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(IAAC) Obj: Cr70, Orion OB1 Association, Belt of Orion - Inst: Celestron 80mm, f/5, refractor, manual EQ mount



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Observation Poster: Don Clouse <dlcdeepsky@home.com>
Observer: Don Clouse
Your skills: Intermediate (some years)
Date/time of observation: 2/5/00, 12:11 eastern
Location of site: Winter Star Party, Florida Keys (Lat 25N, Elev 10ft)
Site classification: Rural
Sky darkness: 6 <Limiting magnitude>
Seeing: 6 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Celestron 80mm, f/5, refractor, manual EQ mount
Magnification: 11x
Filter(s): none
Object(s): Cr70, Orion OB1 Association, Belt of Orion
Category: Open cluster.
Class: Trumpler 3 3 r n
Constellation: Ori
Data: mag 0.6  size 150'
Position: RA 05:35  DEC -01:05
Description:
With a 35mm Ultima yeilding 11x with a 4.3 degree field of view, 150 to 200
stars were visible centered on Orion's Belt in a rough oval.  The members are
fairly evenly distributed both spacially and by magnitude - a very open and
loose cluster with no centralization.  This group of young stars, which does
include the Belt stars, formed together about 12 million years ago.  It is
known as the Orion OB1 Association.
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