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(IAAC) Obj: NGC 7789 - Inst: 13" f/5.6 "Bigfoot" German Eq. mount



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Observer: Steve Coe
Your skills: Advanced (many years)
Date/time of observation: 24 Jan 98
Location of site: Sentinel, AZ (Lat +33, Elev 1800 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 "Bigfoot" German Eq. mount
Magnification: 100X, 150X, 220X
Filter(s): none
Object(s): NGC 7789
Category: Open cluster.
Class: 
Constellation: Cas
Data: mag   size 16'
Position: RA 23:57  DEC +56:44
Description:
This spectacular cluster is easy in the 11X80 finder.  At 100X in the
13" I can count 76 stars across the face of the entire cluster and it is
bright, very large, very rich, much compressed and is much brighter in
the middle.  The stars are of mags 10 and fainter.  The cluster takes up
about one third of the field of view in the 22mm Panoptic.  A terrific
view of this cluster, there are several lovely chains of stars that
snake their way across the cluster.  Raising the power to 150X resolved
63 stars in the NE quadrant, for a total estimate of nearly 250 stars
seen.  The cluster is about half of the field, providing the best view.
The chains of stars are very prominent at this power and there are 
several dark lanes that curve and bend within this thick cloud of stars.
An excellent view of one of the skies' superior showpieces.  Going up to
220X will bring out 8 or 10 faint binaries within the cluster.  All in 
all, a favorite on any clear night.
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