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10 Canis Majoris
	; A light curve for FT Canis Majoris from Hipparcos data, adapted from Lefèvre et al. (2009)
Observation data; Epoch J2000 Equinox J2000
Constellation	Canis Major
Right ascension	06h 44m 28.46710s
Declination	−31° 04′ 13.8923″
Apparent magnitude (V)	5.23 (5.13–5.44)
Characteristics
Spectral type	B2 V or B2 IIIe
B−V color index	−0.127±0.005
Variable type	Be
Astrometry
Radial velocity (Rv)	+34.0±4.2 km/s
Proper motion (μ)	RA: −3.286 mas/yr ; Dec.: +4.201 mas/yr
Parallax (π)	1.6454 ± 0.0722 mas
Distance	1,980 ± 90 ly ; (610 ± 30 pc)
Details
Mass	19.2±0.1 M☉
Radius	10.0 R☉
Luminosity	44,463+35,336; −19,689 L☉
Surface gravity (log g)	3.76±0.17 cgs
Temperature	25,350±1,030 K
Rotation	2.63 d
Rotational velocity (v sin i)	205±5 km/s
Age	8.2±0.1 Myr
Other designations
	10 CMa, FT Canis Majoris, CD−30°3484, GC 8827, HD 48917, HIP 32292, HR 2492, SAO 197149, CCDM 06445-3104, WDS J06445-3104
Database references
SIMBAD	data

10 Canis Majoris is a single^[14] variable star in the southern constellation of Canis Major,^[13] located roughly 1,980 light years away from the Sun.^[2] It has the variable star designation FT Canis Majoris; 10 Canis Majoris is the Flamsteed designation. This body is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.23.^[3] It is moving away from the Earth with a heliocentric radial velocity of +34 km/s.^[7]

This is a massive Be star^[9] with a stellar classification of B2 V,^[5] matching a B-type main-sequence star. Hiltner et al. (1969) found a giant class of B2 IIIe,^[6] which is still in use with some studies.^[14]^[4] The star is spinning rapidly with a projected rotational velocity of 205 km/s^[12] and a rotational period of 2.63 days.^[11] This is giving it an oblate shape with an equatorial bulge that is 5% larger than the polar radius.^[15] The axis of rotation is inclined by an angle of 45° to the line of sight from the Earth.^[9]

In 1968, Alejandro Feinstein announced that the star is variable, based on observations from 1963-1965.^[16] It was given its variable star designation in 1973.^[17] Samus et al. (2017) classify it as a Be-type variable star that ranges from a peak visual magnitude of 5.13 down to 5.44 with a rotationally-modulated period of 2.63 days.^[4]^[11]

10 Canis Majoris is 8.2^[8] million years old with 19.2^[8] times the mass of the Sun and 10^[9] times the Sun's radius. It is radiating around 44,000^[10] times the luminosity of the Sun from its photosphere at an effective temperature of 25,000 K.^[10] There is a magnitude 12.58 visual companion at an angular separation of 37.3″ along a position angle of 99°, as of 2015.^[18]

References

^ Lefèvre, L.; Marchenko, S. V.; Moffat, A. F. J.; Acker, A. (November 2009), "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Astronomy & Astrophysics, 507 (2): 1141–1201, Bibcode:2009A&A...507.1141L, doi:10.1051/0004-6361/200912304.
^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b ^c ^d Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/s1063772917010085, S2CID 125853869.
^ ^a ^b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
^ ^a ^b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
^ ^a ^b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ ^a ^b ^c ^d Tetzlaff, N.; et al. (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 ^c ^d Zorec, J.; et al. (July 2007), "Be star disc characteristics near the central object", Astronomy and Astrophysics, 470 (1): 239–247, Bibcode:2007A&A...470..239Z, doi:10.1051/0004-6361:20066615, hdl:11336/38181.
^ ^a ^b ^c ^d ^e Zorec, J.; et al. (November 2016), "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity", Astronomy & Astrophysics, 595: 26, Bibcode:2016A&A...595A.132Z, doi:10.1051/0004-6361/201628760, hdl:11336/37946.
^ ^a ^b ^c Balona, L. A.; et al. (February 1992), "Intensive photometry of southern Be variables. II - Summer objects", Astronomy and Astrophysics Supplement Series, 92 (3): 533–563, Bibcode:1992A&AS...92..533B.
^ ^a ^b Chauville, J.; Zorec, J.; Ballereau, D.; Morrell, N.; Cidale, L.; Garcia, A. (November 2001), "High and intermediate-resolution spectroscopy of Be stars 4481 lines", Astronomy and Astrophysics, 378: 861–882, Bibcode:2001A&A...378..861C, doi:10.1051/0004-6361:20011202, hdl:11336/36962.
^ ^a ^b "10 CMa", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved April 27, 2019.
^ ^a ^b 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.
^ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
^ Feinstein, A. (1968). "A Survey of Southern Be Stars. II. Photometric data". Zeitschrift für Astrophysik. 68: 29–47. Bibcode:1968ZA.....68...29F. Retrieved 1 January 2025.
^ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 834: 1–22. Bibcode:1973IBVS..834....1K. Retrieved 1 January 2025.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

[Lefèvre-1] Lefèvre, L.; Marchenko, S. V.; Moffat, A. F. J.; Acker, A. (November 2009), "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Astronomy & Astrophysics, 507 (2): 1141–1201, Bibcode:2009A&A...507.1141L, doi:10.1051/0004-6361/200912304.

[GaiaEDR3-2] ^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[Anderson2012-3] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.

[Samus2017-4] Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/s1063772917010085, S2CID 125853869.

[houk1979-5] Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.

[Hiltner1969-6] Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.

[deBruijne2012-7] Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.

[Tetzlaff2011-8] Tetzlaff, N.; et al. (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.

[Zorec2007-9] Zorec, J.; et al. (July 2007), "Be star disc characteristics near the central object", Astronomy and Astrophysics, 470 (1): 239–247, Bibcode:2007A&A...470..239Z, doi:10.1051/0004-6361:20066615, hdl:11336/38181.

[Zorec2016-10] Zorec, J.; et al. (November 2016), "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity", Astronomy & Astrophysics, 595: 26, Bibcode:2016A&A...595A.132Z, doi:10.1051/0004-6361/201628760, hdl:11336/37946.

[Balona1992-11] Balona, L. A.; et al. (February 1992), "Intensive photometry of southern Be variables. II - Summer objects", Astronomy and Astrophysics Supplement Series, 92 (3): 533–563, Bibcode:1992A&AS...92..533B.

[Chauville2001-12] Chauville, J.; Zorec, J.; Ballereau, D.; Morrell, N.; Cidale, L.; Garcia, A. (November 2001), "High and intermediate-resolution spectroscopy of Be stars 4481 lines", Astronomy and Astrophysics, 378: 861–882, Bibcode:2001A&A...378..861C, doi:10.1051/0004-6361:20011202, hdl:11336/36962.

[SIMBAD-13] "10 CMa", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved April 27, 2019.

[Eggleton2008-14] 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.

[vanBelle2012-15] van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.

[Feinstein1968-16] Feinstein, A. (1968). "A Survey of Southern Be Stars. II. Photometric data". Zeitschrift für Astrophysik. 68: 29–47. Bibcode:1968ZA.....68...29F. Retrieved 1 January 2025.

[Kukarkin1973-17] Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 834: 1–22. Bibcode:1973IBVS..834....1K. Retrieved 1 January 2025.

[WDSC2014-18] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

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10 Canis Majoris

References

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