PSR B1257+12 d
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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) | 0.46 AU |
Eccentricity | (e) | 0.0252 ± 0.0002 |
Orbital period | (P) | 98.2114 ± 0.0002 d |
Angular distance | (θ) | 1.533 mas |
Longitude of periastron |
(ω) | 108.3 ± 0.5° |
Time of periastron | (T0) | 2,449,766.5 ± 0.1 JD |
Semi-amplitude | (K) | ? m/s |
Physical characteristics | ||
Mass | (m) | 0.012 (± 0.0006) MJ (3.9 ± 0.2 M⊕) |
Discovery information | ||
Discovery date | 22 January 1992 | |
Discoverer(s) | Aleksander Wolszczan | |
Detection method | Pulsar Timing | |
Discovery site | Poland | |
Discovery status | Published |
PSR B1257+12 d, previously known as PSR B1257+12 C, is the third planet orbiting the pulsar at an average orbital distance of 0.46 AU with an orbital period of approximately 98 days. It is nearly four times as massive as the Earth.