(IAAC) Obj: Delta Cygni - Inst: 12.5" f8 Dob/ 6" f10 EQ-Newt

Observer: Scott Hogsten
Your skills: Intermediate (some years)
Date/time of observation: Aug/12/1998 20:30 EST
Location of site: Perkins Observatory (Lat , Elev )
Site classification: Suburban
Sky darkness: 5.5 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 12.5" f8 Dob/ 6" f10 EQ-Newt
Magnification: 150x -700x
Filter(s): None
Object(s): Delta Cygni
Category: Multiple star.
Constellation: CYG
Data: mag 2.9 / 6.5  size 
Position: RA :  DEC :
This is a wonderful close double. The two stars of mag 2.9 and 6.5 are
separated by 2.5 arc-seconds. The stars were easily split by both
scopes at 150x. The brightness difference adds a bit of difficulty to
the observation. Both stars appear predominatly blue-white and from
research they are a physical pair with a period of 687 years.
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