Shapley 1 in the constellation Norma (the Carpenter's Square)

This planetary nebula is an almost perfect circular ring in the sky. The age of the nebula was determined to be about 8700 years.

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Optics: Planewave CDK 12.5 with Televue 0.8x reducer
Aperture: 318 mm
Focal Length: 2030 mm
Camera: Canon EOS 700Dac
Exposure: 24 x 300 s
Location: Chamaeleon Observatory, Onjala Lodge, Namibia
Processing: Nebulosity, StarTools, Starnet++, Photoshop
Diameter:1.5 light years
Distance:4,900 light years
annotated image

image field in the sky