(IAAC) Obj: M25 - Inst: 4.5" Homemade Dobson reflector, f/8
Ante Perkovic
albireo at vip.hr
Wed Aug 11 06:38:13 EDT 2004
Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July 22nd 2004., 1:35h
Location of site: Kasjuni beach, Split, Croatia (Lat. 43.5 N, Elev. 0m)
Site classification: Suburban
Sky darkness: 5.0 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 4.5" Homemade Dobson reflector, f/8 ("babydob")
Magnification: 25x, 48x, 79x
Filter(s): None
Object(s): M25
Category: Open cluster
Class:
Constellation: Sgr
Data: mag 4.6 size 29'
Position:
Description:
25x: More than 20 stars are cramped in a very bright dense core, 10'
in size, while other fainter stars obviously require greater power. 5 to
6 more stars are scattered in the outer regions.
48x: More than 35 stars, but still greater power is needed to resolve
the core where I expect to see 4 to 5 more stars.
79x: Core dissolves to 4 stars inside 1', 40 stars in the entire cluster.
This cluster is 3.5 deg. E of M24, but I starhopped from NGC6645 that is
2 deg N. The cluster can be easily recognised by 60' long arch of 5- and
6-mag stars 60' N of it and 20' long arch of 3 somewhat dimmer stars on
the cluster's N edge.
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