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(IAAC) Obj: NGC 4647 - Inst: 20" f/5 Dobsonian



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Observer: Lew Gramer
Your skills: Intermediate (some years)
Date/time of observation: 1998-01-01/02 10:40 UT
Location of site: Deerfield Township, OH, USA (Lat 41oN, Elev 100m)
Site classification: Rural
Sky darkness: 6.8 (cirrus) <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 20" f/5 Dobsonian
Magnification: 70x, 210x
Filter(s): None
Object(s): NGC 4647
Category: External galaxy
Class: Sc
Constellation: Vir
Data: mag 11.4  size 3.0'x2.5'
Position: RA 12:43  DEC +11:35
Description:
NGC 4647 is the faintest but not the least interesting member of a bright trio
of galaxies with M60 and M59 (see other logs this night). This loose spiral was
an intriguing, irregularly diffuse "echo" of larger M60's halo, distinct from
the nearby elliptical at first, but then gradually linking with the outermost
SE edge of M60's halo in averted vision. At higher power (12mm TV, 210x, 23'),
a brightening was apparent slightly off-center of the halo, with a hint of a
stellar nucleus embedded in it. The halo itself appeared much more regular, as
a symmetric "double lobe" or "S shape", with averted vision showing interesting
indentations and dark mottling S of center, all the way to the S and SW edges.
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