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Old 23-11-2010, 07:49 AM
SteveG (Steve)
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Observation Report w/76cm Nov 2010 (part II)

NGC 25, 28, 31 and 37 are the four brightest members of Abell Galaxy Cluster (AGC) 2731, also in Phoenix near the Tucana border. AGC 2731 is part of a chain of rich galaxy clusters that form the Phoenix Supercluster along with AGC 2806, 2870 and 2877. The four NGC galaxies form a distinctive string oriented SW to NE, and are surrounded by several faint galaxies. I logged a total of 9 members, most of the fainter ones having 2MASX designations from the 2-Micron All Sky Survey.

NGC 25
00 09 59.4 -57 01 14
V = 13.0; Size 1.4'x0.8'; Surf Br = 14.0; PA = 85d
30" (429x): Fairly bright, moderately large, elongated 3:2 E-W, 0.8'x0.5', fairly well concentrated with a brighter core. Flanked by a mag 15 star 0.6' NE and a similar star 1' S. Located 2.7' SE of a mag 10.5 star. NGC 28 lies 4' NE, NGC 31 5.7' ENE, 2MASX J00101851-5700419 2.5' ENE and Fairall 1 3.0' SSE.

Fairall 1 = PGC 394344
00 10 04.3 -57 04 09
Size 0.5'x0.3'; PA = 65d
Immediately noticed 3' SSE of NGC 25 at the southwest end of the cluster as a faint hazy spot, very small, round, ~15" diameter, no details.

2MASX J00101852-5706369
00 10 18.5 -57 06 36
Size 0.8'x0.6'; PA = 106d
Fairly faint, fairly small, elongated 3:2, diffuse appearance with a relatively even surface brightness. Located 6' SSE of NGC 25 on the SW side of the cluster.

NGC 28
00 10 25.2 -56 59 21
V = 13.8; Size 0.8'x0.6'; Surf Br = 12.9
30" (429x): moderately bright, fairly small, irregularly round, 30"x25", fairly high surface brightness, steadily increases to a very small bright core and stellar nucleus. Located in the core of the cluster with NGC 31 1.8' E, NGC 25 4' SW, and PGC 394784 2.4' SSE.

2MASX J00102856-5701389
00 10 28.6 -57 01 39
Size 0.4'x0.35'
Picked up 2.4' SSE of N25 and 2.8' SW of N31. A mag 16 star lies 39" W. This galaxy appeared faint, very small, round, 10" diameter.

NGC 31
00 10 38.5 -56 59 11
V = 13.6; Size 1.1x0.6; Surf Br = 13.1; PA = 5d
30" (429x): this is the largest of 9 members of AGC 2731. Appeared moderately bright, moderately large, oval 3:2 N-S, 1.2'x0.8', broad concentration, bright core. Situated in the center of the cluster with NGC 28 1.8' W, NGC 25 5.7' SW and NGC 37 6.3' ENE. A mag 12 star lies 1.7' NNE.

2MASX J00112633-5655018
00 11 26.3 -56 55 02
Size 0.5'x0.4'; PA = 126d
Faint, small, slightly elongated, 20"x15", increases to a very small bright core and stellar nucleus. Located 2.5' NNE of NGC 37.

NGC 37
00 11 23.0 -56 57 26
V = 13.7; Size 1.1x0.7; Surf Br = 13.2; PA = 35d
30" (429x): fairly faint, fairly small, elongated 3:2 SSW-NNE, 0.6'x0.4'. Sharply concentrated with a very bright compact core, surrounded by a low surface brightness halo. A mag 15 star lies 0.8' E. 2MASX J00111972-5657065, a very compact galaxy, is just off the NW side. Located 6.3' ENE of NGC 31. A couple of faint members lie 2.5' NNE (2MASX J00112633-5655018) and 3' NE (2MASX J00114159-5655469).

2MASX J00114159-5655469
00 11 41.6 -56 55 47
Size 0.8'x0.2'; PA = 75d
Very faint, very small, slightly elongated, 12"x8". Collinear with two faint stars to N. Located 3' NE of N37 at the NE end of AGC 2731.


NGC 212 and 215 are the two dominant galaxies in AGC 2806, another member of the Phoenix Supercluster. This cluster contains mostly elliptical (E) and lenticular (S0) galaxies. There are two 10th magnitude stars in the center of the cluster that are somewhat distracting. Perhaps these stars masked some of the fainter members from John Herschel when he found the two NGC galaxies in October 1834 from the Cape. With the 30-inch I easily logged a dozen mag 16 members.

