PSR B1957 + 20
Pulsar PSR B1957 + 20 |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | arrow | ||||||
Right ascension | 19 h 59 m 36.75 s | ||||||
declination | + 20 ° 48 ′ 14.6 ″ | ||||||
Astrometry | |||||||
distance | (5,000) ly (1,530) pc |
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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 |
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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
- ↑ a b Simbad
- ↑ a b c Exoplanet.eu
- ↑ 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 .