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(IAAC) Obj: Melotte 20, Perseus OB3 Association - Inst: 80mm, f/5, Celestron refractor



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Observation Poster: Don Clouse <dlcdeepsky@home.com>
Observer: Don Clouse
Your skills: Intermediate (some years)
Date/time of observation: October, 10 1998, 11:15pm EST
Location of site: 4 miles SE of downtown Louisville, KY (Lat 38, Elev approx. 400 ft)
Site classification: Urban
Sky darkness: 4.0 <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 80mm, f/5, Celestron refractor 
Magnification: 11x and 27x
Filter(s): none
Object(s): Melotte 20, Perseus OB3 Association
Category: Open cluster.
Class: Trumpler Type III 3 m
Constellation: Perseus
Data: mag 1.2  size 3 degrees
Position: RA 3:22  DEC 49:0
Description:
At 11x (4.3 degree true f.o.v. - Celestron 35mm Ultima)I counted 30 stars in
the vicinity of Mirphak.  At 27x (2.5 degree true field, 15mm Panoptic)over 50
stars were visible in the field with Mirphak offset from the center.  Some
stars were quite faint.  A nice field.  (Under dark skies the number of stars
quadruples!)
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