2MASX J00394109-5555568
00 39 41.1 -55 55 56
Size 0.7'x0.2'; PA = 146d
30" (11/4/10 - Coonabarabran, 429x): faint, small, elongated 5:2 NW-SE, 30"x12". Located 1.6' N of mag 10 SAO 232137. A mag 13 star lies 45" SE. 2MASX J00394502-5555029, an extremely faint and small companion, was picked up 1' NNE.

2MASX J00394502-5555029
00 39 45.2 -55 55 00
Size 0.4'x0.2'; PA = 172d
Picked up 1' NE of 2MASX J00394109-5555568 on the northern side of AGC 2806. Appeared extremely faint, very small, elongated 5:2 N-S, 10"x4". This galaxy is missing from Megastar, but seems no fainter than B = 16.7 (on the Megastar scale).

2MASX J00394510-5603559
00 39 45.1 -56 03 56
Size 0.8'x0.4'; PA = 81d
Fairly faint, small, elongated 3:2 E-W, 30"x20", very small bright core. Located 6.6' NNW of NGC 212.

2MASX J00395165-5615599
00 39 51.6 -56 16 00
Size 0.9'x0.5'; PA = 35d
Fairly faint, fairly small, elongated 2:1 SW-NE, 30"x15", bright core. Located 4.8' WSW of mag 10 SAO 232144 on the SW side of AGC 2806.

2MASX J00400423-5610499
00 40 04.2 -56 10 50
Size 0.7'x0.55'
Fairly faint, fairly small, slightly elongated SW-NE, 30"x25", brighter core. Located 2.1' SSW of NGC 212 and 1' NW of a mag 10 star.

2MASX J00400662-5609299
00 40 06.6 -56 09 29
Size 0.45'x0.35'
Faint to fairly faint, very small, slightly elongated, 20"x15", slightly brighter core. Picked up just 1' WSW of NGC 212.

NGC 212
00 40 13.3 -56 09 11
V = 13.4; Size 1.2'x1.0'; Surf Br = 13.6; PA = 131d
30" (429x): This galaxy, along with NGC 215, are the two brightest members in the core of AGC 2806. Appeared moderately bright, fairly small, irregularly round, ~55"x45", broad concentration. A dozen members were easily picked up in the 23' field. The nearest is 2MASX J00400662-5609299 just 1' WSW and NGC 215 lies 6' SE. Located 25' NW of mag 5.7 Xi Phoenicis and just 2.4' N of mag 9.6 SAO 232142.

2MASX J00402438-5613183
00 40 24.4 -56 13 18
Size 0.75'x0.4'
Faint, very small, round, 20" diameter. A mag 15 star lies 18" SE of center. Located 3.4' W of NGC 215 and two bright stars are nearby; mag 10 SAO 232144 lies 2.2' S and mag 9.7 SAO 232142 lies 2.7' NW.

2MASX J00402459-5616503
00 40 24.6 -56 16 50
Size 0.6'x0.2'; PA = 38d
Very faint, very small, slightly elongated, 15"x10". Located 1.4' S of mag 10 SAO 232144 and 5' SW of NGC 215, the brightest member of the cluster.

2MASX J00403303-5610573
00 40 33.0 -56 10 58
Size 0.6'x0.4'; PA = 90d
Very faint, very small, slightly elongated, 15"x12". Located nearly at the midpoint between NGC 212 and NGC 215, 3' from each galaxy. A mag 10 star is 3' WSW and a mag 12 star is 1.9' due W.

NGC 215
00 40 48.9 -56 12 51
V = 13.1; Size 1.1'x0.8'; Surf Br = 12.9; PA = 120d
30" (429x): this is the brightest member of AGC 2806. Appeared moderately to fairly bright, moderately large, elongated 4:3 NW-SE, well concentrated with a bright core that increases to the center. N212 (just barely inferior) lies 6' NW. Located 4' NE of mag 10 SAO 232144. The nearest two members are 2MASX J00402438-5613183 3.4' WSW and 2MASX J00403303-5610573 2.9' NW.

2MASX J00410787-5608283
00 41 07.9 -56 08 28
Size 0.8'x0.4'; PA = 60d
Fairly faint, fairly small, elongated 5:3 SW-NE, 25"x15", very small bright core, stellar nucleus, fades at tips. Located 5' NNE of NGC 215 and 7.6' E of NGC 212 in the core of AGC 2806. A mag 12.4 star lies 2' WSW.


