Lambda Canis Majoris

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Lambda Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension  06h 28m 10.20747s[1]
Declination −32° 34′ 48.2455″[1]
Apparent magnitude (V) +4.48[2]
Spectral type B4 V[3]
U−B color index −0.61[2]
B−V color index −0.17[2]
Radial velocity (Rv)+41.0±4.1[4] km/s
Proper motion (μ) RA: −14.41[1] mas/yr
Dec.: +25.21[1] mas/yr
Parallax (π)7.70 ± 0.16[1] mas
Distance424 ± 9 ly
(130 ± 3 pc)
Absolute magnitude (MV)−0.85[5]
Mass5.7±0.3[6] M
Luminosity560[7] L
Surface gravity (log g)3.93[8] cgs
Temperature16,300[3] K
Rotational velocity (v sin i)102±9[3] km/s
Age39.8±19.1[6] Myr
Other designations
λ CMa, CD−32°3066, GC 8410, HD 45813, HIP 30788, HR 2361, SAO 196857[9]
Database references

Lambda Canis Majoris (λ Canis Majoris) is a solitary,[10] blue-white hued star in the constellation Canis Major. Lambda CMa is visible to the naked eye with an apparent visual magnitude of +4.48.[2] Based upon an annual parallax shift of 7.70 mas as seen from Earth,[1] this star is located about 424 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.14 due to interstellar dust.[5]

This is a B-type main-sequence star with a stellar classification of B4 V;[3] the star is roughly 40 million years old,[6] and is spinning with a projected rotational velocity of 102 km/s.[3] It has about 5.7[6] times the mass of the Sun and is radiating 560[7] times the Sun's luminosity at an effective temperature of 16,300 K.[3]


  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.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. ^ a b c d e f Bragança, G. A.; et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", The Astronomical Journal, 144 (5): 10, arXiv:1208.1674, Bibcode:2012AJ....144..130B, doi:10.1088/0004-6256/144/5/130, 130.
  4. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
  6. ^ a b c d Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. ^ Castelli, F. (November 1991), "Effective temperature and gravity c0 and beta indices for B-type stars", Astronomy and Astrophysics, 251: 106, Bibcode:1991A&A...251..106C.
  9. ^ "lam CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-07.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.

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