De Vaucouleurs Atlas Type: SB(rs)ab
Telescope: CTIO 1.5-m
North left , East down
Field Dimensions: 2.9 x 2.9 arcminutes
RC3 Type: SB(rs)b
RSA Type: -----
Surface Brightness Range Displayed: 19.0-26.0 mag per square arcsec
Absolute Blue Magnitude: -21.1
De Vaucouleurs Atlas Description:
The well-defined, slightly elongated inner ring is broken in the areas perpendicular to the bar axis. The ring is therefore like two long, curved brackets around the bar, which we recognize as variety (rs). The bar mostly fills the ring along its projected major axis, and no dust lanes or star formation characterize this region. Of particular interest is the multi-armed spiral pattern outside the ring. These arms are lightly patchy and do not define an outer pseudoring .
NGC 2307 is a member of a mixed morphology binary galaxy, being paired with the neighboring E galaxy NGC 2305 . Mixed morphology pairs are considered significant because they are simpler to interpret than the more typical morphologically concordant (S+S) pairs. If there is interaction-fueling of gas between the components, the direction of that fueling will be unambiguous (Domingue et al. 2003; Franco-Balderas et al. 2003).