Xi2 Canis Majoris

For other stars with this Bayer designation, see ξ Canis Majoris.
Xi2 Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension 06h 35m 03.38859s[1]
Declination −22° 57′ 53.2913″[1]
Apparent magnitude (V) +4.54[2]
Characteristics
Spectral type A0 V[3][4] or A0 III[5]
U−B color index −0.01[2]
B−V color index −0.06[2]
Astrometry
Radial velocity (Rv)+26.0±4.2[6] km/s
Proper motion (μ) RA: +15.437[1] mas/yr
Dec.: +18.682[1] mas/yr
Parallax (π)8.3465 ± 0.2721 mas[1]
Distance390 ± 10 ly
(120 ± 4 pc)
Absolute magnitude (MV)+0.94[7]
Details
Radius2.7[8] R☉
Luminosity224[9] L☉
Temperature8,799[9] K
Rotational velocity (v sin i)145[10] km/s
Age339[7] Myr
Other designations
ξ2 CMa, 5 Canis Majoris, BD−22°1458, FK5 249, GC 8577, HD 46933, HIP 31416, HR 2414, SAO 171982[11]
Database references
SIMBADdata

Xi2 Canis Majoris, which is Latinized from ξ2 Canis Majoris, is an astrometric binary[4] star system in the southern constellation of Canis Major. With an apparent visual magnitude of +4.54,[2] it is visible to the naked eye. Based upon an annual parallax shift of 8.35 mas,[1] the system is approximately 390 light years distant from Earth. It is receding with a radial velocity of +26 km/s.[6]

The binary nature of this system was determined based on changes in the proper motion of the visible component.[12] Buscombe (1962) gave the white-hued primary a stellar classification of A0 V,[3] indicating it is an A-type main-sequence star. However, Houk and Smith-Moore (1978) list it with a class of A0 III,[5] which would match a more evolved giant star, also of the A-type. It is 339[7] million years old with a high rate of spin, having a projected rotational velocity of 145 km/s.[10] The star is radiating 224[9] times the Sun's luminosity from its photosphere at an effective temperature of 8,799 K.[9]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Buscombe1962 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference belle2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference aj129_5_2420 was invoked but never defined (see the help page).