Star in the constellation Canis Major
! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000.0
       Equinox J2000.0 (ICRS)
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
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Xi2 Canis Majoris, which is Latinized from ξ2 Canis Majoris, is an astrometric binary star system in the southern constellation of Canis Major. With an apparent visual magnitude of +4.54, it is visible to the naked eye. Based upon an annual parallax shift of , the system is approximately 390 light years distant from Earth. It is receding with a radial velocity of +26 km/s.
The binary nature of this system was determined based on changes in the proper motion of the visible component. Buscombe (1962) gave the white-hued primary a stellar classification of A0 V, indicating it is an A-type main-sequence star. However, Houk and Smith-Moore (1978) list it with a class of A0 III, which would match a more evolved giant star, also of the A-type. It is 339 million years old with a high rate of spin, having a projected rotational velocity of 145 km/s. The star is radiating 224 times the Sun's luminosity from its photosphere at an effective temperature of 8,799 K.
References.
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