Alpha Monocerotis

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α Monocerotis
Monoceros constellation map.svg
Red circle.svg

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[1] mas
Distance 148 ± 1 ly
(45.3 ± 0.4 pc)
Absolute magnitude (MV) 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, SAO 134986.
Database references
SIMBAD data

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[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. 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, Bibcode:2006A&A...454..943H, arXiv:astro-ph/0604502Freely accessible, 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, Bibcode:2006A&A...458..609D, arXiv:astro-ph/0608160Freely accessible, 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. 

External links[edit]