19 Monocerotis

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19 Monocerotis
Monoceros constellation map.svg
Red circle.svg

Location of 19 Monocerotis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 07h 02m 54.77667s[1]
Declination −4° 14′ 21.2377″[1]
Apparent magnitude (V) 5.00[2]
Spectral type B1V[3]
U−B color index -0.93[2]
B−V color index -0.20[2]
Radial velocity (Rv) +24.80[4] km/s
Proper motion (μ) RA: -5.05[1] mas/yr
Dec.: +2.24[1] mas/yr
Parallax (π) 2.68 ± 0.22[1] mas
Distance 1,220 ± 100 ly
(370 ± 30 pc)
Absolute magnitude (MV) -2.85[5]
Mass 12.3[6] M
Luminosity 4817[5] L
Surface gravity (log g) 3.662[7] cgs
Temperature 25,400[8] K
Rotational velocity (v sin i) 270[9] km/s
Other designations
BD-04 1788, FK5 2547, GC 9293, HIP 33971, HR 2648, HD 52918, SAO 134106, V637 Mon
Database references

19 Monocerotis is a class B1V[3] (blue main-sequence) star in the constellation Monoceros. Its apparent magnitude is 5.00[2] and it is approximately 1220 light years away based on parallax.[1]

It is a Beta Cephei variable, ranging from 5.01 to 4.96 magnitude with a period of 0.19 days.[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. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  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. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883Freely accessible. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  7. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384Freely accessible. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. 
  8. ^ Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335Freely accessible. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355.  Vizier catalog entry
  9. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573: 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590. 
  10. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S.