Shapley 1. Photo by David Malin.
Shapley 1 is an annular planetary nebula in the constellation Norma. It was discovered by Harlow Shapley in 1936. Shapley 1 is unusual among planetaries in that it is neither bipolar nor a simple sphere of gas. Most ring-like planetary nebulae really consist of spherical shells and only appear annular because we are looking through a greater thickness of gas at the edge of the shell. Shapley 1, however, seems to be a true torus (doughnut-shape) seen face-on. Close inspection reveals a faint outer halo.
|visual magnitude||nebula: 12.6,
central star: 14
|distance||~1,000 light-years (300 pc)|
|position||R.A. 15h 51m 41s;
Dec. 11° -51°' 31' 29"
|other designations||PLN 329+2.1|