Xi1 Canis Majoris

Xi¹ Canis Majoris

Location of ξ^1 Canis Majoris (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Centaurus
Right ascension	06^h 31^m 51.3^s
Declination	−23° 25′ 06″
Apparent magnitude (V)	+4.34
Characteristics
Spectral type	B1 III[1]
Variable type	β Cep[1]
Astrometry
Distance	2050 ± 900 ly (630 ± 280 pc)
Details
Mass	13.7 ± 0.9[1] M☉
Radius	7.1 ± 0.9[1] R☉
Luminosity	25,000[1] L☉
Surface gravity (log g)	3.83 ± 0.20[1] cgs
Temperature	27,100 ± 1,200[1] K
Rotational velocity (v sin i)	20 ± 7[1] km/s
Other designations
4 Canis Majoris, HR 2387, HD 46328, CD −23° 3991, HIP 31125, SAO 171895, GC 8496, ADS 5176, CCDM 06319-2325

Xi¹ Canis Majoris (ξ¹ CMa, ξ¹ Canis Majoris) is a star in the constellation Canis Major. It is approximately 2051 light years from Earth.

ξ¹ Canis Majoris is a blue-white B-type subgiant with a mean apparent magnitude of +4.34. It is classified as a Beta Cephei type variable star^[1] and its brightness varies from magnitude +4.33 to +4.36 with a period of 5.03 hours.

References

1. Hubrig, S.; et al. (January 2009), "New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars", Astronomische Nachrichten, 330 (4): 317, arXiv:0902.1314, Bibcode:2009AN....330..317H, doi:10.1002/asna.200811187