HIP 11915
HIP 11915 is a G-type main-sequence star located about 190 light-years from Earth in the constellation Cetus. It is best known for its characteristics, which are very similar to those of the Sun, including the mass, radius, temperature, metallicity and age, which means that it is almost a solar twin, being just 500 million years younger than the Sun and with a lower metallicity. It is also known for its planetary companion, HIP 11915 b, which has a mass and orbital distance very similar to that of Jupiter, but probably with a slightly higher orbital eccentricity.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 33m 49.026s |
| Declination | –19° 36′ 42.500″ |
| Apparent magnitude (V) | 8.58 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G5V |
| Astrometry | |
| Radial velocity (Rv) | +14.1 ± 0.5 km/s |
| Proper motion (μ) | RA: 225.590±0.082 mas/yr Dec.: 35.400±0.090 mas/yr |
| Parallax (π) | 18.63 ± 0.29 mas |
| Distance | 175 ± 3 ly (53.7 ± 0.8 pc) |
| Absolute magnitude (MV) | 4.83 |
| Details | |
| Mass | 0.991±0.003 M☉ |
| Radius | ~1.01 R☉ |
| Luminosity | 1.0+0.13 −0.12 L☉ |
| Surface gravity (log g) | 4.47±0.008 cgs |
| Temperature | 5773±2 K |
| Metallicity [Fe/H] | −0.057±0.003 dex |
| Rotational velocity (v sin i) | 0.99 ± 0.15 km/s |
| Age | 3.87±0.39 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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. Too faint to be seen with the unaided eye, the star can be spotted with good binoculars.