NGC 1961 (IC 2133, UGC 3334) group of Galaxies in Camelopardalis

Center of field at approximately: RA 05 hours 43 minutes 58 seconds, Dec +69 degrees 17 minutes 40 seconds

NGC 1961 = Size: 4.5' x 2.9' Magnitude: 11.7 blue Class: SAB(rs)c

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, 970 minutes (97 x 10 minute subs), 01/6/7/9/12/13/2012; seeing 2.3-4.8 FWHM per CCDStack

Processing:

CCDStack 2.55.4392.26193, Photoshop CS 5.1

Location:

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

Notes: NGC 1961 is the obvious galaxy to the northwest (upper right) ... other galaxies are UGC 3342 (1.7'x0.3', 15.2p mag, Cl:Scd:) and UGC 3344 (2.4'x1.5', 14.2p mag, Cl:SABbc), and UGC 3349 (1.0'x0.6', 14.4p mag, Cl:Sab) from west to east (right to left). See this image of named objects from Megastar v5.0.13.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 1961
NGC 1961 = UGC 03334 = MCG +12-06-007 = CGCG 329-008 = Arp 184 = IC 2133 = PGC 
17625
05 42 04.4 +69 22 46
V = 11.0;  Size 4.6x3.0;  SB = 13.7;  PA = 85d

17.5" (12/8/90): moderately bright, moderately large, elongated 2:1 E-W, weak 
concentration, small bright core.  A mag 13 star is 30" SSE of center and a mag 
12 star is just off the W edge 2.4' from center.  Appears to have a dark patch 
between this star and the core.  Forms a pair with CGCG 329-011 7.6' NE (not 
seen).

8" (10/13/81): faint, moderately large, bright core, diffuse, elongated, star 
involved.

Discovered by WH (III 747).  There was an erroneous reduction of Herschel's 
position in NGC (noted by Dreyer in 1912 NGC Correction list).  The correct 
position for this galaxy (U03334 = M+12-06-007 = Arp 184) was later given by 
Bigourdan and received the number IC 2133.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 1961
The place of H III - 747 is wrong, it is = IC 2133. - J.L.E. Dreyer
(Royal Astronomical Society Notices; 73 - 37 (1912)
 - Robert E. Erdmann, Jr.
=================================================================
IC 2133 = NGC 1961.  Here is one of the objects that forces me to ask the
question "What was Bigourdan thinking?"  He measured it twelve times on three
nights, could not find NGC 1961 when he looked for it on one of those nights,
and must have been aware that WH's positions were subject to large accidental
errors.  So, how could Bigourdan believe that his "Big. 385" was a new object
and not the one that WH found?

Well, he obviously did because the object ended up in the 2nd IC.  Dreyer 
discovered the identity a few years later when he prepared WH's Scientific 
Papers for publication.  There is no doubt about the identity, either.

So, "What was Bigourdan thinking?"  (Obviously, a rhetorical question.)
Also see NGC 1961 for the story of WH's mistaken position.
 - Dr. Harold G. Corwin, Jr.