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
14.5" f5 Newtonian reflector
ST-8XME, self-guided, binned 1x1, temp -10c & -15c, camera control MaxIm DL 4.56
Lumicon Red filter, 440 minutes (44 x 10 minute subs), 09/13/14/15/2012; seeing 3.5-4.2 FWHM per CCDStack
CCDStack 2.66.4490.32361, Photoshop CS5.1
Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)
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 GottliebHistorical 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 GottliebHistorical 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 GottliebHistorical 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 GottliebContemporary 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 GottliebContemporary 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