Psi Hydrae
Psi Hydrae (ψ Hydrae) is a star system in the equatorial constellation of Hydra. Based upon an annual parallax shift of 14.09 mas as seen from Earth, it is located around 231 light years away from the Sun. It is faintly visible to the naked eye with an apparent magnitude of 4.97.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 13h 09m 03.27026s |
| Declination | −23° 07′ 05.0501″ |
| Apparent magnitude (V) | 4.97 |
| Characteristics | |
| Spectral type | K0 III |
| U−B color index | +0.95 |
| B−V color index | +1.05 |
| Astrometry | |
| Radial velocity (Rv) | −17.2±0.6 km/s |
| Proper motion (μ) | RA: −20.08 mas/yr Dec.: −39.81 mas/yr |
| Parallax (π) | 14.09 ± 0.48 mas |
| Distance | 231 ± 8 ly (71 ± 2 pc) |
| Absolute magnitude (MV) | +0.54 |
| Details | |
| Radius | 10.6 R☉ |
| Luminosity | 56 L☉ |
| Surface gravity (log g) | 2.72 cgs |
| Temperature | 4,680 K |
| Metallicity [Fe/H] | −0.19±0.04 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.