BP Crucis

BP Crucis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crux
Right ascension 12h 26m 37.561s[1]
Declination −62° 46′ 13.16″[1]
Apparent magnitude (V) 10.83[2]
Characteristics
Spectral type B1 Ia+[3]
U−B color index +0.42[2]
B−V color index +1.76[2]
Variable type Ellipsoidal + X-ray[4]
Astrometry
Parallax (π)0.34 ± 0.75 mas[5]
Distance3,040[2] pc
Absolute magnitude (MV)−7.47[3]
Orbit
Period (P)41.498 days[2]
Semi-major axis (a)0.00029"
(191.7 R☉[6])
Eccentricity (e)0.462[2]
Inclination (i)60[6]°
Details
Mass43[3] M☉
Radius70[3] R☉
Luminosity (bolometric)470,000[3] L☉
Surface gravity (log g)2.38[3] cgs
Temperature18,100[3] K
Rotational velocity (v sin i)55[3] km/s
Other designations
BP Cru, Hen 3-788, Wray 15-977, 2MASS J12263756-6246132, GX 301-2, AAVSO 1221-62
Database references
SIMBADdata

BP Crucis (x-ray source GX 301-2) is an X-ray binary system containing a blue hypergiant and a pulsar.

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  2. ^ a b c d e f Cite error: The named reference kaper was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference clark was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference dr1 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference gravity was invoked but never defined (see the help page).