle 4
This observation was in May 2012 and I only focused on NGC4615, but without any success. I'm sure there should be more possible with 8 inch!
FAILED

Arp 37 (GLX)

DSS
© DSS II (red) - 8×8'
Name: M77, NGC1068, UGC2188, Arp37
Group: M77 Group
Type: GLX, SY2
Constellation: Cet
Coordinates: 02h42m40.77s / -00°00'47.84"
Brightness / Size: v8.9 mag / 7.3x6.3'
8" f/6, 37x, Bortle 4
Very bright, compact nucleus with round, weaker halo. Extremely faint outer regions not seen.
EASY

Arp 38 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC6412, UGC10897, Arp38, H6.41
Type: GLX
Constellation: Dra
Coordinates: 17h29m37.52s / +75°42'15.59"
Brightness / Size: v11.6 mag / 2.5x2.2'
8" f/6, 96x, Bortle 4
At 37x seen as roundish, diffuse brightening. At 96x irregular brightness.
EASY

Arp 72 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp72
Type: GLXGRP
Constellation: Ser
Coordinates: 15h46m56.00s / +17°53'00.00"

Group Members:
NGC5994 v14.8 mag 0.4x0.2'
NGC5996 (UGC10033, H2.97) v12.8 mag 1.7x0.9' (20°)
The much more fainter NGC5994 is located southwestern of NGC5996.

8" f/6, 200x, Bortle 4, NELM 6.1, SQM-L 21.0
I only focused on the brighter NGC5996, which was well seen with averted vision as slightly oval nebula, getting somewhat brighter toward the middle.
MODERATE

Arp 76 (GLXGRP)

DSS
© DSS II (red) - 15×15'
Name: Arp76
Type: GLXGRP
Constellation: Vir
Coordinates: 12h36m48.00s / +13°11'30.00"

Group Members:
IC3583 (UGC7784) v12.8 mag 2.2x1.1'
M90 (NGC4569, UGC7786) v9.5 mag 9.9x4.4' (23°)
The fainter IC3583 is located NNW of M90.

8" f/6, 80x, Bortle 4-, NELM 5.8+, SQM-L 21.0
SQM-L 20.7: I only focused on the bright Messier 90. Very elongated (1:4) with bright, very compact core. Core area also slightly elongated. Otherwise rather evenly bright.
EASY

Arp 78 (GLXGRP)

DSS
© DSS II (blue) - 10×10'
Name: Arp78
Type: GLXGRP
Constellation: Ari
Coordinates: 01h59m18.00s / +18°59'30.00"

Group Members:
NGC770 (UGC1463) v12.9 mag 1.1x0.8' (10°)
NGC772 (IC646, UGC1466, H1.112) v10.3 mag 7.4x4.9' (135°)
8" f/6, 80x, Bortle 3-, SQM-L 21.0
The bright NGC772 was already evident at 37x, oval with much brighter center and visible with direct vision. At 80x also the fainter companion NGC770 was well visible with averted vision as quite compact, roundish brightening.
NGC772 appeared in a 10 inch Dobsonian slightly drop-shaped.
EASY

Arp 84 (GLXGRP)

DSS
© DSS II (blue) - 7×7'
Name: Arp84
Type: GLXGRP
Constellation: CVn
Coordinates: 13h58m35.00s / +37°26'00.00"

Group Members:
NGC5394 (UGC8898, H1.191) v13.1 mag 1.7x0.8' (60°)
NGC5395 (UGC8900, H1.190) v11.7 mag 2.7x1.3' (5°)
8" f/6, 100x, Bortle 4, NELM 6.0
Both galaxies are well visible with averted vision. NGC5395 appears obviously oval and evenly bright, whereas NGC5394 appears as a very compact brightening.
MODERATE

Arp 85 (GLXGRP)

DSS
© DSS II (blue) - 20×20'
Name: Arp85
Type: GLXGRP
Constellation: CVn
Coordinates: 13h29m55.00s / +47°13'00.00"

Group Members:
M51 (NGC5194, UGC8493, Whirlpool Galaxy) v8.4 mag 11.2x6.9' (163°)
NGC5195 (UGC8494, H1.186) v9.6 mag 5.9x4.6' (27°)
B 40mm, 8x, Bortle 6-, NELM 5.0
Roundish, evenly bright, faint, less apparent.

MODERATE
B 40mm, 8x, Bortle 5, NELM 5.5
Barely visible with direct vision, evident with averted vision. Round, evenly bright.

EASY
4.5" f/8, 60x, Bortle 6, NELM 5.3, SQM-L 19.7
M51: Round with bright, very compact core, otherwise evenly bright.

NGC5195: Slightly oval with brigher center.

EASY
4.5" f/8, 75x, Bortle 4, NELM 6.0
Both galaxies are very evident, visible with direct vision and easily separable. M51 appears quite large, nearly evenly bright and roundish with a very distinct, bright and compact center. NGC5195 in comparison is obviously smaller with an also bright, compact center, which is surrounded by a fainter, roundish halo.

EASY
8" f/6, 37x, Bortle 4, SQM-L 21.0
M51: At 37x bright, stellar core with round, relatively faint halo. At 100x with averted vision two evident spiral arms, winding widely around the core. A foreground star southwest of the core within the halo.

NGC5195: At 37x roundish with obviously brighter, very compact core. At 100x oval halo around the very bright core, whereas the core is shifted to the eastern edge of the halo.
EASY

Arp 86 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp86
Type: GLXGRP
Constellation: Peg
Coordinates: 23h47m04.00s / +29°28'30.00"

Group Members:
NGC7752 (UGC12779) b14.3 mag 0.9x0.5'
NGC7753 (UGC12780, H2.213) v12.2 mag 2.9x1.9' (50°)
8" f/6, 100x, Bortle 4
I have only tried the brighter NGC7753: Fairly faint, diffuse, slightly oval, slight brightening toward the middle.
MODERATE

Arp 87 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp87
Type: GLXGRP
Constellation: Leo
Coordinates: 11h40m44.50s / +22°26'20.00"

Group Members:
MCG+4-28-20 (PGC36228) b15.0 mag 0.5x0.2' (55°)
NGC3808 (UGC6643, H3.338) v13.4 mag 1.6x0.9' (123°)
8" f/6, 150x, Bortle 3, SQM-L 21.4
SQM-L 21.0: I only observed the brighter NGC3808. It appeared as pretty faint, small brightening.
MODERATE

Arp 89 (GLXGRP)

DSS
© DSS II (blue) - 7×7'
Name: Arp89
Type: GLXGRP
Constellation: Cnc
Coordinates: 08h42m44.00s / +14°17'00.00"

Group Members:
MCG+2-22-6 (PGC24469) v14.2 mag 1.5x0.4'
NGC2648 (UGC4541, H3.49) v11.8 mag 3.2x1.1' (150°)
8" f/6, 150x, Bortle 4
Only the bright NGC2648 was evident with averted vision: Elongated, slight brightening toward the middle. Probably only the bright core area was visible.
EASY

Arp 91 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp91
Type: GLXGRP
Constellation: Ser
Coordinates: 15h34m34.00s / +15°12'00.00"

Group Members:
NGC5953 (UGC9903, H2.178) v12.0 mag 1.6x1.3' (50°)
NGC5954 (UGC9904, H2.179) v12.2 mag 1.3x0.6' (5°)
8" f/6, 200x, Bortle 4
NGC5953: Slightly oval with brighter core. Oval shape comes from nearby NGC5954, which appeared much fainter.