NGC 7012 is the brightest member of the cluster Abell S921 (a southern supplement to the Abell catalogue). John Herschel, wasn't too sure about his discovery of N7012 in 1834. His notes read "A nebulous looking but doubtful object following a star 10 mag. My eye is too much fatigued to be able to decide on its nature." This time my Megastar chart wasn't complete enough as I picked up a few very small, faint galaxies near N7012 (10 total) that are missing even from the Mitchell Anonymous Catalogue (MAC). Interestingly, the cluster contains several slender edge-ons with roughly the same orientation.

ESO 286-048
21 06 28.9 -44 47 20
Size 1.2'x0.3'; PA = 37d
30" (11/5/10 - Coonabarabran, 429x): fairly faint, very elongated 7:2 SW-NE, 0.9'x0.25', brighter core. Located 3.4' NW of N7012.

Anonymous
21 06 48.1 -44 48 36
Picked up just 32" NE of the center of N7012 in a tight group of 5 galaxies within 2'. Appeared as a very faint knot, round, 10" diameter. LCRS B210329.4-450104 is just 25" SE. There is no listing for this galaxy in NED, HyperLeda or SIMBAD.

LCRS B210329.4-450104
21 06 49.4 -44 48 56
Picked up just 40" E of N7012. Appeared as a very faint knot, round, 10" diameter with a similar (uncatalogued) galaxy 25" NW. A very faint star is just off the SW edge, 17" from center, sandwiched between this galaxy and N7012.

NGC 7012
21 06 45.5 -44 48 53
V = 12.7; Size 2.5'x1.4'; Surf Br = 14.0; PA = 100d
Brightest galaxy in the core of ACO S921. I quickly took notes on 10 galaxies within a 10' circle including four small companions of N7012 within 2'! N7012 appeared fairly bright, moderately large, round, 50" diameter, well concentrated with a small bright core. The brightest nearby companion is ESO-LV 2860520 situated 1.3' SE but two fainter, very small companions (not included in Megastar) are just off the E and NE edge of the halo. ESO 286-048, a nice edge-on, lies 3.4' NW. A mag 12 star lies 1' SW and a mag 15 star is 27" SE of center.

2MASX J21065221-4454100
21 06 52.2 -44 54 10
Size 1.0'x0.4'; PA = 35d
Fairly faint, very elongated 7:2 SW-NE, 0.8'x0.25'. This galaxy is located 5.4' SSE of N7012 and has a similar appearance and position angle to ESO 286-048 situated 8' NW. A couple of chains of stars are to the south. ESO 286-54 lies 2.3' NE.

2MASX J21065660-4449137
21 06 56.6 -44 49 14
Size 0.4'x0.2'; PA = 13d
Picked up 2' ESE of N7012. Appeared very faint, very small, 15"x10". This is the last of four galaxies that follow within 2' of N7012!

ESO-LV 2860520
21 06 51.4 -44 49 34
Size 1.0'x0.7'; PA = 90d
This galaxy is located 1.3' SE of N7012 in a tight knot of 5 galaxies in the core of ACO S921. It appeared fairly faint, small, round, 20" diameter, small brighter core. 2MASX J21065660-4449137 lies 1' NE.

ESO 286-054
21 07 04.2 -44 53 13
Size 0.5'x0.4'
Fairly faint, small, round, 20" diameter, broad concentration. 2MASX J21065221-4454100 lies 2.3' SW. Located on the SE side of ACO S921.

2MFGC 15996

21 07 14.8 -44 48 14
Size 0.7'x0.2'; PA = 16d
Picked up 5.2' ENE of N7012 on the east side of ACO S921. Appeared very faint, small, elongated 2:1 SSW-NNE, 20"x10".

LCRS B210411.6-450111
21 07 31.3 -44 49 05
Size 0.5'x0.25'; PA = 18d
Picked up 8' due E of N7012 on the east end of the cluster. Appeared very faint, very small, elongated 3:2 SSW-NNE, 15"x10". 2MFGC 15996 lies 3' WNW.

--Steve Gottlieb
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Old 24-11-2010, 02:15 PM
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Suzy
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Join Date: Jan 2010
Location: Brisbane, Australia.
Posts: 3,672
Hi Steve,



I have posted a response for Parts 1,2&3, in Part 3 of your report. Amazing report, just amazing!
Thank you for posting and sharing your experience with us.
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