PSR B1919+21
Pulsar in the constellation Vulpecula / From Wikipedia, the free encyclopedia
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PSR B1919+21 is a pulsar with a period of 1.3373 seconds[4] and a pulse width of 0.04 seconds. Discovered by Jocelyn Bell Burnell on 28 November 1967, it is the first discovered radio pulsar.[5] The power and regularity of the signals were briefly thought to resemble an extraterrestrial beacon, leading the source to be nicknamed LGM, later LGM-1 (for "little green men").[6]
Quick Facts Constellation, Right ascension ...
Chart on which Jocelyn Bell Burnell first recognised evidence of PSR B1919+21, exhibited at Cambridge University Library | |
Observation data Epoch J2000 (ICRS) Equinox J2000 (ICRS) | |
---|---|
Constellation | Vulpecula |
Right ascension | 19h 21m 44.815s[1] |
Declination | +21° 53′ 02.25″[1] |
Characteristics | |
Evolutionary stage | Pulsar |
Astrometry | |
Distance | 1000+2600 −700 ly (300+800 −200[2] pc) |
Details | |
Mass | ~1.4 M☉ |
Radius | ~1.4 × 10−5 R☉ |
Luminosity | 0.006[3] L☉ |
Rotation | 1.3373 s[4] |
Age | 16[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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The original designation of this pulsar was CP 1919, which stands for Cambridge Pulsar at RA 19h 19m .[7] It is also known as PSR J1921+2153 and is located in the constellation of Vulpecula.