PK 343-00.1 / Nova Scorpii 1437 in the constellation Scorpius

In 1437 Korean astronomers observed a new star in the constellation Scorpio for two weeks. They discovered a nova, a brightness burst in a close binary system consisting of a white dwarf star and its companion. The white dwarf continuously collects hydrogen gas from the companion star. When the collected gas exceeds a certain mass, the nuclear fusion process in the hydrogen ignites abruptly and blasts parts of the collected gas layers into space.

larger image
Optics: Planewave CDK 12.5 with Televue 0.8x reducer
Aperture: 318 mm
Focal Length: 2030 mm
Camera: QHY163M
Exposure: R:G:B 4:4:4 x 300 s
Hα 34 x 600 s
Location: Chamaeleon Observatory, Onjala Lodge, Namibia
Processing: Nebulosity, StarTools, Starnet++, Photoshop
Diameter:1.8 light years
Distance:3,370 light years
annotated image

image field in the sky