PSR B1259−63/LS 2883

LS 2883
Observation data; Epoch J2000 Equinox J2000
Constellation	Centaurus
Right ascension	13h 02m 47.655s
Declination	−63° 50′ 08.67″
Apparent magnitude (V)	10.34
Characteristics
Spectral type	O9.5Ve + pulsar
Astrometry
Proper motion (μ)	RA: −6.0 mas/yr ; Dec.: −5.7 mas/yr
Distance	7,500 ly
Orbit
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 B1259−63 PSR J1302−6350, THA 17-8, TYC 8997-1597-1, UCAC2 3710789, WRAY 15-1053.
Database references
SIMBAD	data

PSR J1302−6350 is a pulsar and member of an eclipsing binary star system with the blue O9.5Ve-class star LS 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. 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.

The star LS 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.

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