PSR B1259-63/LS 2883

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LS 2883
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 13h 02m 47.655s[1]
Declination –63° 50′ 08.67″[1]
Apparent magnitude (V) 10.34
Characteristics
Spectral type O9.5Ve[2] + pulsar
Astrometry
Proper motion (μ) RA: −6.0[1] mas/yr
Dec.: −5.7[1] mas/yr
Distance 7,500[3] ly
Orbit[4]
Companion SS 2883
Period (P) 1237 days
Eccentricity (e) 0.87
Inclination (i) 36°
Other designations
AAVSO 1256-63, ALS 2883, AX J1302-638, CPD-63° 2495, GSC 08997-01597, Hbg 757, Hen 3-852, INTREF 538, LS 2883, MSX6C G304.1845-00.9916, PSR J1302-6350, THA 17-8, TYC 8997-1597-1, UCAC2 3710789, WRAY 15-1053.[5]
Database references
SIMBAD data

PSR B1259-63 is a pulsar and member of an eclipsing binary star system with the blue B2e-class star SS 2883. The pair has an eccentric orbit that is inclined to the line of sight from Earth by about 36°, leading to a 40-day long eclipse each time the pulsar passes behind the star.[4] The pulsar has a period of about 48 ms and a luminosity of 8.3 × 1035 erg/s. It emits very high energy gamma rays that vary on a time scale of several days.[6]

The star SS 2883 has about 10 solar masses and is 6 solar radii in size. The rate of rotation is about 280 km/s at the equator, or 70% of the breakup velocity.[4]

References

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External links


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