NGC 7331 (UGC 12113) Galaxy in Pegasus

Located at: RA 22 hours 37 minutes 05 seconds, Dec +34 degrees 25 minutes 00 seconds

Size: 14.5' x 3.7' Magnitude: 9.4 visual Class: SA(s)b HII

North is up

West to the right

Telescope:

14.5" f5 Newtonian reflector

Camera:

  ST-8XME, self-guided, binned 1x1, temp -10c & -15c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 440 minutes (44 x 10 minute subs), 09/13/14/15/2012; seeing 3.5-4.2 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: Still testing the 14.5" ... see the 8" version.

NGC 7331 is about 30 arc minutes NNE from Stephan's Quintet.

Sometimes called the "Deer Lick" group. There are four small NGC galaxies due east (left) of NGC 7331, and a smattering of other small galaxies throughout the field. First NGC galaxy to the east is NGC 7335 (1.7'x0.7', mag 14.4b, Cl:SA(rs)0+), to the northeast (and going counterclockwise) is NGC 7336 (1.1'x0.4', mag 16.8, Cl:S), furthest east is NGC 7340 (1.1'x0.7', mag 14.7p, Cl:E?), and back west towards NGC 7331 is NGC 7337 (1.3'x0.9', mag 15.2p, Cl:SB(rs)b). See this marked image.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7331
NGC 7331 = UGC 12113 = MCG +06-49-045 = CGCG 514-068 = Ho 795a = LGG 459-003
22 37 04.1 +34 24 56
V = 9.5;  Size 10.5x3.7;  SB = 13.3;  PA = 171d

13.1" (7/27/84): very bright, very elongated 3:1 NNW-SSE, 9'x2.5', very bright 
elongated core, substellar nucleus.  The west side has a sharper edge due to 
dust.  Four companions are close following with the brightest three N7335 3.5' 
ENE, N7337 5.2' SE, N7336 5.3' NE and N7340 8.1' E of center.  Stephan's Quintet 
lies 30' SSW.

8" (8/28/81): very bright, large, nucleus bulge, very elongated.  Two extremely 
faint companions to the E are just visible.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 7331
NGC 7331.  See NGC 7327 and NGC 7335. - Dr. Harold G. Corwin, Jr.
Contemporary Visual Observation(s) for NGC 7327
NGC 7327 = ?
22 36 57.3 +34 28 02

17.5": this number refers to one of the several nonexistent NGC entries in the 
N7331 vicinity.  A possible candidate suggested by Harold Corwin is a mag 13 
star near the tip of the northern extension of N7331.  This single star appeared 
stellar, although it seems plausible that it might look slightly nebulous due to 
the faint background haze of the galaxy.  Other fainter nearby stars may instead 
apply to N7327.

Discovered by Tempel.  His original description is vague: "preceding the 
northern end of N7331".  There are no galaxies or double stars nearby, so he may 
have mistaken a single faint star.  Corwin suggests the mag 13 star at 22 36 
57.3 +34 28 02 (2000) as a reasonable candidate in NGCBUGS.  Another possibility 
is the compact galaxy with a star superimposed which RNGC identifies as NGC 
7325, although this is 4' NW of Tempel's positoin.  Unfortunately, Tempel didn't 
leave any additional clues as to the identification of N7327.  See my article on 
N7331 in Deep Sky, Fall 1986 and NGCBUGS.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 7327
NGC 7327, unfortunately, is one of those "....many novae merely alluded to in 
(Tempel's) published notes."  A rough translation by me of what Tempel has to 
say about N7327 in his published article doesn't really help much, but here it
is:  "Of my eight companions [to N7331], Lord Rosse has still not seen two;
one [N7338, which see] is located in the middle of the four brighter 
companions following, closer to the two southern objects; while the eighth
[N7327] precedes the northern end of the spindle."  That is it.

Tempel gives no accurate positions or offsets, so all we have are the numbers
published in the NGC to lead us to the area.  There is nothing in the 
immediate vicinity but stars.  However, about 4 arcmin northwest is a compact
galaxy with a star superposed (I think the object is the one that RNGC 
incorrectly chose for N7325, which see) that might have been within range of 
Tempel's telescope.  I've chosen it as a possibility for his object.  

However, there are four stars scattered around the NGC position.  The 
brightest is 1.5 arcmin southwest, the faintest is 1.1 arcmin north-northeast,
and the intermediate stars are 0.9 arcmin southeast and 0.9 arcmin east-
northeast.  One of these is taken to be N7327 in RC1, MCG, and RNGC.  Given
that so many of Tempel's new "nebulae" in other fields (see, e.g. NGC 4322 and 
NGC 4768/9) are stars or asterisms, it is actually more likely that one of
these stars is his object than the galaxy that I give in the table.  But which
one?  So, I put them all in the table with question marks everywhere.
 - Dr. Harold G. Corwin, Jr.

