Mu Hydrae
μ Hydrae, Latinised as Mu Hydrae, is a solitary, orange-hued star in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 3.83. Positioned just 1.8° to the south-southwest is the planetary nebula NGC 3242. Mu Hydrae has an annual parallax shift of 13.93 mas, which yields a distance estimate of 234 light years.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 10h 26m 05.42630s |
| Declination | −14° 19′ 56.2675″ |
| Apparent magnitude (V) | 3.83 |
| Characteristics | |
| Spectral type | K4 III |
| U−B color index | +1.83 |
| B−V color index | +1.47 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | +40.81±0.36 km/s |
| Proper motion (μ) | RA: −129.17 mas/yr Dec.: −79.76 mas/yr |
| Parallax (π) | 13.93 ± 0.18 mas |
| Distance | 234 ± 3 ly (71.8 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.45 |
| Details | |
| Radius | 45 R☉ |
| Luminosity | 332 L☉ |
| Surface gravity (log g) | 1.5 cgs |
| Temperature | 3,999±8 K |
| Metallicity [Fe/H] | −0.12 dex |
| Rotational velocity (v sin i) | 6.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K4 III, having used up its core hydrogen and has expanded to around 45 times the radius of the Sun. It is a suspected variable star, with a brightness that varies about 0.03 in magnitude. The relatively cool outer atmosphere has an effective temperature of 3999 K.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.