HD 77338
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 09h 01m 12.4938s[1] |
| Declination | −25° 31′ 37.4333″[1] |
| Apparent magnitude (V) | 8.59 |
| Characteristics | |
| Evolutionary stage | subgiant star |
| Spectral type | K0IV |
| Astrometry | |
| Radial velocity (Rv) | 8.209[2] km/s |
| Proper motion (μ) | RA: 40.095[2] mas/yr Dec.: -271.640[2] mas/yr |
| Parallax (π) | 21.8739 ± 0.0192[2] mas |
| Distance | 149.1 ± 0.1 ly (45.72 ± 0.04 pc) |
| Details[3] | |
| Mass | 0.942 M☉ |
| Luminosity | 0.708 L☉ |
| Surface gravity (log g) | 4.42 cgs |
| Temperature | 5315 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotation | 33.4±10.0 d[4] |
| Rotational velocity (v sin i) | 1.3 km/s |
| Age | 9.5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 77338 is a K-type subgiant star which has recently exhausted its hydrogen fuel and has started to expand. Its surface temperature is 5315 K.[3] HD 77338 is enriched in its concentration of heavy elements compared to the Sun, with a metallicity Fe/H index of 0.16 but is much older at an age of 9.5 billion years.[3]
HD 77338 is unusually enriched in heavy elements for a star of its age. The anomalously high abundance of ions of manganese may indicate the star has recently passed through the common shell stage (engulfed a planet).[5]
Planetary system[]
In 2012, one planet, named , was discovered by the radial velocity method on a tight orbit with uncertain eccentricity.[6] Its equilibrium temperature is 954.8 K.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| ≥15.9+4.7 −5.3 M |