Plaskett's star

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Plaskett's Star
Observation data
Epoch J2000.0
Constellation Monoceros
Right ascension 06h 35m
Declination +06° 11'
Apparent magnitude (V) 6.05
Distance 6600 ly
(2023.52 pc)
Spectral type O8
Other designations
HR 2422, BD+6°1309, GC 8631

Plaskett's Star (formal name HR 2422 Monocerotis) is a spectroscopic binary at a distance of around 6600 light-years. It is one of the most massive binary stars known, with a total mass of about one hundred times that of the Sun.

It is named after John Stanley Plaskett, the Canadian astronomer who discovered its binary nature in 1922. The star has a visual magnitude of 6.05, and is located in the constellation of Monoceros.

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