(IAAC) Obj: NGC 4138 - Inst: 10" f/4.5 Dobsonian

Observation Poster: Brent Reary <gmbreary@rollanet.org>
Observer: Brent Reary
Your skills: Intermediate (some years)
Date/time of observation: 04/02/03  02:15 UT
Location of site: Rolla, MO  USA (Lat 37 57N, Elev )
Site classification: Rural
Sky darkness:  <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 10" f/4.5 Dobsonian
Magnification: 36x, 68x, 72x, 136x
Filter(s): None
Object(s): NGC 4138
Category: External galaxy.
Constellation: CVn
Data: mag 11.3  size 2.6' X 1.7'
Position: RA 12:09.5  DEC +43:41
An elongated oval halo of uniform brightness.  Aligned NW-SE.  Brightens toward
the core.  There is a faint field star off the N. edge.  In the same low power
field with NGC 4143.  Located with averted vision at 36x.  Bears magnification
well.  Best seen at 136x.
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