NGC 1931 (Lund 182, Cr 68) / Sh2-237 (LBN 810)  Open Cluster / Bright Nebula in Auriga

Located at: RA 05 hours 31 minutes 36 seconds, Dec +34 degrees 14 minutes 42 seconds

Size: 6.0' / 7.0' Magnitude: 10.1 / -- Class: I 3 p n / Emission (Sharpless) 3 2 3

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, 450 minutes (45 x 10 minute subs), 01/2/4/2014; seeing 3.1-4.8 FWHM per CCDStack

Processing:

CCDStack 2.76.5115.24309, Photoshop CS5.1

Location:

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

Notes: Still imaging around the weather ... periods of varying thickness of high clouds and/or high winds. I am posting what I have for now, as we are supposed to have high winds (30mph, gusts to 45mph) today/tonight and 'partly cloudy' the next few days. See a very early 8" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 1931
NGC 1931 = Sh 2-237 = LBN 810 = Cr 68
05 31 26 +34 14.7
V = 11.3;  Size 3x3

17.5": five stars (three brighter mag 11.5/12/3/13 stars) located within a 
bright, small nebulosity of high surface brightness.  A sixth very faint star is 
just outside the nebula.  Dims with OIII filter so must have a predominant 
reflection component.  The three brighter stars are separated by 8" and 10" from 
the mag 11.5 star.

13": five stars involved including three close fairly bright stars. A fourth 
very faint star to the west, fifth very faint star NE and sixth extremely faint 
star west.  This is a bright, high surface brightness nebulosity.

8": compact, striking nebulosity involving several stars.

- by Steve Gottlieb