Alpha Monocerotis

Alpha Monocerotis
	Location of α Monocerotis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Monoceros
Right ascension	07h 41m 14.8324s
Declination	–09° 33′ 04.071″
Apparent magnitude (V)	3.94
Characteristics
Spectral type	K0 III
B−V color index	1.022
Astrometry
Radial velocity (Rv)	+10.50 km/s
Distance	144 ly ; (44.2 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 a star in the equatorial constellation of Monoceros.

Alpha Monocerotis is the brightest star in the constellation Monoceros ,It is nearing the end of its life. Internal changes have caused the star to puff up gas.

It is a giant star with a stellar classification of K0 III^[1] and is of apparent magnitude 3.93. It is approximately 144 light years from Earth.

References

^ ^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.

External links

SIMBAD Query Result

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[aaa454_3_943-1] 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.

[aaa458_2_609-2] ^ ^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.

[aaa421_241-3] 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 14.8324^s
Declination	–09° 33′ 04.071″
Apparent magnitude (V)	3.94^[1]
Characteristics
Spectral type	K0 III^[1]
B−V color index	1.022^[1]
Astrometry

Radial velocity (R_v)	+10.50^[1] km/s
Distance	144 ly (44.2 pc)
Absolute magnitude (M_V)	0.71 ± 0.08^[2]

Details

Mass	2.02 ± 0.29^[2] `M`_☉
Radius	10.1 ± 0.5^[2] `R`_☉
Surface gravity (log g)	2.71 ± 0.09^[2] cgs
Temperature	4,879^[2] K
Metallicity [Fe/H]	−0.01^[2] dex
Rotation	326 days^[3]
Rotational velocity (v sin i)	1.9^[3] km/s
Age	1.18 ± 0.42^[2] Gyr

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