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PSR J1930–1852
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Sagittarius
Right ascension	19h 30m 29.716s
Declination	–18° 51′ 46.27″
Characteristics
Spectral type	Pulsar + Neutron star
Astrometry
Distance	1500 pc
Details
PSR J1930–1852 A
Mass	≤1.32 M☉
Rotation	185.52016047926(8) ms
Age	163 Myr
PSR J0952–0607 B
Mass	≥1.30 M☉
Orbit
Primary	PSR J1930–1852 A
Companion	PSR J1930–1852 B
Period (P)	45.0600007(5) d
Semi-major axis (a)	50900000 km (mean separation)
Eccentricity (e)	0.39886340(17)
Periastron epoch (T)	JD 2456527.142330(3); 22 August 2013 15:24:57 UTC
Other designations
	PSR J1930–1852
Database references
SIMBAD	data

PSR J1930–1852 is a binary pulsar system, composed of a pulsar and a neutron star and orbiting around their common center of mass. Located 4,900 light-years (1,500 pc) away from Earth in the constellation Sagittarius, it is the most distantly-separated double neutron star system known.^[2]^[3]^[4]

Notes

^ Orbital separation distance (semi-major axis from primary) calculated with Kepler's Third Law: $a={\sqrt[{3}]{\frac {GMT^{2}}{4\pi ^{2}}}}$ given total system mass $M$ = 2.59 M_☉ and orbital period $T$ = 45.0600007 d.^[2]^: 3 Swiggum et al. (2015) determined a minimum projected semi-major axis of 86.890277(7) light seconds (26049049(2) km) from radio pulsation timing.^[2]^: 3