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NGC1931 (Open Cluster, in Auriga, Est. RaDec 05h31.4m, +34d15')
Observer: Dave Mitsky (e-mail: djm28@psu.edu)
Instrument: 17-inch equatorial reflector Location: Harrisburg, PA, USA
Light pollution: moderate Transparency: fair Seeing: fair
Time: Mon Dec 7 01:40:00 1998 UT Obs. no.: 429
While observing some of the open clusters in Auriga I turned my attention to the emission/reflection nebula (and presumably open cluster) NGC 1931, an object that I had not observed for a number of years. This small (approximately 3' by 3') diffuse nebula surrounds the ninth magnitude triple star ADS 4112 (page 97 Uranometria I). This is one nebula that stands up to light pollution fairly well. I used magnifications of 118, 202, and 259x while observing this DSO. There is an excellent CCD image of NGC 1931 at http://members.home.net/rcoleman/1931.htm (.)
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