12 Canis Majoris

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Template:Short description

12 Canis Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +6.07[3]
Characteristics
Spectral type B7 II/III[4] or B5 V[5]
B−V Template:Engvar Script error: No such module "val".[3]
Variable type SX Ari[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: −14.568[2] mas/yr
Dec.: +5.778[2] mas/yr
Parallax (π)4.6155±0.0543 mas
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.81[3]
Details
Mass4.8[7] Template:Solar mass
Radius2.73[8] Template:Solar radius
Luminosity537[9] Template:Solar luminosity
Surface gravity (log g)4.23[5] cgs
TemperatureScript error: No such module "val".[9] K
Metallicity [Fe/H]−0.37[10] dex
RotationScript error: No such module "val".[7]
Rotational velocity (v sin i)65[7] km/s
Age134[11] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
Database references
SIMBADdata

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12 Canis Majoris is a variable star located about 707 light years away from the Sun in the southern constellation of Canis Major.[12] It has the variable star designation HK Canis Majoris; 12 Canis Majoris is the Flamsteed designation. This body is just barely visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of +6.07.[3] It is moving away from the Earth with a heliocentric radial velocity of +16 km/s.[3] This is the brightest star in the vicinity of the open cluster NGC 2287,[13] although it is probably not a member based on its proper motion.[14]

The Bayer designation ρ Canis Majoris/Rho Canis Majoris has been applied to this star in the past, but this is now rarely seen.[15] Perhaps the best-known use was by Charles Messier when describing the cluster Messier 41: "cluster of stars below Sirius, near Rho Canis Majoris".[16]

This star has a stellar classification of B7 II/III,[4] matching the spectrum of a B-type star intermediate between a giant and bright giant.[4] (Cidale et al. (2007) show a class of B5 V,[5] which would indicate it is instead a B-type main-sequence star.) It is a magnetic Bp star[17] of the helium–weak variety (CP4), with the spectrum displaying evidence for vertical stratification of helium in the atmosphere.[18]

Holger Pedersen and Bjarne Thomsen discovered that 12 Canis Majoris is a variable star, in 1977.[19] It was given its variable star designation in 1981.[20] Samus et al. (2017) classify it as an SX Arietis variable that varies in brightness by about 0.05 magnitudes over a period of 2.18045 days.[6] It has 4.8 times the mass of the Sun and 2.73[8] times the Sun's radius. The star is radiating 537 times the Sun's luminosity from its photosphere at an effective temperature of Script error: No such module "val"..

References

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  2. ↑ a b c d Template:Cite Gaia DR3
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  4. ↑ a b c Script error: No such module "citation/CS1".
  5. ↑ a b c Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b c Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ a b Template:Cite simbad
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Canis Major

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