Pi Canis Majoris

Pi Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension 06h 55m 37.43099s[1]
Declination −20° 08′ 11.3902″[1]
Apparent magnitude (V) +4.69[2]
Characteristics
Spectral type F1.5 V[3]
U−B color index +0.06[2]
B−V color index +0.36[2]
Astrometry
Radial velocity (Rv)−37.9±5.5[4] km/s
Proper motion (μ) RA: +51.50[1] mas/yr
Dec.: +39.58[1] mas/yr
Parallax (π)33.80 ± 0.24 mas[1]
Distance96.5 ± 0.7 ly
(29.6 ± 0.2 pc)
Absolute magnitude (MV)+2.06[5]
Details
π CMa A
Mass1.32[6] M☉
Luminosity9[7] L☉
Surface gravity (log g)3.91[6] cgs
Temperature6,863±233[6] K
Metallicity [Fe/H]−0.18[3] dex
Rotational velocity (v sin i)91.7±4.6[5] km/s
Age763[6] Myr
Other designations
π CMa, 19 Canis Majoris, BD−19°1610, HD 51199, HIP 33302, HR 2590, SAO 172579, ADS 5602, CCDM 06556-2008[8]
Database references
SIMBADdata

Pi Canis Majoris (π Canis Majoris; Latin for 'Greater Dog') is a binary star[9] system in the southern constellation of Canis Major. It is visible to the naked eye, having an apparent visual magnitude of +4.69.[2] Based upon an annual parallax shift of 33.80 mas as seen from Earth,[1] this system is located 96.5 light years from the Sun. The star is moving in the general direction of the Sun with a radial velocity of −37.9 km/s. It will make its closest approach in around 733,000 years when it comes within 23 ly (7 pc).[4]

The brighter primary, component A, is an F-type main-sequence star with a stellar classification of F1.5 V.[3] It is a periodic variable star with a frequency of 11.09569 cycles per day (2.16 hours per cycle) and an amplitude of 0.0025 in magnitude.[10] The star has an estimated 1.32[6] times the mass of the Sun and is radiating nine[7] times the Sun's luminosity from its photosphere at an effective temperature of around 6,863 K.[6] It displays a strong infrared excess at a wavelength of 24 μm and a weaker excess at 70 μm, indicating the presence of a circumstellar disk of dust with a temperature of 188 K, orbiting at 6.7 AU from the host star.[11]

The magnitude 9.6 companion, component B, lies at an angular separation of 11.6 arc seconds from the primary as of 2008.[9] Their projected separation is about 339 AU.[11]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 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 c Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aa575_A35 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  8. ^ "pi. CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-03.{{cite web}}: CS1 maint: postscript (link)
  9. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference koen2002 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Trilling2007 was invoked but never defined (see the help page).