De Vaucouleurs Atlas Type: SB(rs)b
Telescope: KPNO 0.9-m
North up , East left
Field Dimensions: 8.1 x 6.1 arcminutes
RC3 Type: SB(rs)b
RSA Type: SBb(rs)I-II
Surface Brightness Range Displayed: 19.0-26.0 mag per square arcsec
Absolute Blue Magnitude: -20.2
Elmegreen Spiral Arm Class: AC 5
De Vaucouleurs Atlas Description:
This galaxy provides a very good prototype of the SB(rs)b type of galaxy. The inner pseudoring is made of two spiral arms that arc from the bar minor axis zone around the ends of the bar. Thus, the inner ring is weak in the quadrants trailing the bar axis. The bar is well-defined and appears to include a complex dust pattern with one strong and broad leading dust lane on the west side. There is no nuclear ring in blue light. The outer arms are extensive and patchy, and do not form an outer pseudoring. The arm multiplicity also increases at large radii.
NGC 4548 , a Virgo Cluster member, is classified as an anemic spiral by Koopmann and Kenney (2004), implying it has a low normalized massive star formation rate for its type.