10 Canis Majoris

10 Canis Majoris

A light curve for FT Canis Majoris from Hipparcos data, adapted from Lefèvre et al. (2009)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 06h 44m 28.46710s[2]
Declination −31° 04′ 13.8923″[2]
Apparent magnitude (V) 5.23[3] (5.13–5.44)[4]
Characteristics
Spectral type B2 V[5] or B2 IIIe[6]
B−V color index −0.127±0.005[3]
Variable type Be[4]
Astrometry
Radial velocity (Rv)+34.0±4.2[7] km/s
Proper motion (μ) RA: −3.286[2] mas/yr
Dec.: +4.201[2] mas/yr
Parallax (π)1.6454 ± 0.0722 mas[2]
Distance1,980 ± 90 ly
(610 ± 30 pc)
Details
Mass19.2±0.1[8] M☉
Radius10.0[9] R☉
Luminosity44,463+35,336
−19,689[10] L☉
Surface gravity (log g)3.76±0.17[10] cgs
Temperature25,350±1,030[10] K
Rotation2.63 d[11]
Rotational velocity (v sin i)205±5[12] km/s
Age8.2±0.1[8] 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[13]
Database references
SIMBADdata

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] 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.[16]

  1. ^ Cite error: The named reference Lefèvre was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Zorec2007 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference Zorec2016 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Balona1992 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Chauville2001 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).