HIP 11915
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 33m 49.025s[1] |
| Declination | –19° 36′ 42.5032″[1] |
| Apparent magnitude (V) | 8.58[2] |
| Characteristics | |
| Spectral type | G5V[2] |
| Astrometry | |
| Radial velocity (Rv) | +14.1[1] km/s |
| Parallax (π) | 17.45 ± 1.07[1] mas |
| Distance | 190 ± 10 ly (57 ± 4 pc) |
| Details | |
| Mass | 1.0[2] M☉ |
| Temperature | 5760[2] K |
| Age | 4.0 (± 0.6)[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HIP 11915 is a G-type main-sequence star located 186 light-years from Earth in the constellation Cetus.[2] The star is a solar analog.
This star is entry number 11915 in the Hipparcos Catalogue. The star is located at 02:33:49.02495 right ascension, −19° 36' 42.5032" dec,[1][3] Too faint to be seen with the unaided eye, the star can be spotted with good binoculars.[3]
Planetary system
The system contains a gas giant, HIP 11915 b, with a mass and orbit very similar to that of Jupiter, located at approximately the same distance from its star. The discovery of HIP 11915 b is significant, because it is the first, and to date only, distant planetary system found that may be somewhat like the Solar System.[4][5] The radial velocity data also indicates that there is no large gas giant in this system with an orbital period of less than 1000 days. This means that there could be one or more terrestrial planets in the inner parts of the system, and the possibility of a habitable Earth-like planet.
This new discovery was made at the La Silla Observatory in Chile, using the High Accuracy Radial Velocity Planet Searcher instrument mounted on the European Southern Observatory’s 3.6-meter telescope.[6][7]
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".[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.99 ± 0.06 MJ | 4.8 ± .01 | 3830.0 ± 150 | 0.1 ± 0.07 | — | — |
References
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