NGC5954: Fairly small & compact. Difficult to separate from nearby NGC5993. Barely seen with averted vision.

A more detailed observation of this galaxy pair will follow.
MODERATE

Arp 94 (GLXGRP)

DSS
© DSS II (red) - 10×10'
Name: Arp94
Type: GLXGRP
Constellation: Leo
Coordinates: 10h23m30.00s / +19°52'30.00"

Group Members:
NGC3226 (UGC5617, H2.28) v11.4 mag 2.5x2.2' (25°)
NGC3227 (UGC5620, H2.29) v10.3 mag 6.2x4.5' (153°)
8" f/6, 37x, Bortle 4
Both galaxies are quite well separated at low magnification. The more compact NGC3226 appeared roundish with fairly bright, compact core. NGC3227 appeared oval with brighter, nearly stellar center.
EASY

Arp 99 (GLXGRP)

DSS
© DSS II (blue) - 12×12'
Name: Arp99
Type: GLXGRP
Constellation: Peg
Coordinates: 23h15m12.00s / +19°00'00.00"

Group Members:
NGC7547 (UGC12453) v13.7 mag 1.1x0.5' (95°)
NGC7549 (UGC12457) v13.0 mag 2.8x0.7' (8°)
NGC7550 (UGC12456, H3.181) v12.2 mag 1.4x1.2' (150°)
8" f/6, 96x, Bortle 4-, NELM 5.7+, SQM-L 20.8
SQM-L in the target region: 20.6

NGC7547: At 96x quite compact, at 133x evenly bright. Very faint. I guess that I only saw the bright core area.

NGC7549: At 96x roundish, at 133x roundish to slightly oval, diffuse, rather faint.

NGC7550: Brightest member and barely visible with direct vision, evident with averted vision, roundish, center somewhat brighter, otherwise rather evenly bright. At 133x brighter core, which appeared very compact.
MODERATE

Arp 104 (GLXGRP)

DSS
© DSS II (blue) - 8×8'
Name: Arp104, Keenan's System
Type: GLXGRP
Constellation: UMa
Coordinates: 13h32m10.00s / +62°44'00.00"

Group Members:
NGC5216 (UGC8528, H2.841) v12.6 mag 1.8x1.2' (135°)
NGC5218 (UGC8529, H2.842) v12.3 mag 1.8x1.3' (80°)
On the DSS image the connection of both galaxies is apparent. NGC5218 is a spiral (SBb), whereby NGC5216 is an elliptical galaxy of the type E0.

8" f/6, 200x, Bortle 5
Under moderate conditions I could only see the brighter NGC5218 as roundish, faint brightening. NGC5216 stayed hidden to me, but should be surely visible with 8 inch aperture.
MODERATE

Arp 112 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp112
Type: GLXGRP
Constellation: Peg
Coordinates: 00h01m30.00s / +31°26'30.00"

Group Members:
MCG+5-1-26 (PGC111) b16.5 mag 0.6x0.2'
NGC7805 (UGC12908, H3.855) v13.3 mag 1.2x0.9' (30°)
NGC7806 (UGC12911, H3.856) v13.5 mag 1.1x0.8' (5°)
8" f/6, 210x, Bortle 4
The brighter galaxies (NGC7805 & NGC7806) were well separable. The faint MCG+05-01-026 is not visible with 8 inch aperture. NGC7806 is the middle one of the three galaxies.

NGC7805: Evenly bright, roundish. In comparison to NGC7806 slightly larger and brighter. Well visible with averted vision.

NGC7806: Roundish, fairly faint, rather at the limit of perception.
DIFFICULT

Arp 113 (GLXGRP)

DSS
© DSS II (blue) - 6×6'
Name: Arp113, VV166, Holm6
Type: GLXGRP
Constellation: And
Coordinates: 00h18m23.30s / +30°03'40.00"

Group Members:
NGC67 (PGC1185) v14.2 mag 0.4x0.3'
NGC68 (UGC170, H5.16) v13.2 mag 1.2x1.1' (90°)
NGC69 (PGC1191) v14.7 mag 0.9x0.8'
NGC70 (IC1539, UGC174) v13.5 mag 2.1x1.7' (5°)
NGC71 (UGC173) v13.3 mag 1.7x1.3' (90°)
NGC72 (UGC176) v13.8 mag 1.4x1.1' (85°)
80mm f/6.25, 62x, Bortle 3, SQM-L 21.3

FAILED
120mm f/5, 100x, Bortle 3, SQM-L 21.3
I only classified this group as moderately difficult, because I could see a diffuse, roundish brightening near faint field stars with averted vision without any problems. I'm pretty sure, that this is NGC68 as brightest member of the group.

MODERATE
8" f/6, 171x, Bortle 3, NELM 6.4
Overall difficult group with 8 inch, which is embedded between faint field stars. NGC68 (brightest western) is brightest member and appeared at 171x roundish with slightly brighter center, held with averted vision. NGC71 (southeastern of NGC68) was glimpsed as roundish, diffuse brightening. NGC70 (northeastern of NGC68) I tried without any success.

DIFFICULT
12.5" f/4.5, 205x, Bortle 3, SQM-L 21.3
NGC68: Round, less condensed. Brightest and most obvious galaxy of the group.

NGC70: Appeared very diffuse between two faint field stars. Shape hardly perceptible.

NGC71: Well visible with averted vision as compact brightening.

NGC72: Compact, slightly oval.
MODERATE

Arp 114 (GLXGRP)

DSS
© DSS II (blue) - 12×12'
Name: Arp114
Type: GLXGRP
Constellation: Cep
Coordinates: 07h29m40.00s / +85°44'00.00"

Group Members:
NGC2276 (UGC3740, Arp25) v11.4 mag 2.8x2.7' (50°)
NGC2300 (UGC3798) v11.0 mag 2.8x2.3' (80°)
NGC2276 is also known as Arp25.

8" f/6, 80x, Bortle 6
NGC2276: Not seen at 80x & 200x.

NGC2300: Barely seen with averted vision as round brightening.

DIFFICULT
8" f/6, 80x, Bortle 4
NGC2276: Barely seen with averted vision nearby a brighter star as very faint glow. Difficult.

