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Last update: 2018-04-11

VdS FG

- Galaxies of the Arp Catalogue (CVn) -

And (4) Cep (3) CVn (5) Lep (1) Peg (11) Tri (1)
Ari (3) Cet (1) Dra (1) LMi (4) Per (1) UMa (17)
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 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 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
120mm f/5, 66x, Bortle 6-, SQM-L 19.1
At 23x both galaxy visible and separate, whereby NGC 5195 is noticeable fainter. At 66x Messier 51 showed a compact, brighter nucleus and a round, fainter, evenly bright halo. NGC 5195 can be at 66x well seen with averted vision, oval with slightly towards south shifted, brighter core.

--> Sketch

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 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
120mm f/5, 48x, Bortle 4, SQM-L 21.3
NGC4485: At 23x not very evident, slightly oval, evenly bright. At 48x conspicuous and getting slightly brighter towards the middle.

NGC4490: At 23x very evident, oval, slightly condensed and barely visible with direct vision. At 48x easily seen with direct vision.

EASY
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 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