PSR B1257+12 C
| Exoplanet | List of exoplanets | |
|---|---|---|
| 300px (Based on selected hypothetical modeled compositions) |
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| 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 | ||
| Semi-major axis | (a) | 0.46[1] AU |
| Eccentricity | (e) | 0.0252 ± 0.0002[1] |
| Orbital period | (P) | 98.2114 ± 0.0002[1] d |
| Inclination | (i) | 47 ± 3[1][note 1]° |
| Argument of periastron |
(ω) | 108.3 ± 0.5[1]° |
| Time of periastron | (T0) | 2,449,766.5 ± 0.1[1] JD |
| Physical characteristics | ||
| Mass | (m) | 3.9 ± 0.2[1] M⊕ |
| 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 d (ex PSR B1257+12 C) or Phobetor is an extrasolar planet approximately 980 light-years away in the constellation of Virgo (the Virgin). PSR B1257+12C was one of the first planets ever discovered outside the Solar system, and is currently the third object known to be orbiting the pulsar PSR B1257+12. The planet is nearly four times as massive as the Earth.
Contents
Name
The planets of PSR B1257+12 are designated from A to D (ordered by increasing distance). The reason that these planets are not named the same as the other extrasolar planets is mainly because of the time of their discovery. Being the first ever extrasolar planets discovered, and being discovered around a pulsar, the planets were given the uppercase letters "B" and "C" (like other planets). When a third planet was discovered around the system (in a closer orbit than the other two), the name "A" was commonly used. The name 51 Pegasi b (the first planet found around a Sun-like star) was the idea used for naming planets around regular stars.
The planet and its host star is one of the planetary systems selected by the International Astronomical Union as part of their public process for giving proper names to exoplanets and their host star (where no proper name already exists).[2][3] The process involved public nomination and voting for the new names.[4] In December 2015, the IAU announced the winning names were Phobetor for the planet and Lich for the pulsar.[5]
Notes
- ↑ The method used to determine the inclination includes a degeneracy because of the impossibility of determining whether the orbital motion is clockwise or anticlockwise. The alternate value of the inclination is 133 ± 3°.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ↑ NameExoWorlds.
- ↑ NameExoWorlds.
- ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- Lua error in package.lua at line 80: module 'strict' not found.
External links
Media related to Lua error in package.lua at line 80: module 'strict' not found. at Wikimedia Commons
| Preceded by
none
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Least massive exoplanet 1992 — 1994 |
Succeeded by PSR B1257+12 A |
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| Planets |
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Coordinates: 
13h 00m 01s, +12° 40′ 57″
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