NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC1931
Basic Information
Location and Magnitude
Right Ascension: 5:31:25.7
Declination: +34:14:42
Constellation: AUR
Visual Magnitude:
Historic Information
Discoverer: Herschel W.
Year of discovery: 1793
Discovery aperture: 18.7
Observational
Summary description: vB, L, R, B *** in M
Sub-type: EN+OCL
Steve's Notes
=====
NGC 1931
18" (1/20/07): bright, high surface brightness nebula, ~2'x1.5', surrounds six stars including two mag 11/12 stars, a mag 13 star and three fainter stars. The central 4 stars = ADS 4112 (one difficult in fairly poor seeing) form a small trapezium asterism. Best view is unfiltered. IC 417 lies 45' WNW.
17.5" (2/8/86): five stars including ADS 4112 (mag 11.5/12.3/13 at 8" and 10") are located within a bright, small nebulosity of high surface brightness. A sixth very faint star is just outside the nebula. Dims with OIII filter.
13" (11/5/83): 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" (11/8/80): compact, striking nebulosity involving several stars.