Observations - Hints


Worthwhile Regions of the Sky




Last update: 2018-07-07


- Hickson Compact Groups -

Aqr (1) Com (1) Leo (3) Peg (4)
Cnc (1) CVn (1) Ori (1) UMa (1)

Hickson 34 (GLXGRP)

© DSS II (blue) - 5×5'
Name: HCG34, Arp327
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, 216x, 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.

Hickson 37 (GLXGRP)

© DSS II (blue) - 5×5'
Name: HCG37
Constellation: Cnc
Coordinates: 09h13m37.00s / +30°00'00.00"

Group Members:
MCG+5-22-16 (PGC26005, PGC26009) b16.1 mag 0.4x0.3'
MCG+5-22-20 (PGC26004) b15.8 mag 0.4x0.3'
NGC2783A (UGC4859, H3.295) v12.6 mag 2.2x1.5' (168°)
NGC2783B (UGC4856) v14.3 mag 1.7x0.2' (77°)
8" f/6, 200x, Bortle 4-, SQM-L 21.0
Limiting magnitude in the target region at least 5.4 mag. I only observed the two brightest members.

NGC2783A: Already visible at 80x with averted vision. Appeared roundish, quite well condensed, rather small.

NGC2783B: Appeared more as an almost stellar brightening, in few moments also elongated. Permanently seen with averted vision but pretty faint.

Hickson 44 (GLXGRP)

© DSS II (blue) - 20×20'
Name: HCG44
Constellation: Leo
Coordinates: 10h17m59.00s / +21°47'18.00"

Group Members:
NGC3185 (UGC5554) v12.2 mag 2.1x1.4' (130°)
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 Hickson group. 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.

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. NGC3185 perceptible with averted vision as fairly faint, roundish, evenly bright nebula.

8" f/6, 100x, Bortle 4
At 37x the two brightest members (NGC3189 & NGC3193) 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. NGC3185 appears at 37x as a relatively small, faint brightening, at 100x evenly bright and slightly oval. Most 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.

Hickson 53 (GLXGRP)

© DSS II (blue) - 10×10'
Name: HCG53
Constellation: Leo
Coordinates: 11h29m00.00s / +20°46'30.00"

Group Members:
NGC3697 (NGC3697A, UGC6479, PGC35347) b14.1 mag 2.4x0.7' (93°)
NGC3697B (PGC35355) b15.3 mag 0.7x0.5' (170°)
NGC3697C (PGC35360) b15.3 mag 0.5x0.4' (120°)
PGC35381 b16.8 mag 0.5x0.2' (90°)
8" f/6, 150x, Bortle 3, SQM-L 21.4
SQM-L in the target region about 21.0.

NGC3697A: Brightest member of the group. Elongated, evenly bright & wide.

NGC3697B: Roundish, slightly condensed. Overall pretty faint. Located northwest near NGC3697C.

NGC3697C: Unfortunately not seen, although the northwestern NGC3697B was feasible.

Hickson 56 (GLXGRP)

© DSS II (blue) - 5×5'
Name: HCG56
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°)
PGC35631 b16.0 mag 1.0x0.2' (172°)
UGC6527 (PGC35620) v14.6 mag 0.8x0.4' (53°)
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.

Hickson 57 (GLXGRP)

© DSS II (blue) - 8×8'
Name: HCG57, Arp320, Copeland's Septet
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.

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.

Hickson 61 (GLXGRP)

© DSS II (blue) - 8×8'
Name: HCG61, The Box
Constellation: Com
Coordinates: 12h12m22.00s / +29°11'09.00"

Group Members:
NGC4169 (UGC7202, H3.358) v12.3 mag 1.8x0.9' (150°)
NGC4173 (UGC7204, H2.372) v12.7 mag 5.0x0.7' (128°)
NGC4174 (UGC7206, H3.359) v13.6 mag 0.8x0.3' (50°)
NGC4175 (UGC7211, H3.360) v13.4 mag 1.8x0.4' (130°)
120mm f/5, 48x, Bortle 4, SQM-L 21.3
I only saw the brightest member NGC4169. At 48x still compact, at 85x roundish to slightly oval, condensed.

8" f/6, 100x, Bortle 3, NELM 6.3, SQM-L 21.5
All four members were visible. NGC4169 is brightest member and apparent with direct vision. Appeared as oval nebula with brighter core. NGC4174 & NGC4175 appeared elongated, whereas NGC4174 is fairly compact. Both galaxies well seen with averted vision. NGC4173 held with averted vision, very thin & elongated, but quite faint and evenly bright. An awesome group of galaxies, especially when you see all members at once!

8" f/6, 150x, Bortle 4
NGC4169 most easy, which can be seen with direct vision as an oval nebula with much brighter core. Smallest and second brightest regarding to high surface brightness is NGC4174: relatively small, elongated, apparent with averted vision. More difficult is NGC4175: Permanently held with averted vision as elongated nebula. Largest, but very faint NGC4173 not seen.

