NGC 4589 and NGC 4572 (UGC 7797 and UGC  7775) Galaxies in Draco

Center of field at approximately: RA 12 hours 36 minutes 36 seconds, Dec +74 degrees 11 minutes 45 seconds

Size: 3.1' x 2.5' and 1.8' x 0.6' Magnitude: 11.7 blue and 14.9 Class: E2 and S

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

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

Image:

Lumicon Red filter,  490 minutes (49 x 10 minute subs), 03/3/4/5/2015; seeing 2.9-5.2 FWHM per CCDStack

Processing:

CCDStack 2.87.5531.19367, Photoshop CS5.1

Location:

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

Notes: I imaged this field (and the ADS 6366 Group) around full moon. This duo of galaxies (NGC 4572 to the west <right>) is close to the north pole, and I could image without the moon interfering (other than brightening the sky). Unfortunately, the winds (off-shore) appeared, and the seeing got much worse than when I began the imaging run (03/03).

From the NGC/IC Project:

Contemporary Visual Observation(s) for NGC 4589
NGC 4589 = UGC 07797 = MCG +12-12-013 = CGCG 352-038 = LGG 284-008 
= CGCG 335-017 = PGC 42139
12 37 25.0 +74 11 31
V = 10.7;  Size 3.2x2.6;  SB = 13.0;  PA = 75d

18" (5/8/04): bright, fairly large, elongated ~4:3 E-W, 2.5'x2.0'.  Sharply 
concentrated with a very bright prominent core and a fainter halo.  A mag 13 
star is at the west edge of the core.  Forms a pair with N4572 7.5' NW and N4648 
lies 22' NE.  A wide mag 8/10.5 double at 24" lies 17' NE (in the field with 
N4648).

- by Steve Gottlieb

Contemporary Visual Observation(s) for NGC 4572
NGC 4572 = UGC 07775 = MCG +12-12-012 = CGCG 352-037 = PGC 41991
12 35 45.5 +74 14 34
V = 13.9;  Size 1.6x0.5;  SB = 14.3;  PA = 170d

18" (5/8/04): faint, moderately large, appears as a very low surface brightness 
glow oriented NNW-SSE, ~1.2'x0.8', with just a weak concentration.  Located 7.5' 
NW of brighter N4572.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 4572
NGC 4572 = CGCG 352-037 is a galaxy northwest of NGC 4589.  It was seen by 
both WH and JH, but Bigourdan's observation under "NGC 4572" actually refers 
to a star a few arcmin southeast of the galaxy.

The galaxy has also been taken by some to be identical to IC 802 (which see).
But Bigourdan found that (also a star) the same night as his observation of
"NGC 4572", and his precise measurements of both show that they cannot be the 
same. - Dr. Harold G. Corwin, Jr.
Correction Disclaimer
As with all corrections to the NGC and IC Catalogues, there is a certain margin
for error, even though the evidence supporting the correction may be strong and
compelling. It is with this in mind that we ask the user to use this information
as 'Most Probable', but never to assume the correction is 'Absolute'.  All
published corrections are based on an exhaustive 'paper chase' of the historical
record back to the original discoverer's published notes/papers, and are
therefore based upon the historical accuracy (or inaccuracy) of those particular
notes/papers. In short, Caveat Emptor! - Robert E. Erdmann, Jr.