(IAAC) Obj: NGC 2355 - Inst: 13" f/5.6 Newtonian on Bigfoot German EQ

Observer: Steve Coe
Your skills: Advanced (many years)
Date/time of observation: 12 Feb 1999
Location of site: Salome, Arizona USA (Lat +34, Elev 3000 ft)
Site classification: Rural
Sky darkness: 8 <1-10 Scale (10 best)>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument:  13"  f/5.6 Newtonian on Bigfoot German EQ 
Magnification: 100X, 150X, 220X
Object(s): NGC 2355
Category: Open cluster.
Constellation: GEM
Data: mag 9.7  size 9.0'
Position: RA 07:17  DEC +13:47
In the 11X80 finder this is a tiny fuzzball next to a 7th mag star.
In the 13" at 100X it is pretty bright, pretty small, pretty rich
and considerably compressed.  I counted 26 member stars at this power
and there is a fuzzy background of un-resolved stars with averted vision.
Moving up to 150X shows 32 stars resolved in this cluster and a much
better view.  The cluster takes up about half of the field of view.  What
was a double star on the east side is now resolved into a triple with a
delicate 13th mag companion.  It would seem that all the members of this
cluster are now resolved.  There are several yellow and blue members of
this nice cluster.  Going to 220X does not bring out any more stars.
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