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Exoplanet 51 Pegasi b
Exoplanet 51 Pegasi b orbits star 51 Pegasi that lies 51 light years away from the Sun.
It weighs about 150.052 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
51 light years
51 light years
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51 Pegasi b
Exoplanet
Star: 51 Pegasi
Distance from the star: 0.0527 AU
Orbit around star: 4.230785 days
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Orbital period
Orbital period of exoplanet 51 Pegasi b around its star is 4.230785 days.
The orbital period of an exoplanet is the time it takes to complete one full orbit around its star, usually measured in days. Most of the exoplanets discovered so far have orbital periods of less than one year...
More about Orbital period in StellarGuide
Basic characteristic
Mass: 150.052 M Earth
| 0.4722 M Jupiter
Exoplanet mass
Exoplanet 51 Pegasi b has 150.052 Earth masses (or 0.4722 Jupiter masses).
The mass of an exoplanet is one of the most important characteristics for understanding what kind of world it is — whether it’s small and rocky like Earth or large and gaseous like Jupiter. Mass provides key information about the planet’s composition, gravity, and formation history...
More about Exoplanet mass in StellarGuide
Temperature: 1284 K | 1010.85 °C
Year of discovery: 1995 (radial velocity)
Other designations of this exoplanet
Helvetios b, 51 Peg b, Gliese 882 b, GJ 882 b, HR 8729 b, BD +19°5036 b, HD 217014 b, LTT 16750 b, NLTT 55385 b, GCTP 5568.00 b, SAO 90896 b, HIC 113357 b, HIP 113357 b, GC 32003 b, 2MASS J22572795+2046077 b, TIC 139298196 b, TYC 1717-2193-1 b, WDS J22575+2046A b
Helvetios b, 51 Peg b, Gliese 882 b, GJ 882 b, HR 8729 b, BD +19°5036 b, HD 217014 b, LTT 16750 b, NLTT 55385 b, GCTP 5568.00 b, SAO 90896 b, HIC 113357 b, HIP 113357 b, GC 32003 b, 2MASS J22572795+2046077 b, TIC 139298196 b, TYC 1717-2193-1 b, WDS J22575+2046A b
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51 Pegasi system structure
Exoplanet 51 Pegasi b orbits star 51 Pegasi, which has bigger mass than Sun. It is the only known exoplanet orbiting this star
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51 Pegasi | ||||||||
| 51 Pegasi b | 0.05 AU | 150.1 M⊕ | 4.2 days | ||||||
Comparison
When comparing to the Solar system planets, 51 Pegasi b has 47 % of mass of Jupiter and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 2728.22 | 184.11 | 150.05 | 1364.11 | 0.47 | 1.58 | 10.28 | 8.72 |
|
Distance | 0.14 | 0.07 | 0.05 | 0.03 | 0.01 | 0.01 | 0 | 0 |
|
Temperature | 2.92 | 1.74 | 4.46 | 6.17 | 7.88 | 9.65 | 16.46 | 17.83 |
Habitability
Habitable zone of the star: 2.6 - 3.8 AU
The planet orbits too close to its star and is exposed to extreme temperatures and radiation prohibiting life as we know it.