De Vaucouleurs Atlas Type: SA(rs)bc
Telescope: Perkins 1.8-m
North up , East left
Field Dimensions: 3.8 x 2.8 arcminutes
RC3 Type: SA(rs)c
RSA Type: Sc(r)I-II
Surface Brightness Range Displayed: 18.0-26.0 mag per square arcsec
Absolute Blue Magnitude: -20.1
Elmegreen Spiral Arm Class: AC 9
De Vaucouleurs Atlas Description:
NGC 4651 , a member of the Virgo Cluster , has a very well-defined inner ring that is made of spiral structure and is broken in one section. We use the underline notation to indicate that the feature is more ringlike than spiral. The ring is lined by associations and is undoubtedly blue, as in NGC 5364 and NGC 7531 . The Sbc classification is based on the general openness and patchiness of the outer arms, and the significant bulge. The outer arms do not have high contrast.
Koopmann and Kenney (2004) classify the star-forming characteristics of NGC 4651 as normal, meaning it has a star formation rate similar to isolated galaxies within a similar disk radial range.