HIP 11915 b
HIP 11915 b is an exoplanet orbiting the solar twin star HIP 11915 about 190 light-years (57 parsecs, or nearly 1.798×1015 km) from Earth in the constellation Cetus. It is notable as the first exoplanet to be discovered with an orbit and mass similar to that of Jupiter (essentially, a "Jupiter analog"), suggesting that its system may be similar to that of the Solar System. It orbits its star at a distance of approximately 4.8 AU. The exoplanet was found by using the radial velocity method, where periodic Doppler shifts of spectral lines of the host star suggest an orbiting object.
An artist's impression of the exoplanet HIP 11915 b. | |
| Discovery | |
|---|---|
| Discovered by | Meléndez et al. |
| Discovery site | La Silla Observatory, Chile |
| Discovery date | July 2015 |
Detection method | HARPS |
| Orbital characteristics | |
Semi-major axis | 4.8 ± 0.1 AU |
| Eccentricity | 0.1 ± 0.070 |
Orbital period (sidereal) | 3830.0 ± 150 d 10.486 y |
| Star | HIP 11915 |
| Physical characteristics | |
Mean radius | ~1 RJ |
| Mass | 0.99 ± 0.06 MJ (314.82 ME) |
| Temperature | 118 K (−155 °C; −247 °F) |
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