NGC2300: Bright core with faint, round halo. Barely seen with direct vision, very evident with averted vision.
MODERATE

Arp 116 (GLXGRP)

DSS
© DSS II (blue) - 12×12'
Name: Arp116
Type: GLXGRP
Constellation: Vir
Coordinates: 12h43m37.00s / +11°34'00.00"

Group Members:
M60 (NGC4649, UGC7898) v8.8 mag 7.4x6.0' (105°)
NGC4647 (UGC7896, H3.44) v11.3 mag 2.9x2.3'
4.5" f/8, 60x, Bortle 6, NELM 5.3, SQM-L 19.7
Messier 60: At 60x very bright center with fainter, slightly oval halo. At 28x Messier 60 appeared more roundish. Easily seen with direct vision.

NGC4647: Quite faint, roundish, evenly bright. Only seen with averted vision.

EASY
8" f/6, 80x, Bortle 4, SQM-L 21.1
SQM-L in the target region: 20.8

Messier 60: Very bright, round, extended core area with large, fainter, round halo. Of course also well visible at low power.

NGC4647: Roundish, evenly bright. Evident with averted vision.
EASY

Arp 120 (GLXGRP)

DSS
© DSS II (blue) - 12×12'
Name: Arp120, The Eyes
Type: GLXGRP
Constellation: Vir
Coordinates: 12h27m42.00s / +13°02'00.00"

Group Members:
NGC4435 (UGC7575, H1.28.1) v10.8 mag 3.0x2.2' (15°)
NGC4438 (UGC7574, H1.28.2) v10.2 mag 8.5x3.0' (20°)
These galaxies were first called 'The Eyes' by Leland S. Copeland in 1955 in a 'Sky & Telescope' article, based on their visual appearance.

8" f/6, 37x, Bortle 5
NGC4435 appears with nearly stellar, bright core, NGC4438 is slightly elongated with also bright core.
EASY

Arp 123 (GLXGRP)

DSS
© DSS II (red) - 5×5'
Name: Arp123
Type: GLXGRP
Constellation: Lep
Coordinates: 05h22m35.00s / -11°30'00.00"

Group Members:
NGC1888 (H2.289) v11.9 mag 3.2x1.2' (150°)
NGC1889 v13.1 mag 0.6x0.4' (165°)
8" f/6, 133x, Bortle 4
I could only saw the brighter NGC1888: At 80x more roundish, possibly caused by nearby NGC1889. At 133x more elongated. The smaller NGC1889 wasn't surely visible at 171x.
MODERATE

Arp 134 (GLXGRP)

DSS
© DSS II (blue) - 15×15'
Name: Arp134
Type: GLXGRP
Constellation: Vir
Coordinates: 12h29m50.00s / +07°58'30.00"

Group Members:
M49 (NGC4472, UGC7629) v8.3 mag 10.2x8.3' (155°)
UGC7636 (PGC41258) v14.8 mag 1.1x0.9'
The much more fainter UGC7636 is located southeastern of M49, western of a brighter star.

80mm f/6.25, 25x, Bortle 7
M49: Still visible with direct vision but less evident. Roundish, brightening toward the middle.

EASY
8" f/6, 37x, Bortle 5
M49: Very bright, slightly oval nucleus with faint halo.
EASY

Arp 135 (GLXGRP)

DSS
© DSS II (blue) - 10×10'
Name: Arp135
Type: GLXGRP
Constellation: Per
Coordinates: 02h40m24.01s / +39°03'47.70"

Group Members:
NGC1023 (UGC2154, H1.156) v9.3 mag 8.7x3.0' (82°)
NGC1023A v13.0 mag 1.6x1.4'
NGC1023A is the faint, oval brightening at the southeastern edge of NGC1023.

B 40mm, 8x, Bortle 4-, NELM 5.7+, SQM-L 20.9
The observation is only related to the bright NGC1023.

FAILED
80mm f/6.25, 50x, Bortle 6-, NELM 5.0+, SQM-L 19.6
NGC1023: At 20x quite small, roundish to slightly oval. At 50x somewhat elongated with brighter center.

EASY
4.5" f/8, 90x, Bortle 6-, NELM 5.0+, SQM-L 19.6
NGC1023: At 36x oval with much brighter core. Located nearby an evident star pair. At 90x obviously elongated with very bright, bulgy core, spindle-shaped.

EASY
8" f/6, 80x, Bortle 4
NGC1023: Bright, compact core most obvious and seen with direct vision. Fainter outer extension seen with averted vision. Very elongated.

EASY
12.5" f/4.5, 96x, Bortle 3, SQM-L 21.3
NGC1023: Bright, compact, round nucleus with slightly oval, brighter core area. The much fainter outer regions appeared very elongated with averted vision.

EASY
33" f/3.9, 300x, Bortle 3, SQM-L 21.4
Besides the very bright NGC1023 I tried to see the faint companion NGC1023A. There was probably an irregularity in the halo of NGC1023 visible, but not sure.
EASY

Arp 145 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: UGC1840, Arp145
Type: GLX
Constellation: And
Coordinates: 02h23m11.42s / +41°22'04.77"
Brightness / Size: v13.4 mag / 1.5x1.3'
Arp145 actually consists of two galaxies: The brighter PGC9062 (=UGC1840) and the much fainter PGC9060 (v17.8m), which is located in the southwestern part of the "donut".

8" f/6, 200x, Bortle 4
Small, round, slightly darkening toward the edge. Faint star pair nearby. The "donut" (that's no image artifact!) needs more aperture for sure.
Hint: Galaxy located less than 5' from a bright 5.8m star. I recommend an eyepiece with narrow field of view and less internal reflections! A 6mm ortho worked fine for me :-)
DIFFICULT

Arp 150 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: HCG95, Arp150
Type: GLXGRP
Constellation: Peg
Coordinates: 23h19m30.00s / +09°30'00.00"

Group Members:
MCG+1-59-46 (PGC71074) b16.1 mag 0.8x0.2'
MCG+1-59-48 (PGC71080) v15.2 mag 0.8x0.3'
NGC7609 v14.2 mag 1.3x1.1' (60°)
PGC71077 v16.1 mag 0.7x0.4'
8" f/6, 171x, Bortle 4-
This observation was a while back and I could only saw NGC7609 as very faint, roundish brightening, but at the limit of perception with averted vision. But don't expect too much from this Hickson/Arp group with 8 inch aperture.
DIFFICULT

Arp 152 (GLX)

DSS
© DSS II (blue) - 9×9'
Name: M87, NGC4486, UGC7654, Arp152
Group: Virgo-Cluster
Type: GLX
Constellation: Vir
Coordinates: 12h30m49.42s / +12°23'28.04"
Brightness / Size: v8.6 mag / 8.3x6.6'
8" f/6, 37x, Bortle 5
Round with bright, compact core area and faint halo.
EASY

Arp 155 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3656, UGC6403, H2.782, Arp155
Type: GLX
Constellation: UMa
Coordinates: 11h23m38.59s / +53°50'31.38"
Brightness / Size: v12.5 mag / 1.5x1.5'
The southern lump of NGC3656 is MCG+9-19-64 (b15.0m, 0.4x0.2'). Both form Arp155.

