NGC 151. - This galaxy has several points of
similarity to
NGC 2532
and should probably be classified as an SBb(r). There is a thin nearly
complete bright ring and narrow bright arms. In both galaxies the
bright blue arms define the spiral pattern better than the dust, which
is very difficult to detect when the arms are so thin. The HII regions
define the arms fairly well; however, two of the regions brighter in
H
appear to be interarm objects
immersed in the darkest of the dust
lanes (these lie to the north of the inner ring). Note the asymmetry
of the two arms - the one to the east is relatively regular; the one
to the west appears as several fragments rich in HII regions, similar
to the appearance of M81.
The velocity of NGC 151 is not in de Vaucouleurs's catalog, but it
is assumed to be about 4000 km s-1 because the HII regions appear on
the 
6650 photograph rather than the
6563 one. If this velocity is
correct, the system must be similar in size to
NGC 3646 but of a lower
luminosity class.
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