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Alpha Monocerotis

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Alpha Monocerotis
Diagram showing star positions and boundaries of the Monoceros constellation and its surroundings
Location of α Monocerotis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Monoceros
Right ascension 07h 41m 14.833s[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 (Rv)+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]
Distance148 ± 1 ly
(45.3 ± 0.4 pc)
Absolute magnitude (MV)0.71 ± 0.08[3]
Details
Mass2.02 ± 0.29[3] M☉
Radius10.1 ± 0.5[3] R☉
Surface gravity (log g)2.71 ± 0.09[3] cgs
Temperature4,879[3] K
Metallicity [Fe/H]−0.01[3] dex
Rotation326 days[4]
Rotational velocity (v sin i)1.9[4] km/s
Age1.18 ± 0.42[3] 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

  1. ^ 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
  2. ^ 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.
  3. ^ 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.
  4. ^ 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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