NGC 4485-90 - IAB(s)m pec + SAB(s)d pec

NGC 4485-90

De Vaucouleurs Atlas Type: IAB(s)m pec + SAB(s)d pec

Filter: B

Telescope: McGraw-Hill 1.3-m
North up , East left
Field Dimensions: 8.1 x 6.9 arcminutes

RC3 Type: IB(s)m+SB(s)d pec
RSA Type: S(tidal)+ScdIII pec
Surface Brightness Range Displayed: 18.5-26.0 mag per square arcsec
Absolute Blue Magnitude: -17.7

De Vaucouleurs Atlas Description:

This bright pair consists of two disturbed very late-type systems. The main component, NGC 4490 , is difficult to interpret but appears to be at least type Sd. If it is a highly inclined spiral, the type would be SAB(s)d pec, where the AB refers to a weak possible bar-like feature near the center. The main star-forming structures in NGC 4490 are ``framed" by a diffuse rectangular zone that does not look like an extended disk. An alternative interpretation of the galaxy is that it is a three-dimensional object. NGC 4485 has a smooth disk and an oval zone, which is the basis for the AB classification. There is clear tidal debris in the gap between the two galaxies.