8" f/6, 200x, Bortle 3, NELM 6.5, SQM-L 21.6
Barely seen with direct vision. Roundish to slightly oval, nearly evenly bright. The southern extension (=MCG+9-19-64) wasn't visible.

EASY
8" f/6, 100x, Bortle 4
Fairly small, roundish, evenly bright. Located nearby an evident 12.77m field star.
MODERATE

Arp 157 (GLX)

DSS
© DSS II (blue) - 15×15'
Name: NGC520, UGC966, H3.253, Arp157
Type: GLX
Constellation: Psc
Coordinates: 01h24m35.07s / +03°47'32.68"
Brightness / Size: v11.4 mag / 3.7x1.5'
Arp157 also contains the faint galaxy UGC957, but NGC520 is much more interesting. UGC957 (b18.0m, 1.2x0.9') is located NNW of NGC520 and north of a fainter field star (see DSS image).

8" f/6, 66x, Bortle 4-, NELM 5.7+, SQM-L 20.8
SQM-L 20.6: At 66x evenly bright, elongated, evident with averted vision. At 133x slight broadening toward the south end. The very faint extensions and the dark lane were not visible.
MODERATE

Arp 159 (GLX)

DSS
© DSS II (red) - 5×5'
Name: NGC4747, UGC8005, Arp159, H2.344
Type: GLX
Constellation: Com
Coordinates: 12h51m45.72s / +25°46'27.90"
Brightness / Size: v12.4 mag / 3.3x1.3'
8" f/6, 96x, Bortle 4
Tried at 37x, 96x & 133x.
FAILED

Arp 162 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3414, UGC5959, Arp162, H2.362
Type: GLX
Constellation: LMi
Coordinates: 10h51m16.24s / +27°58'29.88"
Brightness / Size: v11.0 mag / 3.6x3.1'
8" f/6, 80x, Bortle 4-, SQM-L 20.9
At 37x the core was evident & rather compact with averted vision, surrounded by a faint halo. At 80x quite bright, compact, non-stellar core with evenly bright and round halo. Rather high surface brightness.
EASY

Arp 164 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC455, UGC815, Arp164
Type: GLX
Constellation: Psc
Coordinates: 01h15m57.64s / +05°10'43.51"
Brightness / Size: v12.7 mag / 2.0x1.2'
8" f/6, 66x, Bortle 4-, NELM 5.7+, SQM-L 20.8
SQM-L 20.6: Oval, evenly bright. At 133x better visible, but still almost evenly bright. I guess, that I only saw the brighter central area.
MODERATE

Arp 165 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC2418, UGC3931, Arp165
Type: GLX
Constellation: Gem
Coordinates: 07h36m37.52s / +17°53'02.31"
Brightness / Size: v12.2 mag / 1.8x1.8'
8" f/6, 100x, Bortle 4
Roundish, brightening toward the middle.
MODERATE

Arp 166 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp166
Type: GLXGRP
Constellation: Tri
Coordinates: 01h57m32.30s / +33°12'30.00"

Group Members:
NGC750 (UGC1430, H2.222) v11.9 mag 1.6x1.3' (170°)
NGC751 (UGC1431) v12.5 mag 1.2x1.2' (90°)
8" f/6, 96x, Bortle 5, NELM 5.5+, SQM-L 20.8
Both galaxies already visible at 37x as compact brightening. At 96x evident with averted vision, roundish to slightly oval, slight brightening toward the middle. At 171x not clearly separated, but NGC751 appeared as extension. At 218x both galaxies could be separated in few moments. NGC750 appeared larger.

MODERATE
8" f/6, 171x, Bortle 4, NELM 6.0+, SQM-L 21.1
NGC750 appeared round with brighter core. I meant to see this galaxy separated from its neighbour NGC751, but unsure and without dark space. NGC750 appeared interestingly somewhat more compact than NGC751 - maybe a mistake by myself!? However NGC750 was well visible with averted vision. I will have a closer look at this galaxy pair the next time.
MODERATE

Arp 168 (GLX)

DSS
© DSS II (blue) - 9×9'
Name: M32, NGC221, UGC452, Arp168
Group: Local Group
Type: GLX
Constellation: And
Coordinates: 00h42m41.83s / +40°51'54.61"
Brightness / Size: v8.1 mag / 8.5x6.5'
B 40mm, 8x, Bortle 4, NELM 6.1, SQM-L 21.1
Relatively well seen with direct vision, but nearly stellar.

EASY
80mm f/6.25, 25x, Bortle 6
Very bright and compact. Can be confused with a star. At higher magnification clearly extended.

EASY
8" f/6, 37x, Bortle 4
Round with very bright, stellar core, becoming weaker toward the edge.
EASY

Arp 170 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp170
Type: GLXGRP
Constellation: Peg
Coordinates: 23h17m14.00s / +18°42'30.00"

Group Members:
NGC7578A (UGC12477) v13.9 mag 0.7x0.6' (90°)
NGC7578B (UGC12478) v14.0 mag 1.7x1.2' (25°)
NGC7578C (PGC70936) b16.5 mag 0.3x0.2'
PGC70937 b18.1 mag 0.6x0.2'
Arp170 is part of Hickson 94. The brighter galaxy in the upper left corner on the DSS image is PGC70943 and not part of Arp170, but Hickson 94.

8" f/6, 171x, Bortle 4-, NELM 5.7+, SQM-L 20.8
SQM-L 20.6: The level of difficulty is only related to the two brightest group members (NGC7578A/B). The other members might be too faint for 8 inch aperture. At 66x I could easily see with averted vision around NGC7578A/B a faint, evenly bright glow, which appeared slightly oval at higher magnification. At 171x I could fairly well see within this glow the two rather compact cores of NGC7578 A/B, which were clearly separated from each other. The core of NGC7578 B (northeastern of NGC7578 A) appeared a bit brighter and larger. I didn't looked for the other members of course.
MODERATE

Arp 184 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC1961, IC2133, UGC3334, Arp184, H3.747
Type: GLX
Constellation: Cam
Coordinates: 05h42m04.78s / +69°22'42.17"
Brightness / Size: v11.0 mag / 4.5x3.1'
8" f/6, 100x, Bortle 4
Moderately faint with slightly brighter, round core. Shape hardly recognisable, appeared sometimes oval.
MODERATE

Arp 185 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC6217, UGC10470, Arp185, H1.280
Type: GLX
Constellation: UMi
Coordinates: 16h32m39.22s / +78°11'53.56"
Brightness / Size: v11.0 mag / 3.1x2.6'
8" f/6, 80x, Bortle 4
Obviously oval with slightly brighter core. Rather faint.
EASY

Arp 189 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC4651, UGC7901, Arp189, H2.12, Umbrella Galaxy
Type: GLX
Constellation: Com
Coordinates: 12h43m42.63s / +16°23'36.23"
Brightness / Size: v10.8 mag / 4.0x2.7'
8" f/6, 37x, Bortle 4-, NELM 5.8+, SQM-L 21.0
SQM-L 20.7: At 37x oval with much brighter center. At 80x very bright, slightly oval core area with much fainter outer regions.
EASY

