(IAAC) NGC 4151, NGC 4156 galaxy pair; 20" Dobsonian

Observer: Nick Martin
Your skills: Intermediate
Date/time of observation: 27/02/2001 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: NGC 4151, NGC 4156
Object type: External galaxy pair.
Class: SAB, SB 
Position: 12 10.5, +39 24:
          12 10.8, +39 28
Constellation:  Canes venatici
Data: Mag : 10.4  Size 5.9 ' x  4.4 '
      Mag: 13.0   Size  1.5' x 1.3'
Object Rating: B
Description: A pleasant galaxy pair consisting of a large bright galaxy with
a bright central core and stellar nucleus, NGC 5151, and the smaller fainter
NGC 4156.
4151 has a brighter bar of nebulosity around the stellar nucleus and
structure to the north of the core. There is a slight but definite
brightening in the halo WNW-W of the core, a broad brighter patch on the
following edge and on the outer edge of the visible part a brighter patch of
nebulosity curls around toward a fainter star to the north.
NGC4156 is a pleasant little galaxy, an elliptical glow with a central
condensation, which fades gradually outward. 
Nick Martin, Bonnyton House, By Ayr, Ayrshire KA6 7EW ,Scotland, UK.
 Latitude 55 24'56" Longitude 4 26' 00".
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