V0391 Peg b
V0391 Peg b is a cold gas giant orbiting V0391 Peg in the constellation Pegasus. It lies about 3,901 light-years from Earth and was discovered in 2007 using the pulsation timing variations method.
Is V0391 Peg b in the Habitable Zone?
The position of V0391 Peg b relative to the habitable zone of V0391 Peg cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on V0391 Peg b — one full orbit around V0391 Peg — lasts 1,170.0 Earth days, longer than an Earth year. It orbits at an average distance of 1.700 AU.
How Was V0391 Peg b Discovered?
V0391 Peg b was discovered in 2007 using the pulsation timing variations method, with observations from Multiple Observatories.
Pulsation timing variations find planets around stars that pulsate with stable rhythms; an orbiting planet periodically delays or advances the arrival of these pulsations.
How Far Away Is V0391 Peg b?
V0391 Peg b is 3,900.8 light-years (1,196.0 parsecs) from Earth. Light arriving here tonight left the planet about 3,901 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 68,654,080 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. V0391 Peg b scores 0.17, ranking #4,106 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: V0391 Peg
V0391 Peg
- Surface temperature
- 29,300 K (Sun: 5,772 K)
- Mass
- 0.50 M☉
- Radius
- 0.23 R☉
- Age
- 10.0 billion years (Sun: 4.6)
Planetary System
V0391 Peg b is the only planet known to orbit V0391 Peg so far.
V0391 Peg b — Complete Data
| Mass (best estimate) | 1,017.06 Earth masses |
|---|---|
| Orbital period | 1,170.00 days |
| Orbital distance | 1.700 AU |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 3,900.8 light-years (1,196.0 parsecs) |
| Constellation | Pegasus |
| Discovery method | Pulsation Timing Variations |
| Discovery facility | Multiple Observatories |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2015-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About V0391 Peg b
Is V0391 Peg b habitable?
V0391 Peg b is not known to orbit within the habitable zone of V0391 Peg, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is V0391 Peg b?
V0391 Peg b is about 3,901 light-years from Earth in the constellation Pegasus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 68,654,080 years to get there.
How long is a year on V0391 Peg b?
One orbit around V0391 Peg takes 1,170.0 Earth days.
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