Arp 199 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp199
Type: GLXGRP
Constellation: Boo
Coordinates: 14h17m04.00s / +36°34'30.00"

Group Members:
NGC5544 (UGC9142, H2.419) b13.2 mag 0.9x0.9'
NGC5545 (UGC9143) b14.0 mag 1.0x0.3' (58°)
8" f/6, 150x, Bortle 4, SQM-L 21.0
At first glance both galaxies appeared as elongated, evenly bright nebula. NGC5545 hardly separated from NGC5544 and appeared elongated. NGC5545 was roundish and also not easy to separate. Overall pretty faint.
MODERATE

Arp 205 (GLXGRP)

DSS
© DSS I - 10×10'
Name: Arp205
Type: GLXGRP
Constellation: UMa
Coordinates: 10h54m30.00s / +54°18'00.00"

Group Members:
NGC3448 (UGC6024, H1.233) v11.6 mag 5.6x1.7' (65°)
UGC6016 b17.0 mag 2.1x1.2' (30°)
The much more fainter companion UGC6016 is located southwest of NGC3448 and faintly visible on the DSS image.

8" f/6, 80x, Bortle 4, SQM-L 21.2
I only focused on the bright NGC3448 of course: At 37x just a small, elongated nebula. At 80x bright, very elongated, pretty thin and evenly bright.
EASY

Arp 212 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC7625, UGC12529, Arp212, H2.250
Type: GLX
Constellation: Peg
Coordinates: 23h20m30.13s / +17°13'32.16"
Brightness / Size: v12.1 mag / 1.6x1.4'
8" f/6, 171x, Bortle 4
Round with also roundish, brighter core.
EASY

Arp 213 (GLX)

DSS
© DSS II (blue) - 8×8'
Name: IC356, UGC2953, Arp213
Type: GLX
Constellation: Cam
Coordinates: 04h07m46.91s / +69°48'44.75"
Brightness / Size: v10.5 mag / 4.5x3.5'
8" f/6, 80x, Bortle 4, SQM-L 21.0
At 37x roundish and faint. At 80x slightly oval & condensed, barely visible with direct vision.
MODERATE

Arp 214 (GLX)

DSS
© DSS II (blue) - 12×12'
Name: NGC3718, UGC6524, Arp214, H1.221
Type: GLX
Constellation: UMa
Coordinates: 11h32m34.94s / +53°04'04.18"
Brightness / Size: v10.6 mag / 8.2x3.5'
8" f/6, 100x, Bortle 4
At 37x barely seen with direct vision. At 100x relatively large, diffuse, slightly oval. Obvious star pair SSW. Mottled with averted vision.
EASY

Arp 217 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3310, UGC5786, Arp217, H4.60
Type: GLX
Constellation: UMa
Coordinates: 10h38m45.86s / +53°30'11.89"
Brightness / Size: v10.6 mag / 3.1x2.4'
8" f/6, 37x, Bortle 4, SQM-L 21.2
At 37x quite compact, high surface brightness. Can be easily overlooked. At 80x the galaxy appears more like a planetary nebula, evenly bright, round with a well defined shape. At 200x the center appears a bit brighter. The galaxy fades toward north and northeast, whereby the brighter center seems to be slightly shifted southwards.
EASY

Arp 224 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3921, UGC6823, Arp224, H2.788
Type: GLX
Constellation: UMa
Coordinates: 11h51m06.86s / +55°04'43.38"
Brightness / Size: v12.4 mag / 2.1x1.3'
8" f/6, 100x, Bortle 4
Roundish with slightly brighter core.
MODERATE

Arp 225 (GLX)

DSS
© DSS II (blue) - 8×8'
Name: NGC2655, UGC4637, Arp225, H1.288
Type: GLX
Constellation: Cam
Coordinates: 08h55m37.73s / +78°13'23.10"
Brightness / Size: v10.1 mag / 4.9x4.1'
8" f/6, 37x, Bortle 4
Very bright core area with faint, round halo.
EASY

Arp 227 (GLXGRP)

DSS
© DSS II (blue) - 15×15'
Name: Arp227
Type: GLXGRP
Constellation: Psc
Coordinates: 01h19m58.00s / +03°25'00.00"

Group Members:
NGC470 (UGC858, H3.250) v11.8 mag 2.9x1.7'
NGC474 (UGC864, H3.251) v11.5 mag 6.1x5.0'
The eastern NGC474 already shows impressively concentric rings. On long time exposures very complex structures came to the fore.

8" f/6, 100x, Bortle 4-, NELM 5.7+, SQM-L 20.9
SQM-L in the target region: 20.6

NGC470: Already visible at 66x with direct vision. At 100x oval, slightly brighter core, otherwise evenly bright.

NGC474: Already visible at 66x with direct vision. At 100x roundish, appeared smaller than NGC470, but similarly bright with relatively bright, distinct, compact center.
EASY

Arp 229 (GLXGRP)

DSS
© DSS II (blue) - 12×12'
Name: Arp229
Type: GLXGRP
Constellation: Psc
Coordinates: 01h23m34.00s / +33°16'30.00"

Group Members:
NGC503 v14.1 mag 0.9x0.7'
NGC504 (UGC935) v13.0 mag 1.7x0.4'
NGC507 (UGC938, H3.159) v11.3 mag 3.1x3.1' (60°)
NGC508 (UGC939, H3.160) v13.1 mag 1.3x1.3'
8" f/6, 80x, Bortle 4
I only observed the bright NGC507: Relatively large & faint with brighter core.
MODERATE

Arp 232 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC2911, UGC5092, Arp232, H2.40
Type: GLX
Constellation: Leo
Coordinates: 09h33m46.10s / +10°09'09.33"
Brightness / Size: v11.5 mag / 4.0x3.1'
8" f/6, 100x, Bortle 4, NELM 6.0, SQM-L 21.0
SQM-L 20.6: Faint, relatively large with extended & well defined core area, otherwise more evenly bright.
MODERATE

Arp 234 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3738, UGC6565, Arp234, H2.783
Type: GLX
Constellation: UMa
Coordinates: 11h35m47.10s / +54°31'32.00"
Brightness / Size: v11.5 mag / 2.6x2.2'
8" f/6, 100x, Bortle 4
Already seen at 37x as small, roundish, faint nebula with averted vision. At 100x slightly oval with a bit brighter core.
EASY

Arp 235 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC14, UGC75, Arp235, H2.591
Type: GLX
Constellation: Peg
Coordinates: 00h08m46.42s / +15°48'55.90"
Brightness / Size: v12.1 mag / 2.8x2.1'
8" f/6, 100x, Bortle 4
Round to slightly oval nebula, brightening toward the middle.
MODERATE

Arp 264 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: NGC3104, UGC5414, Arp264, H4.48
Type: GLX
Constellation: LMi
Coordinates: 10h03m57.09s / +40°45'21.50"
Brightness / Size: v13.2 mag / 3.3x2.2'
8" f/6, 100x, Bortle 4, NELM 6.0, SQM-L 21.0
Oval, evenly bright, rather faint.
MODERATE

Arp 269 (GLXGRP)

DSS
© DSS II (blue) - 15×15'
Name: Arp269
Type: GLXGRP
Constellation: CVn
Coordinates: 12h30m36.00s / +41°40'00.00"

Group Members:
NGC4485 (UGC7648, H1.197) v11.9 mag 2.4x1.8' (15°)
NGC4490 (UGC7651, H1.198) v9.8 mag 6.3x3.1' (115°)
B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.3
I tried the bright NGC4490, but without success.

