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Rho Ophiuchi

A pair of two very similar blue stars. Both are at the end of their main sequence phase and will soon start to expand to red giants.

Constellation: Ophiuchus
Distance: 395 light-years
Orbit period of Rho Ophiuchi A and B: at least 2000 years
Space between Rho Ophiuchi A and B: at least 400 AU

Rho Ophiuchi A

Spectral class: B2
Visual magnitude: 5.0
Luminosity: 4900 * Sun
Mass: 9 * Sun
 

Rho Ophiuchi B

Spectral class: B2
Visual magnitude: 5.9
Luminosity: 2100 * Sun
Mass: 8 * Sun

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    Rho Ophiuchi
Photo: NOAO, AURA, NSF

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