HD 1237
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydrus |
| Right ascension | 00h 16m 12.6791s |
| Declination | −79° 51′ 04.2447″ |
| Apparent magnitude (V) | 6.59 |
| Characteristics | |
| HD 1237 A | |
| Spectral type | G6 V |
| B−V color index | 0.749 |
| HD 1237 B | |
| Spectral type | M4 V |
| Astrometry | |
| Radial velocity (Rv) | −5.2±0.2 km/s |
| Proper motion (μ) | RA: 433.908±0.044 mas/yr Dec.: −56.322±0.039 mas/yr |
| Parallax (π) | 56.9319±0.0235 mas |
| Distance | 57.29 ± 0.02 ly (17.565 ± 0.007 pc) |
| Absolute magnitude (MV) | 5.37 ± 0.01 |
| Details | |
| HD 1237 A | |
| Mass | 1.00 ± 0.10 M☉ |
| Radius | 0.86 ± 0.07 R☉ |
| Luminosity | 0.64 L☉ |
| Surface gravity (log g) | 4.58 ± 0.09 cgs |
| Temperature | 5,572 ± 40 K |
| Metallicity [Fe/H] | 0.12 ± 0.04 dex |
| Rotation | 7.0±0.7 d |
| Rotational velocity (v sin i) | 5.3±1.0 km/s |
| Age | 800 Myr |
| HD 1237 B | |
| Mass | 0.13 M☉ |
| Other designations | |
| 2 G. Hydri, CD−80° 9, GJ 3021, HD 1237, HIP 1292, SAO 258219, 2MASS J00161266-7951042 | |
| Database references | |
| SIMBAD | data |
HD 1237 is a binary star system approximately 57 light-years away in the constellation of Hydrus (the Water Snake).
The visible star in the system, A, is considered to be a solar analog due close mass to the sun. HD 1237 differs from the sun in that HD 1237 is much younger, has high metallicity, has much cooler temperature and is in a binary system. As of 2000, it has been confirmed that an extrasolar planet orbits the star. It is of note for being a relatively Sun-like star not very far from the Sun that is home to an extrasolar planet.