PSR B1257+12 C
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | PSR B1257+12 | |
| Constellation | Virgo | |
| Right ascension | (α) | 13h 00m 01s |
| Declination | (δ) | +12° 40′ 57″ |
| Apparent magnitude | (mV) | 12.2 |
| Distance | 2315 ly (710 pc) |
|
| Spectral type | Pulsar | |
| Mass | (m) | 1.4 M☉ |
| Radius | (r) | ~0.000015 R☉ |
| Temperature | (T) | ≤28856 K |
| Age |
1+2.0 −0.0 Gyr |
|
| Physical characteristics | ||
| Mass | (m) | 3.9 (± 0.2)M⊕ |
| Radius | (r) | ~1.5 R⊕ |
| Stellar flux | (F⊙) | 24.58⊕ |
| Temperature | (T) | 567 K (294 °C; 561 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 0.46AU |
| Eccentricity | (e) | 0.0252 ± 0.0002 |
| Orbital period | (P) | 98.2114 ± 0.0002d |
| Inclination | (i) | 47 ± 3° |
| Argument of periastron |
(ω) | 108.3 ± 0.5° |
| Time of periastron | (T0) | 2,449,766.5 ± 0.1JD |
| Discovery information | ||
| Discovery date | 22 January 1992 | |
| Discoverer(s) | Aleksander Wolszczan | |
| Discovery method | Pulsar Timing | |
| Discovery site |
 Poland
|
|
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
PSR B1257+12 C, alternatively designated PSR B1257+12 d, also named Phobetor, is a super-Earth exoplanet orbiting the pulsar PSR B1257+12 approximately 2,315 light-years (710 parsecs, or nearly 2.1908×1016 km) away from Earth in the constellation of Virgo. It was one of the first planets ever discovered outside the Solar System. It was discovered using the pulsar timing method, where the regular pulses of a pulsar are measured to determine if there is a planet causing variations in the data.
In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Phobetor for this planet. The winning name was submitted by the Planetarium Südtirol Alto Adige in Karneid, Italy. Phobetor is the deity of nightmares in Greek mythology.
PSR B1257+12 C is a super-Earth, an exoplanet that has a radius and mass larger than that of Earth. It has an equilibrium temperature of 567 K (294 °C; 561 °F). It has a mass of 3.9 M⊕ and a likely radius of 1.5 R⊕, based on its mass.
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