description Box Nebula Overview
The Box Nebula is the planetary nebula NGC 6309 in the constellation Ophiuchus. Wilhelm Tempel discovered it in 1876. It is an evolved-star remnant formed from gas expelled by a dying star and later illuminated by the exposed hot stellar core; its structure is described as quadrupolar, with two pairs of opposing lobes that contribute to its box-like appearance.
help Box Nebula FAQ
What is the Box Nebula's astronomical designation?
The Box Nebula is planetary nebula NGC 6309 in the constellation Ophiuchus. It is an evolved-star remnant made from gas expelled by a dying star.
Who discovered the Box Nebula?
Wilhelm Tempel discovered the object in 1876. It was later catalogued as NGC 6309.
Why is it called the Box Nebula?
The nickname refers to its box-like or quadrilateral visual structure. Its shape comes from the arrangement of glowing gas around the exposed hot stellar core.
What powers the glow of NGC 6309?
The nebula shines because gas expelled by the dying star is illuminated by the exposed hot stellar core. It is therefore a planetary nebula, not a planet or a cloud forming a new star.
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