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(IAAC) Obj: IC 2156, IC 2157 - Inst: 15 inch Obsession f4,5



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Observation Poster: Armin Hermann <burmeseinn@yahoo.com>

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 03 Feb 2005
Location of site: Sangkhlaburi, Thailand (Lat 15°09' N, Elev 200m)
Site classification: Exurban
Sky darkness: 5,0 <Limiting magnitude>
Seeing: 9 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 131 and 342x
Filter(s): none
Object(s): IC 2156, IC 2157
Category: Open cluster.
Class: --
Constellation: Gem
Data: mag --  size --
Position: RA :  DEC :
Description:
At 131x the two objects appear as a loose double cluster. IC 2156 is located 5' 
N of the brighter and richer IC 2157. At 342x IC 2156 resolves into approx one 
dozen stars of magnitude 12 to 14. It is barely recognizable as an open star 
cluster, though. IC 2157 shows some 25 stars at 342x magnification. The 
brightness of the stars ranges from 12mag down to under 14,5mag.
IC 2156 is listed in Uranometria as an Assoziation with 3,5' diameter. IC 2157
is listed as an OC with 8,4mag and 5' diameter.


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