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(IAAC) Obj: sigma Ori - Inst: Orion 6" Dob



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Observer: William L.Schart
Your skills: Intermediate (some years)
Date/time of observation: 12/26/99 10:29 pm CST
Location of site: Killeen, TX (Lat 31, Elev 820)
Site classification: Suburban
Sky darkness: 4.5 <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Orion 6" Dob
Magnification: 32x, 48x, 72x, 98x, 144 
Filter(s): none
Object(s): sigma Ori
Category: Multiple star.
Class: 
Constellation: Ori
Data: mag   size 
Position: RA :  DEC :
Description:
Appears in the same field of view as Struve 761. Easily split at 32x, but 72X reveals a third member very close to the primary. The primary is yellow, with blueish companions. The closest pair are 17" apart, the 2 fainter ones are 25" apart, the whole group spans 33". PA's: from the primary to the closest secondary: 90 degrees, from this secondary to the farthest one is 120 degrees, while from the primary to the farthest member 110 degrees.
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