PSR B1257+12 d
Planet· orbits the Sun
PSR B1257+12 d ('Phobetor') — a super-Earth (~3.9 M⊕) on a 98-day orbit, the outermost of the three, and the other of the first two exoplanets ever confirmed. Mass is a timing minimum; no density is quoted.
Open in 3D viewSee PSR B1257+12 d in the live, interactive 3D map
Key facts
Minimum mass
2.33 × 10²⁵ kg
3.9 M⊕
Year
98.21 Earth days
Distance from PSR B1257+12
0.46 AU
Science
Physical
- Minimum mass (m·sin i)
- 2.33 × 10²⁵ kg · 3.9 M⊕
- Radius
- Not measured
Orbital
- Semi-major axis
- 0.46 AU
- Eccentricity
- 0.0264
- Inclination
- 0.00 °
- Orbital period
- 98.2 days
- Perihelion
- 0.448 AU
- Aphelion
- 0.472 AU
- Mean orbital velocity
- 51 km/s
Composition
- Bulk composition
- A super-Earth of ~3.9 Earth masses on a 98-day orbit, the outermost of the three — and, with c, among the first exoplanets ever confirmed. Irradiated by the pulsar; unimaged.
- Surface appearance
- Appearance based on NASA/JPL-Caltech's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The surface shown is an artistic representation, shown only in Vision mode; Realism shows a plain spectral colour.
Discovery & history
- Method
- Pulsar-timing detection
- Name
- Designated 'd' under the IAU planet-lettering convention; no IAU proper name has been assigned. (Historically also labelled A, B, C.)
One of the two planets announced in 1992 — among the first exoplanets ever confirmed.
Images
Never imaged — this world is known only from the split-second shifts it causes in its pulsar's radio beat. An artist's concept of the whole system is on the system view; no image of the planet itself exists.