(IAAC) Obj: Omicron Dra - Inst: Vixen 9x63 binoculars

anonymous at sedna.atmob.org anonymous at sedna.atmob.org
Thu May 10 22:12:39 EDT 2007


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Observation Poster: Stéphane Meloche <stephanemeloche at videotron.ca>

Observer: Stéphane Meloche
Your skills: Intermediate (some years)
Date/time of observation: 2007/04/21 6h53 UT 
Location of site: Ste-Catherine-de-Hatley, Québec, Canada (Lat 45.4542°, Elev 316 m)
Site classification: Suburban
Sky darkness: 5.2 <Limiting magnitude>
Seeing:  <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Vixen 9x63 binoculars
Magnification: 
Filter(s): 
Object(s): Omicron Dra
Category: Multiple star.
Class: 
Constellation: Dra
Data: mag 4.7 + 7.5  size 
Position: RA 18:51  DEC 59:24
Description:
In Draco, at ~ 3¾° NW of 39 Dra. Here a very special double star: in the first
second of observation, only the primary star is visible. But while remaining
well concentrated at the eyepieces, the secondary star ends up appearing at the
right position angle (326°), which shows a much lower brightness than the
primary star. The primary star is yellow-orange and the secondary is too weak to
see any color.
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