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(IAAC) M100 galaxy 20" Dobsonian



Observer: Nick Martin
Your skills: Intermediate
Date/time of observation: 20/04/2001 01:30 UT
Location of site: Bonnyton house drive, Ayrshire, Scotland
Site classification: rural
Sky darkness: 6 <zenithal limiting magnitude>
Seeing: III <I-V Seeing Scale (I best)>
Moon presence: None - moon not in sky
Instrument: 20" F4.4 Newton on Dobsonian mount
Magnification: X240
Filter(s): None,
Object: M100  (NGC4321)
Object type: External galaxy.
Class: SAB
Position:12 20.4  +16 06 
Constellation: Coma Berenices
Data: Mag. 9.4  Size 6.9' X 6.2'
Object Rating: B
Description: On first appearance the galaxy had a bright core and very
diffuse outer regions. More prolonged examination  showed spiral structure
turning clockwise in the field. A lot of mottling was also visible. There is
a faint star on the following edge of the galaxy, which filled about 1/4 of
the eyepiece field.
Nick Martin, Bonnyton House, By Ayr, Ayrshire KA6 7EW ,Scotland, UK.
 Latitude 55 24'56" Longitude 4 26' 00".
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