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(IAAC) Obj: M 4 - Inst: 120 mm KONUS refractor, f/8.33, eq. mount



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Observation Poster: Natko Bajic <natkobajic@yahoo.com>
Observer: Natko Bajic
Your skills: Intermediate (some years)
Date/time of observation: May, 12th, 2001.
Location of site: Vinisce, near Split, Croatia (Lat 43.5, Elev )
Site classification: Rural
Sky darkness: 6.0 <Limiting magnitude>
Seeing:  <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 120 mm KONUS refractor, f/8.33, eq. mount
Magnification: 40x, 100x
Filter(s): None
Object(s): M 4
Category: Globular cluster.
Class: 
Constellation: Sco
Data: mag 5.6  size 26.3'
Position: RA 16:23.6  DEC -26:32
Description:
Magnificant globular, filling about 1/3 field of view at
100x. Completely resolved at every magnification. I could clearly
see the famous central bar structure. West of it, in the cluster,
I could see about dozen of relatively bright stars (brightest in
the globular), while in the eastern part I counted only four
similar stars. At 40x it seems uniform, but 100x and averted
vision helped me to see the obvious central brightening. Cluster
seemed quite round to me. Field of view is not very rich. Sketch
is available at the mentioned URL.
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Optional related URLs: www.geocities.com/natkobajic
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