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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
Declination	−32° 34′ 48.2455″
Apparent magnitude (V)	+4.48
Characteristics
Spectral type	B4 V
U−B color index	−0.61
B−V color index	−0.17
Astrometry
Radial velocity (Rv)	+41.0±4.1 km/s
Proper motion (μ)	RA: −14.41 mas/yr ; Dec.: +25.21 mas/yr
Parallax (π)	7.70 ± 0.16 mas
Distance	424 ± 9 ly ; (130 ± 3 pc)
Absolute magnitude (MV)	−0.85
Details
Mass	5.7±0.3 M☉
Luminosity	560 L☉
Surface gravity (log g)	3.93 cgs
Temperature	16,300 K
Rotational velocity (v sin i)	102±9 km/s
Age	39.8±19.1 Myr
Other designations
	λ CMa, CD−32°3066, GC 8410, HD 45813, HIP 30788, HR 2361, SAO 196857
Database references
SIMBAD	data

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]

References

^ ^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, S2CID 18759600.
^ ^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): 99, Bibcode:1966CoLPL...4...99J.
^ ^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, S2CID 118868235, 130.
^ 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, S2CID 119231169.
^ ^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, S2CID 119108982.
^ ^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, S2CID 118629873.
^ ^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, S2CID 118665352.
^ 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.
^ "lam CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-07.{{cite web}}: CS1 maint: postscript (link)
^ 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, S2CID 14878976.