NGC 4490 (UGC 7651, Arp 269)  and NGC 4485 (UGC 7648) Galaxies in Canes Venatici

NGC 4490 located at: RA 12 hours 30 minutes 36 seconds, Dec +41 degrees 38 minutes 33 seconds

Size: 6.3' x 2.7' and 2.6' x 1.9' Magnitude: 10.2 blue and 12.3 blue Class: SB(s)d pec HII and IB(s)m pec HII

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, 370 minutes (37 x 10 minute subs), 04/19/23/2015; seeing 2.2-3.5 FWHM per CCDStack

Processing:

CCDStack 2.90.5589.16047, Photoshop CS5.1

Location:

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

Notes: Posting what I have for now, but I wanted one more night on this duo. NGC 4490 is the larger galaxy.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 4490
NGC 4490 = UGC 07651 = MCG +07-26-014 = CGCG 216-008 = Cocoon Galaxy  
= Ho 414a = VV 30 = LGG 290-008 = PGC 41333
12 30 36.1 +41 38 34
V = 9.8;  Size 6.3x3.1;  Surf Br = 12.9;  PA = 125d

18" (6/4/05): very bright, large, elongated 2:1 NW-SE, contains a  
large, bright core.  At the NW end a faint arm appears to emerge  
hooking sharply to the north for 1' towards N4485.  At the SW end,  
there appears to be slight extension without much curvature near a  
16th magnitude star.  The central region is weakly concentrated to  
the center.  Overall, the galaxy has a mottled, slightly splotchy  
appearance as if was dusty or knotty with HII regions.

13.1" (2/16/85): very bright, striking, elongated 2:1 NW-SE, 6'x3',  
large bright core is elongated and grainy.  A faint arm extends from  
the NW end in the direction of N4485 3.6' NNW.  A small extension  
(arm) at the SE end is suspected.

- by Steve Gottlieb

Contemporary Visual Observation(s) for NGC 4485
NGC 4485 = UGC 07648 = MCG +07-26-013 = CGCG 216-007 = Arp 269 = VV 30 = PGC 
41326
12 30 31.4 +41 42 01
V = 11.9;  Size 2.3x1.6;  SB = 13.2;  PA = 15d

13.1": moderately bright, fairly small, brighter core, elongated SSW-NNE.  Forms 
a fascinating interacting pair with N4490 3.6' SSE of center.  Located 30' NW of 
Beta Canum Venaticorum (V = 4.3).

- by Steve Gottlieb