15 Canis Majoris

15 Canis Majoris

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Canis Major
Right ascension	06^h 53^m 32.907^s[1]
Declination	−20° 13′ 27.32″[1]
Apparent magnitude (V)	+4.82
Characteristics
Spectral type	B1 Ib[2]
Variable type	β Cep[2]
Astrometry
Proper motion (μ)	RA: -5.46 ± 0.16[1] mas/yr Dec.: 3.58 ± 0.17[1] mas/yr
Parallax (π)	2.68 ± 0.24[1] mas
Distance	1,200 ± 100 ly (370 ± 30 pc)
Details
Mass	12.8 ± 1.2[2] M☉
Radius	6.8 ± 1.2[2] R☉
Luminosity	20,000[2] L☉
Surface gravity (log g)	3.89 ± 0.20[2] cgs
Temperature	26,100 ± 1,200[2] K
Rotational velocity (v sin i)	20 ± 12[2] km/s
Other designations
EY Canis Majoris, HR 2571, HD 50707, BD−20°1616, FK5 2532, HIP 33092, SAO 172520, GC 9034.

15 Canis Majoris is a star in the constellation Canis Major.

15 Canis Majoris is a blue-white B-type subgiant with a mean apparent magnitude of +4.82. It is approximately 1200 light years from Earth.^[1] It is classified as a Beta Cephei type variable star and its brightness varies from magnitude +4.79 to +4.84 with a period of 4.43 hours.

References

1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
2. 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