HIP 11915 b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | HIP 11915 | |
| Constellation | Cetus | |
| Right ascension | (α) | 02h 33m 49.025s |
| Declination | (δ) | –19° 36′ 42.5032″ |
| Apparent magnitude | (mV) | 8.58 |
| Distance | 190 (± 10) ly (57 ± 4 pc) |
|
| Spectral type | G5V | |
| Mass | (m) | 1.00 M☉ |
| Radius | (r) | 1.01 R☉ |
| Temperature | (T) | 5760 (± 4) K |
| Metallicity | [Fe/H] | −0.059 (± 0.004) |
| Age | 4.16 (± 0.65) Gyr | |
| Physical characteristics | ||
| Mass | (m) | 0.99 (± 0.06)MJ (314.82 M⊕) |
| Radius | (r) | ~1RJ |
| Temperature | (T) | 118 K (−155 °C; −247 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 4.8 (± 0.1)AU (718 Gm) |
| Eccentricity | (e) | 0.1 (± 0.070) |
| Orbital period | (P) | 3830.0 (± 150)d (10.486y) |
| Discovery information | ||
| Discovery date | July 2015 | |
| Discoverer(s) | Meléndez et al. | |
| Discovery method | HARPS | |
| Discovery site | La Silla Observatory, Chile | |
| Discovery status | confirmed | |
| Other designations | ||
|
HD 16008 b, SAO 148648 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.
HIP 11915 b is a jovian planet, an exoplanet with a mass and radius close to that of the planet Jupiter. It has a mass of 0.99 MJ (315 M⊕) and a likely radius of around 1 RJ. Based on models, it is expected to have a temperature of around 118 K (−155 °C; −247 °F). This is nearly the same as the planet Jupiter.
The host star, HIP 11915, is a G-type star that is the same mass of the Sun (a solar twin). It has a temperature of 5760 K, nearly the same as the Sun, which has a temperature of 5778 K. The star's age is estimated to be about 4.16 billion years old, about 540 million years younger than the Sun, which is 4.6 billion years old. The radius of the star has not been directly known, but given the same mass as the Sun, HIP 11915 likely has a radius of around 1.01 R☉, making it the same size as the Sun.
...
Wikipedia