Shapley 1
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Shapley 1. Photo by David Malin
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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 |
| angular diameter |
1.1' |
| distance |
~1,000 light-years (300 pc) |
| position |
R.A. 15h 51m 41s;
Dec. 11° -51°' 31' 29" |
| other designations |
PLN 329+2.1 |
Related category
• NEBULAE
AND STAR CLUSTERS
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