Abell 63

Abell 63 is a planetary nebula with an eclipsing binary central star system in the northern constellation of Sagitta.

Based on parallax measurements of the central star, it is located at a distance of approximately 8,810 light years from the Sun.

[3] The nuclear star system is the progenitor of the nebula and it has a combined apparent visual magnitude of 14.67.

The bright central rim has faint extensions leading to end caps; the primary axis of the tube being aligned along a position angle of 34°.

The primary is an O-type subdwarf star (sdO) that has passed through the asymptotic giant branch stage, during which it ejected the surrounding planetary nebula.

A visual band light curve for UU Sagittae. The main plot, plotted from data published by Pollacco and Bell (1993), [ 11 ] shows the full light curve. The inset plot, plotted from data published by Bell et al. (1994), [ 12 ] shows primary eclipse on an expanded horizontal scale.