FAILED
4.5" f/8, 60x, Bortle 6, NELM 5.3, SQM-L 19.7
NGC4485: Quite small, roundish, evenly bright.

NGC4490: At 28x slightly elongated, evenly bright. At 60x a bit brighter center.

MODERATE
8" f/6, 37x, Bortle 4
NGC4485: At 37x well visible with averted vision as fairly small brightening. At 96x slightly oval.

NGC4490: Directly seen, elongated with obviously brighter, also elongated core area.
EASY

Arp 270 (GLXGRP)

DSS
© DSS II (blue) - 8×8'
Name: Arp270
Type: GLXGRP
Constellation: LMi
Coordinates: 10h49m53.00s / +32°59'00.00"

Group Members:
NGC3395 (UGC5931, H1.116) v11.8 mag 1.7x0.9' (50°)
NGC3396 (UGC5935, H1.117) v12.0 mag 2.9x0.9' (105°)
Bright Arp group of two interacting galaxies.

8" f/6, 80x, Bortle 4, NELM 6.0, SQM-L 21.0
At 37x both galaxies appeared together slightly elongated. From 80x well separated, but touching each other. NGC3395 appears brighter & larger than NGC3396. Both appeared oval, evenly bright and evident with averted vision. Further details were not seen.
EASY

Arp 271 (GLXGRP)

DSS
© DSS II (red) - 8×8'
Name: Arp271
Type: GLXGRP
Constellation: Vir
Coordinates: 14h03m26.00s / -06°03'00.00"

Group Members:
NGC5426 (UGCA380, H2.309) v12.1 mag 3.0x1.7' (173°)
NGC5427 (UGCA381, H2.310) v11.4 mag 2.9x2.2' (170°)
8" f/6, 80x, Bortle 4, SQM-L 21.2
SQM-L 20.2: At 37x both galaxies appeared together as oval brightening, whereby the brighter, northern NGC5427 was already visible as round, evenly bright, but faint nebula. NGC5426 was barely seen with averted vision. At 80x the galaxies were well separated. NGC5426 appeared slightly elongated and also evenly bright.
MODERATE

Arp 273 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp273
Type: GLXGRP
Constellation: And
Coordinates: 02h21m30.00s / +39°22'00.00"

Group Members:
UGC1810 v12.9 mag 2.0x1.4' (20°)
UGC1813 v14.2 mag 1.1x0.3' (80°)
Very nice, but faint Arp group.

8" f/6, 171x, Bortle 4, NELM 6.0, SQM-L 20.9
SQM-L 20.4: Only the bright UGC1810 was visible: At 100x extremely faint brightening. At 171x oval or slightly elongated, quite faint and evenly bright.
MODERATE

Arp 276 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp276
Type: GLXGRP
Constellation: Ari
Coordinates: 02h28m12.00s / +19°35'40.00"

Group Members:
IC1801 (UGC1936) v14.0 mag 1.4x0.6'
NGC935 (UGC1937) v12.8 mag 1.7x1.1'
8" f/6, 96x, Bortle 4, SQM-L 21.0
SQM-L 20.9: I only saw NGC935 for sure: At 96x obviously oval, center seemed to be somewhat brighter, otherwise rather evenly bright. At 171x I could saw a stellar brightening within the halo. Probably this was the 14.27m foreground star southeast of the core. The axial ratio was about 1:2 to 1:3. IC1801 wasn't clearly visible to me.
Even under better conditions (Bortle 3-, SQM-L at the zenith 21.3) IC1801 was not visible at 171x.
MODERATE

Arp 281 (GLXGRP)

DSS
© DSS II (red) - 20×20'
Name: Arp281
Type: GLXGRP
Constellation: CVn
Coordinates: 12h42m00.00s / +32°33'00.00"

Group Members:
NGC4627 (UGC7860, H2.659) v12.4 mag 2.2x1.7' (10°)
NGC4631 (UGC7865, H5.42, Whale Galaxy) v9.2 mag 15.5x2.7' (83°)
B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.3
I just tried the bright NGC4631.

FAILED
8" f/6, 37x, Bortle 4
NGC4627: Round, relatively small nebula, which can be easily seen at 96x with averted vision. A moderately faint star located between the centers of NGC4631 and NGC4627.

NGC4631: Large, very bright, very elongated with tapering ending on the west side. Broadening towards the brighter core, which is slightly shifted to the east along the longitudinal axis.
EASY

Arp 285 (GLXGRP)

DSS
© DSS II (blue) - 8×8'
Name: Arp285
Type: GLXGRP
Constellation: UMa
Coordinates: 09h24m10.00s / +49°13'30.00"

Group Members:
NGC2854 (UGC4995, H3.714) v13.0 mag 1.6x0.6' (45°)
NGC2856 (UGC4997, H3.713) v13.2 mag 1.1x0.5' (135°)
8" f/6, 150x, Bortle 4
Both galaxies are well visible with averted vision, slightly oval and at right angle to each other.
MODERATE

Arp 294 (GLXGRP)

DSS
© DSS II (blue) - 8×8'
Name: Arp294
Type: GLXGRP
Constellation: UMa
Coordinates: 11h39m42.00s / +31°55'30.00"

Group Members:
NGC3786 (UGC6621) v12.3 mag 2.1x1.1' (60°)
NGC3788 (UGC6623) v12.5 mag 2.1x0.7' (175°)
8" f/6, 96x, Bortle 4
Worthwhile! NGC3786 appears oval, NGC3788 more elongated & thin. Both galaxies are nearly perpendicular with almost touching endings.
MODERATE

Arp 301 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp301
Type: GLXGRP
Constellation: Leo
Coordinates: 11h09m54.00s / +24°15'40.00"

Group Members:
UGC6204 b14.5 mag 1.0x0.5' (177°)
UGC6207 b14.6 mag 1.5x0.3' (64°)
8" f/6, 150x, Bortle 3, SQM-L 21.4
SQM-L 21.0: Only the brighter UGC6204 was visible, which appeared pretty faint, roundish and barely condensed. UGC6207 was also not visible at 220x. But I was already pretty cold ;-)
MODERATE

Arp 307 (GLXGRP)

DSS
© DSS II (blue) - 8×8'
Name: Arp307
Type: GLXGRP
Constellation: Leo
Coordinates: 09h25m45.00s / +11°26'30.00"

Group Members:
NGC2872 (UGC5018, H2.57, H2.546) v11.9 mag 1.8x1.7'
NGC2873 (PGC26742) v15.4 mag 0.7x0.2' (125°)
NGC2874 (UGC5021, H2.58, H2.547) v12.5 mag 2.2x0.7' (43°)
Possibly these galaxies are not interacting.

