Back 12 Canis Majoris Afrikaans HK Canis Majoris AST HK Canis Majoris Catalan HD49333 CE HK Canis Majoris Spanish ۱۲ سگ بزرگ Persian 12 Canis Majoris Italian 12 Большого Пса Russian 12 Canis Majoris Swedish HD49333 Tatar

12 Canis Majoris

12 Canis Majoris

A visual band light curve for HK Canis Majoris (2020)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 06h 47m 01.48353s[2]
Declination −21° 00′ 55.4517″[2]
Apparent magnitude (V) +6.07[3]
Characteristics
Spectral type B7 II/III[4] or B5 V[5]
B−V color index −0.159±0.004[3]
Variable type SX Ari[6]
Astrometry
Radial velocity (Rv)+16.4±2.5[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
Distance707 ± 8 ly
(217 ± 3 pc)
Absolute magnitude (MV)−0.81[3]
Details
Mass4.8[7] M☉
Radius2.73[8] R☉
Luminosity537[9] L☉
Surface gravity (log g)4.23[5] cgs
Temperature15,830±60[9] K
Metallicity [Fe/H]−0.37[10] dex
Rotation2.18045 d[7]
Rotational velocity (v sin i)65[7] km/s
Age134[11] Myr
Other designations
12 Cep, HK CMa, BD−20°1576, FK5 817, GC 8884, HD 49333, HIP 32504, HR 2509, SAO 172318[12]
Database references
SIMBADdata

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]

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[15] of the helium–weak variety (CP4), with the spectrum displaying evidence for vertical stratification of helium in the atmosphere.[16] 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 15,830 K.

  1. ^ Cite error: The named reference Bernhard was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Cidale2007 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference schultz2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Shulyak2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Netopil2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mosser2005 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference gontcharov2012 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Feinstein1979 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Levato1984 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Bailey2013 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Farthmann1994 was invoked but never defined (see the help page).

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