Astronomy:PSR J1930–1852

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Short description: Binary pulsar–neutron star system
PSR J1930–1852
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sagittarius
Right ascension  19h 30m 29.716s[1]
Declination –18° 51′ 46.27″[1]
Spectral type Pulsar + Neutron star
Distance1500 pc
PSR J1930–1852 A
Mass≤1.32 M
Rotation185.52016047926(8) ms
Age163 Myr
PSR J0952–0607 B
Mass≥1.30 M
PrimaryPSR J1930–1852 A
CompanionPSR J1930–1852 B
Period (P)45.0600007(5) d
Semi-major axis (a)50900000 km (mean separation)[lower-alpha 1]
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

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]

See also


  1. Orbital separation distance (semi-major axis from primary) calculated with Kepler's Third Law: [math]\displaystyle{ a = \sqrt[3]{\frac{GMT^2}{4\pi^2}} }[/math] given total system mass [math]\displaystyle{ M }[/math] = 2.59 M and orbital period [math]\displaystyle{ T }[/math] = 45.0600007 d.[2](p3) 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](p3)


  1. 1.0 1.1 "PSR J1930-1852 -- Pulsar". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 Mar 2023. 
  2. 2.0 2.1 2.2 2.3 2.4 Swiggum, J. K.Expression error: Unrecognized word "etal". (June 2015). "PSR J1930-1852: a Pulsar in the Widest Known Orbit around Another Neutron Star". The Astrophysical Journal 805 (2): 7. doi:10.1088/0004-637X/805/2/156. 156. Bibcode2015ApJ...805..156S. 
  3. Blue, Charles (10 May 2015). "Schreyer Scholar credited with co-discovery of new pulsar: Never-before-seen star found during NSF-funded educational outreach program". Eberly College of Science (Penn State University). Retrieved 3 March 2023. 
  4. Yong, Shao; Xiang-Dong, Li (January 2016). "Formation of the Double Neutron Star System PSR J1930-1852". The Astrophysical Journal 816 (1): 3. doi:10.3847/0004-637X/816/1/45. 45. Bibcode2016ApJ...816...45S.