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Beta Monocerotis

11 Monocerotis

Blue main sequence star in Monoceros

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Proper Name	None
Bayer Designation	Beta Monocerotis
Flamsteed Number	11 Monocerotis
HR (BSC)	2356 (A), 2356 (B), 2358 (C)
HD	45725 (A), 45726 (B), 45727 (C)
Constellation	Monoceros
Right Ascension	6h 28m 49s (A), 6h 28m 49s (B), 6h 28m 50s (C)
Declination	-7° 1' 59" (A), -7° 2' 4" (B), -7° 2' 5" (C)
Distance	677 light years 207 parsecs
Magnitude	Apparent: +4.63 (A), +5.01 (B), +5.34 (C) Absolute: -1.95 (A), -1.57 (B), -1.24 (C)
Spectral Class	B3Ve blue main sequence star (A) B2Vne blue main sequence star (B) B3V:nne blue main sequence star (C)
Optimum Visibility	January

A distant star system nearly seven hundred light years from Earth's Solar System. Beta Monocerotis is a ternary system, consisting of two blue dwarf stars orbiting one another, and also a third, fainter companion star.

The three stars of the Beta Monocerotis system appear as a single bright source in the centre of this image. Zooming in closely, it is possible to see that the diffraction spikes (the 'arms' of the cross-shaped artefact) are actually made up from multiple sources of light, in particular Beta Monocerotis A and C, the most widely separated stars of the system. Imagery provided by Aladin sky atlas

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