NGC 4874 (UGC 8103) / NGC 4889 (UGC 8110) / NGC 4921 (UGC 8134)

Galaxies in Coma Berenices

Near the center of the Coma Cluster (AGC 1656)

Center of field at approximately: RA 13 hours 00 minutes 36 seconds, Dec +27 degrees 57 minutes 54 seconds

Center of Coma Cluster located at: RA 12 hours 59 minutes 48 seconds, Dec +27 degrees 58 minutes 00 seconds

Coma Cluster Size: 224' Magnitude of 10th brightest galaxy: 13.5 Number of members: 106 Richness Class: 2 1 II

NGC 4874 / NGC 4889 / NGC 4921 Size: 2.3' x 2.3' / 2.8' x 2.2' / 2.0' x 1.7' Magnitude: 12.6 blue / 12.5 blue / 13.0 blue Class: E+0 (cD;Di*) / E+4 (cD;Dd*) / SB(rs)ab

North is up

West to the right

Telescope:

8" f5 Newtonian reflector

Camera:

ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

 Lumicon Red filter, 920 minutes (92 x 10 minute subs), 06/19/20/21/22/23/2012; seeing FWHM 2.4-3.0 per CCDStack

Processing:

CCDStack 2.66.4490.32361, Photoshop CS5.1

Location:

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

Notes:* My charting software (Megastar v5.0.13) lists the center of the Coma Cluster as just to the east (left) of NGC 4874 (the first large galaxy at the right). Since my imaging field (31' x 46') is much smaller than the listed size of AGC 1656, I positioned this field to include some of the more 'photogenic' galaxies in the cluster, to include NGC 4921 (the spiral galaxy to the southeast <lower right> of center).

The are 28 NGC objects (according to Megastar v5.0.13) in this field ... I will only cite 5 of the NGC / IC Project descriptions. See this marked field for all the NGC objects. There are also numerous IC / PGC / etc. objects in the field.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 4874
NGC 4874 = UGC 08103 = MCG +05-31-070 = CGCG 160-231 = PGC 44628
12 59 35.7 +27 57 33
V = 11.7;  Size 1.9x1.9;  SB = 13.1

17.5": second brightest galaxy in the core of Abell 1656.  Fairly faint, fairly 
small, slightly elongated, bright core.  Located 6.4' S of mag 7.2 SAO 82595.  A 
mag 12 star lies 2.5' WSW.  Surrounded by a halo of faint galaxies including 
N4872 52" SSW, N4871 1.3' W, N4873 1.6' NNW, IC 3998 2.3' ENE.

13": fairly faint, round, fairly small, 2nd brightest in Abell 1656.  A mag 7 
star lies about 6' N and a mag 12.5 star 2' SW.  Numerous companions are nearby 
in the field.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 4889
NGC 4884 = N4889 = U08110 = MCG +05-31-077 = CGCG 160-241 = PGC 44715
13 00 08.1 +27 58 37
V = 11.5;  Size 2.9x1.9;  SB = 13.3;  PA = 80d

See observing notes for N4889.

Discovered by d'Arrest.  The NGC description "chief one of multiple neb" appears 
to describe N4889.  His position is just 7 tsec W of N4889 and the only bright 
galaxy in the immediate vicinity.  Reinmuth has "not found; =N4889" (repeated in 
Carlson).

- by Steve Gottlieb

=================================================================
NGC 4889 = UGC 08110 = MCG +05-31-077 = CGCG 160-241 = N4884 = PGC 44715
13 00 08.1 +27 58 37
V = 11.5;  Size 2.9x1.9;  SB = 13.3;  PA = 80d

17.5": largest and brightest galaxy in Abell 1656 = Coma I galaxy cluster.  
N4889 and N4874 9.2' W are both surrounded by a cloud of faint galaxies.  
Moderately bright, fairly small, oval E-W, bright core.  Several companions near 
including N4886 1.0' NW, N4894 1.9' ESE, N4898 2.4' SE which are all collinear 
with N4889 and IC 4011 1.6' N.

13": fairly bright, fairly small, oval E-W.  Largest and brightest in Abell 1656 
= Coma I.  N4874 lies 7' W and several companions are near.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 4889
NGC 4884 = NGC 4889.  As with NGC 4882 = NGC 4886 (which see), the only 
problem with d'A's observation is the RA offset on one night.  Otherwise, his 
observation is appropriate:  "Brightest of a multiple nebula ..."  In this 
case, he has seven other observations which he attributes to this galaxy.  
Among these are two made on the two nights previous to his NGC 4884 
observation, 20 and 21 April 1865.  So, I'm amazed that he did not immediately 
recognize the field that he had swept over twice on the previous nights -- 
this is a strikingly rich field, and his observations of the galaxies in the
Coma Cluster are liberally sprinkled with comments to that effect.  I would
have expected his visual memory to kick into overdrive, but if it did, he
chose to ignore it.

Well, for whatever reason, he entered the observation as if for a separate 
object, so it ended up in the NGC as number 4884. - Dr. Harold G. Corwin, Jr.
Contemporary Visual Observation(s) for NGC 4907
NGC 4907 = MCG +05-31-089 = CGCG 160-257 = PGC 44819
13 00 48.8 +28 09 29
V = 13.6;  Size 1.1x1.0;  SB = 13.5

17.5": faint, small, slightly elongated SSW-NNE, even surface brightness.  A mag 
13 star is just off the S end.  Nearby galaxies include CGCG 160-251 3' WSW and 
IC 4045 5' S.  Located NE of the central core of Abell 1656.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 4911
NGC 4911 = UGC 08128 = MCG +05-31-093 = CGCG 160-260 = PGC 44840
13 00 56.1 +27 47 27
V = 12.8;  Size 1.4x1.3;  SB = 13.3

17.5": fairly faint, fairly small, oval WNW-ESE, weak concentration.  A mag 12 
star is 2' NW.  Forms a close double with the very faint galaxy M+05-31-094 at 
the SW edge.

13": faint, small, round.  A mag 13 star is close W.  First of three in the 
field.  Located 18' SE of core of Abell 1656.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 4921
NGC 4921 = UGC 08134 = MCG +05-31-098 = CGCG 160-095 = PGC 44899
13 01 26.1 +27 53 09
V = 12.2;  Size 2.5x2.2;  SB = 13.8;  PA = 165d

17.5": fairly faint, fairly small, bright core, large low surface brightness 
halo surrounded core.  This is one of the brighter members of Abell 1656 but it 
appears fainter than the integrated V magnitude suggests.  Nearby are N4923 2.7' 
SSE and N4919 5.1' SSW.

13": fairly faint, fairly small, round, 3rd of 3, Abell 1656.

- by Steve Gottlieb
* NED designation.