De Vaucouleurs Atlas Type: SA(s)bc

Filter: g

Telescope: SDSS 2.5-m
North right , East up
Field Dimensions: 5.4 x 4.1 arcminutes

RC3 Type: SA(s)c
RSA Type: Sbc(s) II
Surface Brightness Range Displayed: 17.0-25.0 mag per square arcsec
Absolute Blue Magnitude: -20.7
Elmegreen Spiral Arm Class: AC 9

De Vaucouleurs Atlas Description:

NGC 3631 is a very well-defined face-on spiral. We classify it as type Sbc because of the tight wrapping of the arms and their relative smoothness.