Alpha Monocerotis

Alpha Monocerotis
	Location of α Monocerotis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Monoceros
Right ascension	07h 41m 14.833s
Declination	−09° 33′ 04.07″
Apparent magnitude (V)	3.94
Characteristics
Spectral type	K0 III
B−V color index	1.022
Astrometry
Radial velocity (Rv)	+10.50 km/s
Proper motion (μ)	RA: −74.61 ± 0.14 mas/yr ; Dec.: −19.59 ± 0.10 mas/yr
Parallax (π)	22.07 ± 0.18 mas
Distance	148 ± 1 ly ; (45.3 ± 0.4 pc)
Absolute magnitude (MV)	0.71 ± 0.08
Details
Mass	2.02 ± 0.29 M☉
Radius	10.1 ± 0.5 R☉
Surface gravity (log g)	2.71 ± 0.09 cgs
Temperature	4,879 K
Metallicity [Fe/H]	−0.01 dex
Rotation	326 days
Rotational velocity (v sin i)	1.9 km/s
Age	1.18 ± 0.42 Gyr
Other designations
	26 Monocerotis, BD–09 2172, HD 61935, HIP 37447, HR 2970, IRAS 07388-0926, SAO 134986.

Alpha Monocerotis (α Mon, α Monocerotis) is the Bayer designation for the brightest star in the equatorial constellation of Monoceros.

It is a giant star with a stellar classification of K0 III^[2] and is of apparent magnitude 3.93. It is approximately 148 light years from Earth.^[1]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
^ ^a ^b ^c ^d ^e Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946.
^ ^a ^b ^c ^d ^e ^f ^g da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105.
^ ^a ^b Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1.

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of α Monocerotis (circled)
Constellation	Monoceros
Right ascension	07^h 41^m 14.833^s^[1]
Declination	−09° 33′ 04.07″^[1]
Apparent magnitude (V)	3.94^[2]
Characteristics
Spectral type	K0 III^[2]
B−V color index	1.022^[2]
Astrometry

Radial velocity (R_v)	+10.50^[2] km/s
Proper motion (μ)	RA: −74.61 ± 0.14^[1] mas/yr Dec.: −19.59 ± 0.10^[1] mas/yr
Parallax (π)	22.07 ± 0.18 mas^[1]
Distance	148 ± 1 ly (45.3 ± 0.4 pc)
Absolute magnitude (M_V)	0.71 ± 0.08^[3]

Details

Mass	2.02 ± 0.29^[3] `M`_☉
Radius	10.1 ± 0.5^[3] `R`_☉
Surface gravity (log g)	2.71 ± 0.09^[3] cgs
Temperature	4,879^[3] K
Metallicity [Fe/H]	−0.01^[3] dex
Rotation	326 days^[4]
Rotational velocity (v sin i)	1.9^[4] km/s
Age	1.18 ± 0.42^[3] Gyr

Other designations
26 Monocerotis, BD–09 2172, HD 61935, HIP 37447, HR 2970, IRAS 07388-0926, SAO 134986.