NGC 3198 (UGC 5572) Galaxy in Ursa Major

Located at: RA 10 hours 19 minutes 55 seconds, Dec +45 degrees 33 minutes 09 seconds

Size: 8.8' x 3.3' Magnitude: 10.9 blue Class: SB(rs)c HII

North is up

West to the right


 14.5" f5 Newtonian reflector


 ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56


Lumicon Red filter, 660 minutes (66 x 10 minute subs), 02/16/18/25/26/2016; seeing 2.0-3.9 per CCDStack


CCDStack 2.90.5589.16047, Photoshop CS5.1


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


I started imaging this nice galaxy on the 16th, thinking it was far enough from the moon (which was approaching full) to complete in a few nights ... I was wrong! As the moon approached full, it started interfering with NGC 3198, so I tried imaging a planetary in Orion (see PK 193-9.1). As with PK 193-9.1, the gradients created by the nearness of the moon caused me to take more subs than I normally would (I used 66 out of 100 subs for this image).

Still dealing with the mostly clear and warm, but breezy to windy, "winter" conditions here in Southern California.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 3198
NGC 3198 = UGC 05572 = MCG +08-19-020 = CGCG 240-030 = PGC 30197
10 19 54.8 +45 32 59
V = 10.3;  Size 8.5x3.3;  SB = 13.8;  PA = 35d

17.5": fairly bright, large, very elongated 3:1 SW-NE, 7.0'x2.5', broadly 
concentrated, brighter core has an indistinct elongated nucleus and an irregular 
surface brightness.  Two mag 14 stars are close S (nearest is 2.0' from the 
center) and a mag 11 star is just off the NNE edge 3.5' from the center.

- by Steve Gottlieb