PSR B1257+12 b
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Extrasolar planet | List of extrasolar planets | |
---|---|---|
Parent star | ||
Star | PSR B1257+12 | |
Constellation | Virgo | |
Right ascension | (α) | 13h 00m 01s |
Declination | (δ) | +12° 40′ 57″ |
Distance | 980 ly (300 pc) | |
Spectral type | Pulsar | |
Orbital elements | ||
Semimajor axis | (a) | 0.19 AU |
Eccentricity | (e) | 0.00 |
Orbital period | (P) | 25.262 ± 0.003 d |
Angular distance | (θ) | 0.633 mas |
Longitude of periastron |
(ω) | 0° |
Time of periastron | (T0) | 2,449,765.6 ± 0.2 JD |
Semi-amplitude | (K) | ? m/s |
Physical characteristics | ||
Mass | (m) | 7e-05 MJ (0.025 M⊕) |
Discovery information | ||
Discovery date | 23 September 1994 | |
Discoverer(s) | Aleksander Wolszczan | |
Detection method | Pulsar Timing | |
Discovery site | Poland | |
Discovery status | Published |
PSR B1257+12 b, previously called PSR B1257+12 A, is the innermost planet orbiting the pulsar at a distance of 0.19 AU with an orbital period of approximately 25 days. In 1997, it was claimed that this planet was in fact an artifact caused by solar wind, but this claim has since been disproved. It is about twice as massive as Earth's Moon.