| 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 | |
| Mass | (m) | assumed 1.4 M☉ |
| Radius | (r) | ~0.00002 R☉ |
| Age | 0.8 Gyr | |
| Orbital elements | ||
| Semimajor axis | (a) | ~2.6 AU |
| Orbital period | (P) | ~3.5 y |
| Physical characteristics | ||
| Mass | (m) | 0.0004 M⊕ |
| Discovery information | ||
| Discovery date | 2002 | |
| Discoverer(s) | Aleksander Wolszczan | |
| Detection method | Pulsar Timing | |
| Discovery site | Poland | |
| Discovery status | Published | |
PSR B1257+12 D is a possible extrasolar dwarf planet approximately 980 light-years away in the constellation of Virgo. It is suspected that a dwarf planet is orbiting PSR B1257+12 at an average orbital distance of 2.6 AU with an orbital period of approximately 3.5 years.
Originally, in 1996, a possible Saturn-like (100 Earth mass) gas giant was announced orbiting the pulsar at a distance of about 40 AU. However, the discovery was not conclusive and was later retracted. It is now thought that the signal came from a dwarf planetary body
The object is thought to be very small, less than 20% of the mass of Pluto[1]
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