8" f/6, 80x, Bortle 4, NELM 6.0, SQM-L 21.0
SQM-L 20.6 in the target region.

NGC2872: More apparent than the nearby NGC2874, round, slight brightening toward the middle.

NGC2873: Not tried of course ;-)

NGC2874: Well separated from the nearby NGC2872, oval, evenly bright. Evident with averted vision.
EASY

Arp 315 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp315
Type: GLXGRP
Constellation: Lyn
Coordinates: 09h19m45.00s / +33°44'42.00"

Group Members:
NGC2830 (UGC4941) v14.3 mag 1.2x0.3' (110°)
NGC2831 v13.4 mag 0.5x0.5'
NGC2832 (UGC4942, H1.113) v11.9 mag 3.0x2.0'
8" f/6, 100x, Bortle 5
Easy is only the bright NGC2832: barely seen with direct vision, roundish, diffuse, getting brighter toward the middle. The other two galaxies weren't visible even at 150x.
EASY

Arp 316 (GLXGRP)

DSS
© DSS II (blue) - 15×15'
Name: Arp316
Type: GLXGRP
Constellation: Leo
Coordinates: 10h18m05.00s / +21°52'00.00"

Group Members:
NGC3187 (UGC5556) v12.9 mag 3.6x1.7' (115°)
NGC3189 (NGC3190, UGC5559, H2.44) v11.2 mag 4.5x1.5' (118°)
NGC3193 (UGC5562, H2.45) v10.9 mag 2.9x2.8' (20°)
Very bright Arp group. Together with NGC3185 also known as Hickson 44. Worthwhile!

4.5" f/8, 75x, Bortle 7+
Only the two brightest members were visible. Both fairly well seen with averted vision. NGC3193 appeared roundish with brighter core, NGC3189 very elongated and nearly evenly bright, whereas only the brighter core was visible.

MODERATE
4.5" f/8, 75x, Bortle 4, NELM 6.0
The two brightest members were apparent with averted vision: NGC3193 appeared roundish with brighter core, NGC3189 very elongated with also elongated, brighter core and fainter, diffuse outer region.

EASY
8" f/6, 100x, Bortle 4
At 37x the two brightest members are clearly evident. NGC3179 is very elongated and shows at 100x an elongated, distinctly brighter core area. Dust lane wasn't seen, but galaxy appeared more sharply defined SW. NGC3193 is round with very bright, compact core. Much more difficult is NGC3187: Only at third attempt I was able to see it. At 171x very faint, very elongated, thin, evenly bright. Barely held with averted vision.
EASY

Arp 317 (GLXGRP)

DSS
© DSS II (blue) - 60×60'
Name: Arp317, Leo Triplet
Type: GLXGRP
Constellation: Leo
Coordinates: 11h19m50.00s / +13°18'00.00"

Group Members:
M65 (NGC3623, UGC6328) v9.2 mag 8.7x2.5' (174°)
M66 (NGC3627, UGC6346, Arp16) v8.9 mag 9.3x4.2' (173°)
NGC3628 (UGC6350, H5.8) v9.5 mag 13.1x3.1' (104°)
4.5" f/8, 28x, Bortle 7+
M65: Fairly thin, elongated, nearly evenly bright. Barely seen with direct vision. At 100x the core is brighter and seems also slightly elongated.

M66: A bit brighter than M65, oval with brighter core. Some apparent field stars at the edge of the galaxy. At 100x the oval core is evident.

NGC3628: Already seen at 28x as very faint nebula. At 75x fairly well seen with averted vision, faint, evenly bright, very elongated.

EASY
4.5" f/8, 75x, Bortle 4, NELM 6.0
I mainly focused on NGC3628, but M65 & M66 were very easily seen of course. NGC3628 appeared elongated, without distinct core, slight darkening toward the edge. With averted vision I think I saw in one moment the dust lane, but not for sure. Due to nearby street lamps I wasn't able to get fully dark-adapted.

EASY
8" f/6, 37x, Bortle 4
M65: Very elongated with brighter, compact core.

M66: Oval with distinct, bright and also oval core area.

NGC3628: At 37x obviously elongated, evenly bright, moderately faint. At 100x dust lane seen with averted vision, which runs slightly diagonal. A wonderful view!
EASY

Arp 319 (GLXGRP)

DSS
© DSS II (blue) - 7×7'
Name: HCG92, Arp319, Stephan's Quintet
Type: GLXGRP
Constellation: Peg
Coordinates: 22h35m57.50s / +33°57'36.00"

Group Members:
NGC7317 v13.6 mag 0.7x0.6' (150°)
NGC7318A (UGC12099) v13.4 mag 0.9x0.9' (90°)
NGC7318B (UGC12100) v13.2 mag 1.9x1.2' (120°)
NGC7319 (UGC12102) v13.5 mag 1.7x1.3' (148°)
NGC7320 (UGC12101) v12.6 mag 2.2x1.1' (132°)
4.5" f/8, 60x, Bortle 3, NELM 6.3+, SQM-L 21.3
A rather difficult group for 4.5 inch. Transparent sky is very important. At 60x I saw a brightening, that includes NGC7318A/B and NGC7320. Separating them was difficult. Only at 100x I could separate both for sure and they appeared as oval nebulas.

MODERATE
8" f/6, 150x, Bortle 4, SQM-L 21.0
Wonderful, but more fainter group near NGC7331. NGC7318A/B appeared at 80x as oval, evenly bright nebula with averted vision and is brightest member. At 218x I could separate the cores of both galaxies with averted vision. NGC7320 was also fairly easily seen at 80x with averted vision, oval, relatively faint. NGC7317 is located nearby a 13.4m star and appeared at 150x as a very compact brightening. NGC7319 is the faintest member in this group and was visible at 150x as an extremely faint glow.
MODERATE

Arp 320 (GLXGRP)

DSS
© DSS II (blue) - 8×8'
Name: HCG57, Arp320, Copeland's Septet
Type: GLXGRP
Constellation: Leo
Coordinates: 11h37m51.00s / +21°59'00.00"

Group Members:
NGC3745 b16.4 mag 0.6x0.4' (110°)
NGC3746 (UGC6597) b15.3 mag 1.1x0.5' (125°)
NGC3748 v14.8 mag 0.7x0.4' (140°)
NGC3750 v13.9 mag 0.8x0.7' (160°)
NGC3751 v14.3 mag 0.8x0.5' (5°)
NGC3753 (UGC6602) v13.6 mag 1.7x0.5' (120°)
NGC3754 b15.2 mag 0.4x0.3' (35°)
PGC36010 b17.4 mag 0.4x0.3' (20°)
8" f/6, 200x, Bortle 4, SQM-L 21.2
SQM-L in the target region about 21.0.

