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R Monocerotis

The heavy, young star R Mon sits at the head of the cometary nebula NGC 2261, which is also known as Hubble's Variable Nebula. It is surrounded by a dust disk with the size of our solar system. The big star has a smaller, invisible companion with probably the same age.

Constellation: Monoceros
Age: 300 000 years
Distance: 2500 light-years
Visual magnitude: 10.4 (10 - 12)
Space between R Monocerotis A and B: 500 AU

R Monocerotis A

Spectral class: A3e - Fpe
Luminosity: 43 000 * Sun
Mass: 10 * Sun
Diameter: 2 * Sun
  

R Monocerotis B


Luminosity: 50 * Sun
Mass: 1.5 * Sun

Back: List of big and giant stars part 2

02/20/2007

     R Monocerotis
Photo: NASA and The Hubble Heritage Team (AURA/STScI)
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