De Vaucouleurs Atlas Type: SAB(rs)bc + SA(rs)a

Filter: R

Telescope: Keck II 10-m
North up , East left
Field Dimensions: 6.1 x 7.5 arcminutes

RC3 Type: SAB(s)c+SA0⁺ pec
RSA Type: -----
Surface Brightness Range Displayed: 19.0-28.0 mag per square arcsec
Absolute Blue Magnitude: -21.8

De Vaucouleurs Atlas Description:

The two components of this exotic pair in the Hercules Cluster (A2151) both show signs of interaction. The brighter component, NGC 6040 B, is a face-on Sa with a weak inner pseudoring ; its outer spiral structure is also partly ring-like. NGC 6040 A looks tidally distorted because its inner section looks more edge-on than its main outer arm. We suspect an inner ring and possibly a weak bar or oval in the inner section.