Stephan's Quintet (Hickson 92) Galaxies in Pegasus

Center of field at approximately: RA 22 hours 36 minutes 01 seconds, Dec +33 degrees 57 minutes 56 seconds

Size: NGC 7317 = 0.8' x 0.7', NGC 7318A = 0.8' x 0.6', NGC 7318B = 1.4' x 0.9', NGC 7319 = 1.5' x 1.1', NGC 7320 = 2.3' x 1.1', NGC 7320C = 0.6' x 0.5'

Magnitude: N 7317 = 13.6 visual, N 7318A = 14.3 blue, N 7318B = 13.9 blue, N 7319 = 13.1 visual, NGC 7320 = 13.2 blue, N 7320C = 16.7 blue

Class: N 7317 = E4, N 7318A = E2 pec, N 7318B = SB(s)bc pec, N 7319 = SB(s)bc pec, N 7320 = SA(s)d, N 7320C = (R)SAB(s)0/a

North is up

West to the right

Telescope:

14.5" f5 Newtonian reflector

Camera:

  ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 620 minutes (62 x 10 minute subs), 09/18/19/20/21/2012; seeing 2.9-4.0 FWHM per CCDStack

Processing:

CCDStack 2.66.4490.32361, Photoshop CS5.1

Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes: Stephan's Quintet is about 30 arc minutes SSW from NGC 7331.

See marked image here ... designations are from my charting program (Megastar v5.0.13). "Anon 4" from CDS

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7317
NGC 7317 = MCG +06-49-038 = CGCG 514-060 = Arp 319 = HCG 92e = Stephan's Quintet
22 35 51.8 +33 56 42
V = 13.6;  Size 1.1x1.1;  SB = 13.8

18" (6/25/04): faint, very small, round, ~20" diameter.  Situated just off the 
SE side of a mag 13 star which detracts from viewing.  This star is collinear 
with two mag 13.5 stars 0.7' NE and 1.7' SE with a mag 14.5 star just off this 
line.  These and a few additional faint stars near or attached to galaxies in 
the group (N7320) contribute to the challenge and fascination of these five 
galaxies.

17.5" (9/14/85): fourth brightest of five in Stephan's quintet.  Fairly faint, 
small, round, brighter core, easy with direct vision.  A mag 13 star is at the 
NW edge just 16" from the center which confuses the observation.  The 
interacting pair N7318A and N7318B is 1.6' NE and N7320 is 2.5' E.

13" (9/29/84): very faint, small, round.  A star is at the NW edge.  Second 
faintest in Stephan's quintet.

13" (8/23/84): very faint, small, round, visible without averted vision.

13" (8/5/83): extremely faint, very small, round, close following a star, 
requires averted vision.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 7318 (A-B; NGC / IC Project lists the two galaxies as UGC 12099 and UGC 12100 ... see data from CDS)
NGC 7318 = UGC 12099 = MCG +06-49-039 = CGCG 514-061 = Arp 319 = HCG 92d = VV 
288c = NPM1G +33.0464 = (R)N7318A = Stephan's Quintet
22 35 56.7 +33 57 56
V = 13.4;  Size 0.8x0.8;  SB = 13.0

18" (6/25/04): this is the brighter, western component of a double system with 
N7318B.  Appears fairly faint, slightly elongated E-W, sharply concentrated with 
a bright stellar or quasi-stellar nucleus.

17.5" (9/14/85): western member of a double galaxy with N7318B in Stephan's 
quintet.  Moderately bright, elongated ~E-W.  This double system appears as two 
stellar nuclei within a common elongated halo.  The three other members are 
N7317 1.6' SW, N7320 1.9' SE and N7319 1.5' NE.

13" (9/29/84): faint, elongated, two stellar nuclei visible.

8" (8/28/81): extremely faint, small.  This double galaxy appears as a single 
object.

6" (6/25/04): extremely faint, glimpsed intermittently at 105x and 140x along 
with N7320 using a 6" mask.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 7319
NGC 7319 = UGC 12102 = MCG +06-49-041 = CGCG 514-064 = VV 288b = Ho 792b = NPM1G 
+33.0466  = HCG 92c = Arp 319 = Stephan's Quintet
22 36 03.5 +33 58 33
V = 13.1;  Size 1.7x1.3;  SB = 13.8

18" (7/20/04): at 323x appears a very faint low surface brightness glow, small, 
elongated 3:2 or 2:1 NW-SE, ~40"x25", very weak concentration.  Three 15-16 
magnitude stars are very near.  This galaxy is the faintest in  Stephan's 
Quintet.

18" (6/25/04): very faint, small, round, low surface brightness, slightly 
elongated, ~25"x20", very small slightly brighter core.  Faintest in Stephan's 
quintet.

17.5" (9/14/85): faintest in Stephan's quintet.  Faint, fairly small, elongated 
NW-SE, very low surface brightness with only a very weak concentration.  Located 
1.7' N of N7320 and 1.5' NE of the double system N7318A/B.

13" (7/27/84): extremely faint, fairly small, requires averted.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 7320
NGC 7320 = UGC 12101 = MCG +06-49-042 = CGCG 514-063 = VV 288a = Ho 792a = HCG 
92a = LGG 459-002 = Stephan's Quintet
22 36 03.4 +33 56 53
V = 12.6;  Size 2.2x1.1;  SB = 13.5;  PA = 132d

18" (6/25/04): fairly faint, fairly small, elongated 3:2 NW-SE, ~50"x30".  A mag 
14 star is embedded on the SE portion of the halo, just 15" from the center.  
Comparable brightness to the combined glow of N7318A/B.  The Quintet was viewed 
at 257x and 300x.

17.5" (9/14/85): brightest in Stephan's quintet consisting of five galaxies 
within a 4' diameter circle.  Moderately bright, moderately large, brighter 
core, elongated 5:2 NW-SE.  A mag 14.5 star is at the SE side 15" from the 
center.  N7317 lies 2.5' W, N7318 pair is 1.7' NW and N7319 1.7' N.  Located 30' 
SSW of N7331.

13": faint, elongated NW-SE.

8": extremely faint, small.

6" (6/25/04): marginal but definitely glimpsed at moments with a 6" mask at 115x 
and 140x.

- by Steve Gottlieb
NGC / IC Project does not list "NGC 7320C" as part of Stephan's Quintet ... see this data from the CDS