HIP 11915 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HIP 11915 | |
| Constellation | Cetus | |
| Right ascension | (α) | 02h 33m 49.025s[1] |
| Declination | (δ) | –19° 36′ 42.5032″[1] |
| Apparent magnitude | (mV) | 8.58[2] |
| Distance | 190 ± 10 ly (57 ± 4 pc) |
|
| Spectral type | G5V[2] | |
| Mass | (m) | 1.00[2] M☉ |
| Temperature | (T) | 5760[2] K |
| Age | 4.0 ± 6[2] Gyr | |
| Orbital elements | ||
| Semi-major axis | (a) | 4.8 ± 0.1[2] AU (718 Gm) |
| Eccentricity | (e) | 0.1 ± 0.070[2] |
| Orbital period | (P) | 3830.0 ± 150[2] d (10.486[2] y) |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 0.93[2] MJ (295.58 M⊕) |
| Discovery information | ||
| Discovery date | 2015[3] | |
| Discoverer(s) | Meléndez et al. | |
| Discovery method | HARPS | |
| Discovery site | La Silla Observatory, Chile | |
| Discovery status | ||
HIP 11915 b is an exoplanet located in the HIP 11915 system. 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.[3] The planet orbits its star at a distance of approximately 4.8 Astronomical Units.[2]
While several Jovian-sized planets have been discovered, most have been found orbiting close to their stars. It is now hypothesized that Jupiter's movement in the Solar System may have cleared the way for the rocky inner planets, including Earth, to form. The similarity extends to the star that centers the system; like the Sun, HIP 11915 is a G-class star.
According to Jorge Meléndez, who led the University of São Paulo, Brazil team that discovered HIP 11915 b, "the quest for an Earth 2.0, and for a complete Solar System 2.0, is one of the most exciting endeavors in astronomy".[3]
