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Nova Muscae 1991

In 1991 in the double system GU Muscae a nova occurred, which could almost only be perceived in X-rays. The involved compact object (star B) isn't a white dwarf, which would be usual with novae, but a black hole. Its partner (star A) is a red giant.

Constellation: Musca
Distance: 8150 light-years
Visual magnitude: 13.6
Orbit period of GU Muscae A and B: 10.4 days

GU Muscae A

Spectral class: K5
Mass: 3.1 * Sun

GU Muscae B

Mass: 6 * Sun

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    Nova Muscae 1991
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