Xi Hydrae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 33m 00.11505s |
| Declination | −31° 51′ 27.4435″ |
| Apparent magnitude (V) | 3.54 |
| Characteristics | |
| Spectral type | G7 III |
| Astrometry | |
| Radial velocity (Rv) | −4.90±0.30 km/s |
| Proper motion (μ) | RA: −209.62 mas/yr Dec.: −40.84 mas/yr |
| Parallax (π) | 25.16±0.16 mas |
| Distance | 129.6 ± 0.8 ly (39.7 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.54 |
| Details | |
| Mass | 2.94±0.15 M☉ |
| Radius | 10.28±0.11 R☉ |
| Luminosity | 61.0±1.5 L☉ |
| Surface gravity (log g) | 2.78±0.07 cgs |
| Temperature | 5,034±34 K |
| Metallicity [Fe/H] | +0.16±0.20 dex |
| Rotational velocity (v sin i) | 2.7 km/s |
| Age | 510 Myr |
| Other designations | |
| ξ Hya, 288 G. Hydrae, CD−31°9083, HD 100407, HIP 56343, HR 4450, SAO 202558 | |
| Database references | |
| SIMBAD | data |
Xi Hydrae, Latinised from ξ Hydrae, is a solitary star in the equatorial constellation of Hydra. With an apparent magnitude of 3.54 it is visible to the naked eye. Based on parallax measurements, the star is situated 130 light-years from Earth.
Flamsteed gave Xi Hydrae the designation 19 Crateris. He included a number of stars now within the IAU boundaries of Hydra as part of a Hydra & Crater constellation overlapping parts of both modern constellations.