Contemporary Visual Observation(s) for NGC 7335

NGC 7335 = UGC 12116 = MCG +06-49-047 = CGCG 514-069 = Ho 795c = NPM1G +34.0449
22 37 19.4 +34 26 52
V = 13.3;  Size 1.3x0.6;  SB = 12.9;  PA = 151d

18" (7/19/04): at 225x appears fairly faint, fairly small, elongated 5:2 NNW-
SSE, contains a bright core which increases to a faint stellar nucleus, 
~0.8'x0.35', though increases in size with averted vision to 1.0'x0.4'.  
Brightest of 4 companions on the following side of N7331.

17.5" (8/27/87): fairly faint, bright core, elongated 5:2 NNW-SSE, small bright 
core.  This is the brightest and largest of the four following companions of 
N7331 located 3.5' ENE of center.  A mag 14 star is 1.3' NE.  Extremely faint 
N7336 is 2.1' NNE.

17.5" (9/14/85): fairly faint, bright core, very elongated NNW-SSE.

13" (9/29/84): easily the brightest and largest of the companions to N7331.  
Fairly faint but easily visible with direct vision at 220x, gradually increases 
to center, elongated NNW-SSE.

13" (7/27/84): fairly faint, elongated NNW-SSE, broad concentration.  Located 
3.6' E of the center of N7331.  Extremely faint N7336 is 2' NNE.

8" (8/28/81): extremely faint, very small, requires averted.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 7335, 7336, 7340 and 7337 (same notes for all)
NGC 7335, 7336, 7337, and 7340 are correctly identified by just about 
everybody except the Lick astronomers who, as Steve Gottlieb notes, have 
thoroughly mangled the identifications in the area of NGC 7331.
 - Dr. Harold G. Corwin, Jr.

Contemporary Visual Observation(s) for NGC 7336

NGC 7336 = MCG +06-49-049 = Ho 795j = NPM1G +34.0450
22 37 21.9 +34 28 54
V = 15.8;  Size 0.5x0.4;  SB = 13.9

18" (7/19/04): at 225x appears extremely faint, very small, roundish.  At times 
only a 10" core was visible but with concentrated viewing an extended halo was 
visible increasing the size to 20"x10".  Located 2' NNE of N7335 and faintest of 
the quartet.

17.5" (8/12/88): very faint, very small, elongated, visible steadily.  Located 
1' NNW of a mag 14 star.

17.5" (8/27/87): faintest of quartet can just be held continuously with averted 
vision, elongated ~N-S.

17.5" (9/14/85): very faint, very small, slightly elongated.  Just visible with 
constant direct vision at 200x (10mm Clave). A mag 14 star is 1.0' SSE of 
center.  This is the faintest of four companions of N7331 and is located 2.1' 
NNE of N7335.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 7340
NGC 7340 = MCG +06-49-052 = CGCG 514-075 = Ho 795e = NPM1G +34.0452
22 37 44.2 +34 24 36
V = 13.7;  Size 0.9x0.6;  SB = 12.9

18" (7/19/04): at 322x appears fairly faint, small, round, 25"-30" diameter, 
broad concentration to a brighter core.  This is the second most prominent 
galaxy of the quartet following N7331.

17.5" (8/27/87): fairly faint, small, round, bright core, stellar nucleus.  This 
is the last of four galaxies following N7331 and lies 8.1' E of center.  Nearby 
are N7337 4.2' SW and N7335 5.6' NW.  Collinear with two 10 stars 1.8' NNW and 
3.6' NNW.

17.5" (9/14/85): fairly faint, small, round, bright core.

13" (9/29/84): faint, small, round, bright core.  Second brightest of four faint 
companions of N7331.

8" (8/28/81): extremely faint, very small, requires averted.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 7337
NGC 7337 = UGC 12120 = MCG +06-49-050 = CGCG 514-071 = Ho 795b
22 37 26.6 +34 22 27
V = 14.4;  Size 1.1x0.9;  SB = 14.3

18" (7/19/04): at 322x appears faint, very small, round, ~20" diameter.  The 
observation is confused by a mag 14 star which is attached on the SE side and 
the galaxy appears to bulge out from the star towards the NW.

17.5" (8/27/87): fairly faint, small, slightly elongated.  A mag 14-14.5 star 
attached at the SE end just 9" from the center confuses the observation as the 
galaxy appears like a close double.  Located 5.2' SE of the center of N7331 in a 
group of four faint companions.

17.5" (9/14/85): faint, very small, round, star attached at SE end.

13" (9/29/84): very faint, very small, round.  A mag 14 star is superimposed at 
the SE side.  This is the third faintest of the four companions to N7331 and is 
located 5' SE of the center of N7331.  N7340 is 4' NE.

- by Steve Gottlieb