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HD 93129

A double star of two extremely huge blue stars. Star A is supposedly the biggest and therefore hottest and most luminous known main sequence star. Its surface temperature is 52 000 kelvin. The star lies in the Carina Nebula near Eta Carinae.

Constellation: Carina
Age: < 2 million years
Distance: circa 7500 light-years
Space between HD 93129 A and B: 8000 AU
Orbit period of HD 93129 A and B: > 50 000 years

HD 93129 A

Spectral class: O3
Visual magnitude: 7.3
Luminosity: circa 3 million * Sun
Mass: 120 * Sun
Diameter: 25 * Sun
 

HD 93129 B

Spectral class: O3
Visual magnitude: 8.8
Luminosity: circa 1 million * Sun
Mass: 80 * Sun

Back: List of big and giant stars part 2
    HD 93129A and der Schlüssellochnebel
In the middle is HD 93129. Down left is Eta Carinae. Near this is the famous Keyhole Nebula.
Photo: ESO Online Digitized Sky Survey

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