Observations - Hints


Worthwhile Regions of the Sky




Last update: 2017-07-26


- Hickson Compact Groups (Peg) -

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

Hickson 92 (GLXGRP)

© DSS II (blue) - 7×7'
Name: HCG92, Arp319, Stephan's Quintet
Constellation: Peg
Coordinates: 22h35m57.50s / +33°57'36.0"

Group members:
NGC7317 v13.6 mag 0.7×0.6'
NGC7318A (UGC12099) v13.4 mag 0.9×0.9'
NGC7318B (UGC12100) v13.2 mag 1.9×1.2'
NGC7319 (UGC12102) v13.5 mag 1.7×1.3'
NGC7320 (UGC12101) v12.6 mag 2.2×1.1'
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 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.

Hickson 93 (GLXGRP)

© DSS II (blue) - 12×12'
Name: HCG93
Constellation: Peg
Coordinates: 23h15m22.00s / +18°59'30.0"

Group members:
NGC7547 (UGC12453) v13.7 mag 1.1×0.5'
NGC7549 (UGC12457) v13.0 mag 2.8×0.7'
NGC7550 (UGC12456, H3.181) v12.2 mag 1.4×1.2'
NGC7553 v14.4 mag 0.7×0.6'
NGC7558 v14.9 mag 0.4×0.4'
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°43'00.0"

Group members:
NGC7578A (UGC12477) v13.9 mag 0.7×0.6'
NGC7578B (UGC12478) v14.0 mag 1.7×1.2'
NGC7578C (PGC70936) b16.5 mag 0.3×0.2'
PGC70937 b18.1 mag 0.6×0.2'
PGC70939 b18.2 mag 0.3×0.2'
PGC70941 b18.6 mag 0.2×0.2'
PGC70943 b16.4 mag 0.8×0.3'
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°30'00.0"

Group members:
MCG+1-59-46 (PGC71074) b16.1 mag 0.8×0.2'
MCG+1-59-48 (PGC71080) v15.2 mag 0.8×0.3'
NGC7609 v14.2 mag 1.3×1.1'
PGC71077 v16.1 mag 0.7×0.4'
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.