PSR B1957 + 20

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Pulsar
PSR B1957 + 20
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation arrow
Right ascension 19 h 59 m 36.75 s
declination + 20 ° 48 ′ 14.6 ″
Astrometry
distance  (5,000)  ly
(1,530)  pc
Proper movement : 
in right ascension (−16)  mas / a
in declination (26)  mas / a
Physical Properties
Rotation period (1.6) ms
Age (2.2) bill.  A
Dimensions (1,4)  M ☉
Other names
and catalog entries
Catalog of pulsars
PSR J1959 + 2048
PSR B1957 + 20
Other names
Black Widow, QX Sagitae
Swell:
  1. ^ Catalog of Pulsars
  2. ^ Catalog of Pulsars
Aladin previewer

PSR J1957 + 20 (also Black Widow or Black Widow ) is a millisecond pulsar with a brown dwarf as a companion at a distance of about 5000 light years . The system forms the prototype of the so-called black widows .

The brown dwarf PSR J1957 + 20 b has a mass of about 0.022 M ☉ , a radius of about 10,000 kilometers and a surface temperature of 2900-8300 K .

Web links

Individual evidence

  1. ↑ a b Simbad
  2. ↑ a b c Exoplanet.eu
  3. ↑ a b MAGIC Collaboration: Observation of the black widow B1957 + 20 millisecond pulsar binary system with the MAGIC telescope . In: MNRAS . 470, No. 4, 2017, pp. 4608-4617. arxiv : 1706.01378 . bibcode : 2017MNRAS.470.4608A . doi : 10.1093 / mnras / stx1405 .