De Vaucouleurs Atlas Type: SB(s)c

Filter: B

Telescope: USNO 1.0-m
North left , East down
Field Dimensions: 11.8 x 10.7 arcminutes

RC3 Type: SB(s)c
RSA Type: SBc(s)II
Surface Brightness Range Displayed: 21.0-27.0 mag per square arcsec
Absolute Blue Magnitude: -19.6

De Vaucouleurs Atlas Description:

NGC 7640 appears to be a highly inclined version of NGC 7479 . That it is an SB galaxy was also noted in the Hubble Atlas . The bar is viewed broadside-on, and the variety is definitely (s). Thus, the high inclination does not mitigate seriously against reliably classifying this galaxy. The appearance suggests that near-side extinction is not impacting the observed morphology as much as in other galaxies. The morphology appears to be globally two-armed, with little multi-armed structure.