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(IAAC) Object: M10 - Instrument: Newt 12.5" f/4.8



Observer: Lew Gramer
Your skills: Intermediate
Date and UT of Observation: 1996-06-16, 04:10 UT
Location: Bath, ME, USA (44N)
Site classification: rural
Limiting magnitude: 7.1
Seeing: 2 - medium poor
Moon up: no
Instrument: Reflector 12.5" f/4.8
Magnification: 55x, 85x, 110x, 170x
Filters used: none
Object: M10
Category: Globular cluster
Constellation: Oph
Data: mag 6.6  size 15.1'
RA/DE: 16h57m  -04o06m
Description: A complex and pretty object, especially when
compared & contrasted with its near globular neighbor M12.
At higher power, it exhibits a poorly defined center, along
with a more diffuse concentration that is visible over 40%
of its surface. There is also a concentration or secondary
core of stars to the NNW, visible at 55x. Using 170x, 10
stars were resolved in the granular mass of M10. Some other
clumpings which may have been field stars were apparent at
a greater distance from the loose core.