NGC3746: Roundish (?), faint. Brighter and larger than NGC3748.

NGC3748: Faint, roundish, pretty small.

NGC3750: Located southwest of NGC3753. Difficult to separate from brighter NGC3753. Just visible as very faint, roundish brightening. Held with averted vision.

NGC3751: Most southern member of the group. Unfortunately for some reason I didn't tried this one.

NGC3753: Slightly elongated, rather evenly bright, pretty faint. Brightest and largest member of the group.

NGC3754: Northeast close to NGC3753. At 220x & 220x absolutely nothing was seen.

MODERATE
16" f/4.5, 225x, Bortle 4, SQM-L 21.2
SQM-L in the target region about 21.0.

NGC3745: Round, compact brightening. Anything but evident at 225x.

NGC3746: Evident, slightly oval, getting a bit brighter towards the middle. Still visible with direct vision.

NGC3748: Small, round brightening. Well seen with averted vision.

NGC3750: Roundish, condensed brightening. Almost visible with direct vision.

NGC3751: Most southern member of the group. Unfortunately for some reason I didn't tried this one.

NGC3753: Obviously oval/slightly elongated, getting brighter towards the middle. Still visible with direct vision.

NGC3754: Ziemlich schwache, rundliche Aufhellung dicht an NGC3753.
EASY

Arp 322 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp322
Type: GLXGRP
Constellation: UMa
Coordinates: 11h32m40.00s / +52°56'40.00"

Group Members:
PGC35609 b16.5 mag 0.5x0.3' (170°)
PGC35615 b17.0 mag 0.5x0.3' (148°)
PGC35618 b15.9 mag 0.8x0.6' (72°)
UGC6527 (PGC35620) v14.6 mag 0.8x0.4' (53°)
The eastern, very elongated & thin galaxy PGC35631 is not part of Arp322, but forms Hickson 56 together with the other galaxies.

8" f/6, 200x, Bortle 3, NELM 6.5, SQM-L 21.6
Difficult. Nearly permanently held with averted vision as very compact, slightly elongated brightening, which is UGC6527 and maybe the two western galaxies PGC35615 and PGC35618. At 265x I thought to have seen two separate brightenings, but not for sure.
DIFFICULT

Arp 327 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: HCG34, Arp327
Type: GLXGRP
Constellation: Ori
Coordinates: 05h21m47.00s / +06°41'00.00"

Group Members:
NGC1875 v13.7 mag 0.8x0.7'
PGC17173 b18.3 mag 0.2x0.2'
PGC17175 b17.1 mag 0.4x0.2'
PGC17176 b17.4 mag 0.4x0.2'
Southeastern of the dominant NGC1875 are the three much more fainter members, which are arranged in a curved chain.

8" f/6, 218x, Bortle 5+, SQM-L 20.9
SQM-L 20.3: I've only tried the bright NGC1875 of course: Altitude of about 40°. Appeared round, almost evenly bright, difficult to hold with averted vision.
DIFFICULT

Arp 331 (GLXGRP)

DSS
© DSS II (blue) - 20×20'
Name: Arp331
Type: GLXGRP
Constellation: Psc
Coordinates: 01h07m15.00s / +32°24'00.00"

Group Members:
NGC373 v14.9 mag 0.4x0.4'
NGC375 (PGC3953) v14.5 mag 0.5x0.5'
NGC379 (UGC683, H2.215) v12.9 mag 1.4x0.7'
NGC380 (UGC682, H2.216) v12.5 mag 1.4x1.2' (80°)
NGC382 (UGC688) v13.2 mag 0.7x0.7'
NGC383 (UGC689, H2.217) v12.2 mag 2.0x1.7' (25°)
NGC384 (UGC686) v13.1 mag 1.1x0.8' (135°)
NGC385 (UGC687) v13.0 mag 1.1x1.0' (120°)
NGC386 (PGC3989) v14.3 mag 0.9x0.8'
NGC387 v15.5 mag 0.4x0.4'
NGC388 (PGC4005) v14.3 mag 0.6x0.3'
UGC679 (PGC3950) b16.6 mag 1.2x0.5'
Rich Arp group with many, partly faint galaxies.

8" f/6, 200x, Bortle 4
NGC379: Already seen at 80x as small brightening. 200x: oval shape.

NGC380: Barely seen at 80x as small nebular with averted vision. 200x: round shape.

NGC383: Brightest member. At 80x round with slightly brighter core. Well visible with averted vision.

NGC384: Very small, compact. Intermittently seen with averted vision. It took a while to see this faint galaxy. Already glimpsed while observing nearby NGC385.

NGC385: Small, compact. Intermittently seen with averted vision. A bit brighter than NGC384.
MODERATE

Arp 336 (GLX)

DSS
© DSS II (red) - 5×5'
Name: NGC2685, UGC4666, Arp336, Helix Galaxy
Type: GLX, SY2
Constellation: UMa
Coordinates: 08h55m34.75s / +58°44'03.87"
Brightness / Size: v11.3 mag / 4.6x2.1'
8" f/6, 80x, Bortle 4
Barely seen with direct vision. Slightly elongated with bright, round and compact core area.
EASY

Arp 337 (GLX)

DSS
© DSS II (blue) - 12×12'
Name: M82, NGC3034, UGC5322, Arp337, H4.79
Group: M81 Group, Virgo Supercluster
Type: GLX
Constellation: UMa
Coordinates: 09h55m52.43s / +69°40'46.93"
Brightness / Size: v8.4 mag / 11.2x4.3'
B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Elongated, thin, evenly bright. At the limit of perception.

DIFFICULT
B 40mm, 8x, Bortle 5+, NELM 5.7+, SQM-L 20.9
Very elongated, thin, evenly bright. Not particularly evident. Only well visible with averted vision.

EASY
70mm f/5.7, 12x, Bortle 4, SQM-L 21.3
At 12x easily visible as elongated nebula. At 111x the dark lanes were pretty evident with averted vision.

EASY
80mm f/6.25, 25x, Bortle 6, NELM 5.0, SQM-L 19.4
At 25x elongated, fairly thin, nearly evenly bright. Barely visible with direct vision. At 62x I could glimpse at least 2 dark lanes.

EASY
4.5" f/8, 28x
Observation from outskirts at almost full moon with a angular distance of 60° from M82! At 28x barely seen with direct vision, very elongated, fairly thin, nearly evenly bright. Cigar-shaped. At 72x 2-3 dark lanes visible with averted vision, most obvious on the eastern edge.

EASY
120mm f/5, 18x, NELM 5.0
Observation at full moon: At 18x thin, elongated, evenly bright. At 75x 2 dark lanes apparent with averted vision.

EASY
8" f/6, 37x, Bortle 4
Very bright, cigar-shaped, slight brightening toward the middle. At 100x up to three dark lanes across the width are evident with averted vision. The dark lane on the east side is most obvious. Awesome!
EASY