NGC 4027 - SB(s)dm

NGC 4027

De Vaucouleurs Atlas Type: SB(s)dm

Filter: B

Telescope: KPNO 0.9-m
North left , East down
Field Dimensions: 4.1 x 3.1 arcminutes

RC3 Type: SB(s)dm
RSA Type: Sc(s)II.2
Surface Brightness Range Displayed: 18.5-26.0 mag per square arcsec
Absolute Blue Magnitude: -20.5
Elmegreen Spiral Arm Class: AC 4

De Vaucouleurs Atlas Description:

NGC 4027 shows a small, but very conspicuous bar imbedded within a strongly asymmetric disk. The north arm is much broader and more extensive than the south arm, although the appearance could be impacted partly by dust. Originally, de Vaucouleurs, de Vaucouleurs, and Freeman (1968) believed this to be a late-type barred spiral where the bar is offset from the rotation center of the disk. However, later H-alpha Fabry-Perot observations (Pence et al. 1988) showed that the rotation center is coincident with the center of the bar.

The asymmetry in NGC 4027 is thought to be due to interaction between NGC 4027 and its morphologically similar companion NGC 4027 A (Phookun et al. 1992).