AGC 2151 (ACO 2151) Galaxy Cluster in Hercules

Center of field at approximately: RA 16 hours 05 minutes 10 seconds, Dec +17 degrees 42 minutes 43 seconds

Size: 56' Magnitude: 10th brightest 13.8 Class: 2 1 II, # galaxies 87

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, 670 minutes (67 x 10 minute subs), 07/8/9/10/11/2016; FWHM 2.4-3.9 per CCDStack

Processing:

CCDStack 2.92.6001.26126, Photoshop CS5.1

Location:

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

Notes: This Abell Galaxy Cluster is larger than my imaging field (~17' x 26'), so I centered on more or less what my software (Megastar v5.0.14) indicates is the center (16h 05m 12s, +17d 44m 00s). The elliptical galaxy just above center is NGC 6047.

There are many scientific names for this galaxy cluster (see the CDS listing), but it is also known as the Hercules Galaxy Cluster, Hercules Supercluster, etc. See marked NGC/IC objects.

NGC 6047 from the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6047
NGC 6047 = MCG +03-41-087 = CGCG 108-111 = 4C 17.66 = PGC 57033
16 05 09.0 +17 43 47
V = 13.5;  Size 1.1x0.8;  SB = 13.4

17.5": very faint, very small, round.  A mag 13.5 star is just 26" NW of the 
center.  This galaxy is the third of three in a the central region of Abell 2151 
with N6043 3.3' NNW and N6045 1.7' NNW.  Also nearby is N6050 4.0' NW.

13": very faint, very small.  Third of four in a subgroup of Abell 2151 and 
located 2' SSE of N6045.  A mag 13.5 star is very close W.

- by Steve Gottlieb