Hickson 68 (GLXGRP)

© DSS II (blue) - 13×13'
Name: HCG68
Constellation: CVn
Coordinates: 13h53m40.00s / +40°19'00.00"

Group Members:
NGC5350 (UGC8810, H2.713) v11.3 mag 3.2x2.6' (40°)
NGC5353 (UGC8813, H2.714) v11.0 mag 2.8x1.9' (145°)
NGC5354 (UGC8814, H2.715) v11.4 mag 2.2x2.0'
NGC5355 (UGC8819, H3.699) v13.1 mag 1.2x0.7' (5°)
NGC5358 (UGC8826) v13.6 mag 1.1x0.3' (138°)
Very bright Hickson Group. The brightest members should be well visible also with smaller aperture.

8" f/6, 37x, Bortle 4, NELM 6.0
At 37x the two brightest members NGC5353 and NGC5354 are evident with averted vision and clearly separated from each other. At 100x NGC5353 appeared slightly oval with bright, distinct core, whereas NGC5354 appeared more roundish and evenly bright. Also well visible is NGC5350, which is largest member of the group. Already visible at 37x with averted vision as relatively large, roundish, rather faint brightening. At 100x the center was somewhat brighter. The much more fainter NGC5355 was well seen at 150x with averted vision as slightly elongated brightening. The faintest member is NGC5358: At 150x I could barely see this galaxy with averted vision as very compact, diffuse brightening, which was probably only the bright core area.

Hickson 88 (GLXGRP)

© DSS II (red) - 12×12'
Name: HCG88
Constellation: Aqr
Coordinates: 20h52m24.00s / -05°44'59.00"

Group Members:
MCG-1-53-14 (PGC65612) b15.0 mag 1.1x0.3' (70°)
NGC6975 (NGC6976) v14.0 mag 0.8x0.7' (5°)
NGC6977 v13.2 mag 1.3x0.9'
NGC6978 v13.3 mag 1.5x0.7' (125°)
8" f/6, 171x, Bortle 4, NELM 6.0+, SQM-L 21.1
SQM-L 20.6, Alt ca. 32°: Due to its low altitude this galaxy group can be a real challenge for 8 inch. Only the two brightest members were visible, which appeared similar bright. NGC6978 is the largest one and appeared elongated and almost evenly bright at 171x. However this galaxy wasn't evident at the first glance, but afterwards easily held with averted vision. NGC6977 is similarly difficult, somewhat fainter, roundish and evenly bright.

33" f/3.9, 194x, Bortle 4, NELM 6.0+, SQM-L 21.1
SQM-L 20.6, Alt ca. 32°: The two brightest members were obvious and visible with direct vision. NGC6978 was obviously elongated with a brighter core, NGC6977 was smaller, roundish to slightly oval with somewhat brighter core. Between these two galaxies a star was apparent. NGC6975 was fainter and only visible with averted vision as roundish nebula with also somewhat brighter core. All three galaxies are arranged in a line with almost same distances. A nice view! The faintest member (PGC65612) wasn't visible due to problems with dew on the secondary mirror. With large aperture a very nice Hickson Group.

Hickson 92 (GLXGRP)

© DSS II (blue) - 7×7'
Name: HCG92, Arp319, Stephan's Quintet
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.

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 214x 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.

Hickson 93 (GLXGRP)

© DSS II (blue) - 12×12'
Name: HCG93
Constellation: Peg
Coordinates: 23h15m22.00s / +18°59'30.00"

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°)
NGC7553 v14.4 mag 0.7x0.6' (165°)
NGC7558 v14.9 mag 0.4x0.4' (65°)
8" f/6, 96x, Bortle 4-, NELM 5.7+, SQM-L 20.8
SQM-L 20.6: Largest and brightest member is NGC7550, which was barely visible with direct vision at 96x. This galaxy appeared roundish with slightly brighter center, otherwise rather evenly bright. At 133x the core appeared very compact. Second brightest member is NGC7549, which appeared at 96x roundish, at 133x partly slightly oval. Overall quite faint, but well perceptible with averted vision. The slightly fainter NGC7547 was seen at 96x only as rather compact brightening, at 133x evenly bright. Probably I only saw the brighter core area. The two faintest members 7553 & 7558 I didn't tried until now.

Hickson 94 (GLXGRP)

© DSS II (blue) - 6×6'
Name: HCG94
Constellation: Peg
Coordinates: 23h17m16.00s / +18°43'00.00"

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'
PGC70939 b18.2 mag 0.3x0.2'
PGC70941 b18.6 mag 0.2x0.2'
PGC70943 b16.4 mag 0.8x0.3'
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, but the third brightest one (PGC70943) might be worth trying ;-)

Hickson 95 (GLXGRP)

© DSS II (blue) - 5×5'
Name: HCG95, Arp150
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.