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(IAAC) Obj: NGC 2509 - Inst: 15" f4.5 Obsession



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

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 23 Mar 2004
Location of site: Sangkhlaburi/Thailand (Lat +15, Elev 200m)
Site classification: Exurban
Sky darkness: 5.0 <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15"  f4.5  Obsession
Magnification: 342x
Filter(s): none
Object(s): NGC 2509
Category: Open cluster.
Class: 
Constellation: Pup
Data: mag 9.3  size 8'
Position: RA 08:01  DEC -19:
Description:
This rich OC features a very strange shape. N of its center is a concentration of 
~10 stars. NE and S of that concentration two loops of stars seem to form rings 
(2’ diameter) with few stars in their middle. I could count approx 50 stars of 
magnitude 11 to 15 at 342x magnification. Interesting object!

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** This observing log was submitted via the IAAC Web form:
  www.visualdeepsky.org/enter-log.html