20 Monocerotis

From Wikipedia, the free encyclopedia
Jump to: navigation, search
20 Monocerotis
Monoceros constellation map.svg
Red circle.svg

Location of 20 Monocerotis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 07h 10m 13.68165s[1]
Declination −4° 14′ 13.5861″[1]
Apparent magnitude (V) 4.92[2]
Spectral type K0III[3]
U−B color index +0.78[2]
B−V color index +1.03[2]
Radial velocity (Rv) +77.74[4] km/s
Proper motion (μ) RA: -0.47[1] mas/yr
Dec.: +217.36[1] mas/yr
Parallax (π) 16.08 ± 0.23[1] mas
Distance 203 ± 3 ly
(62.2 ± 0.9 pc)
Absolute magnitude (MV) 0.94[5]
Mass 1.82[6] M
Radius 10[6] R
Luminosity 52.05[5] L
Surface gravity (log g) 2.63[7] cgs
Temperature 4,750[8] K
Metallicity [Fe/H] -0.31[7] dex
Rotational velocity (v sin i) < 1.0[9] km/s
Other designations
BD-04 1840, CCDM J07102-0414A, FK5 1186, GC 9477, HIP 34622, HR 2701, HD 54810, SAO 134282, WDS J07102-0414A
Database references

20 Monocerotis is a class K0III[3] (orange giant) star in the constellation Monoceros. Its apparent magnitude is 4.92[2] and it is approximately 203 light years away based on parallax.[1]

In addition to the primary, three companions have been reported: B, with magnitude 12.93 and separation 67.8", C, with magnitude 10.16 and separation 167.9", and D, with magnitude 12.46 and separation 102.3".[10]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H. 
  4. ^ Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv:1410.6422Freely accessible. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474.  Vizier catalog entry
  5. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  6. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A.  Vizier catalog entry
  7. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491Freely accessible. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. 
  8. ^ Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785. arXiv:1607.00619Freely accessible. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078.  Vizier catalog entry
  9. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474Freely accessible. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.  Vizier catalog entry
  10. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry