Tau2 Hydrae
Tau2 Hydrae is a probable astrometric binary star system in the equatorial constellation of Hydra. Based upon an annual parallax shift of 6.30 mas as seen from Earth, it is located around 520 light years from the Sun. The brighter component is visible to the naked eye with an apparent visual magnitude of +4.56.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 31m 58.92729s |
| Declination | −01° 11′ 04.7899″ |
| Apparent magnitude (V) | +4.56 |
| Characteristics | |
| Spectral type | A3 V |
| U−B color index | +0.06 |
| B−V color index | +0.11 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | +3.9±0.4 km/s |
| Proper motion (μ) | RA: −12.60 mas/yr Dec.: −3.99 mas/yr |
| Parallax (π) | 6.30 ± 0.72 mas |
| Distance | approx. 520 ly (approx. 160 pc) |
| Absolute magnitude (MV) | −1.43 |
| Details | |
| Radius | 4.5 R☉ |
| Luminosity | 285 L☉ |
| Temperature | 7,918 K |
| Rotational velocity (v sin i) | 54.0±0.6 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary member, component A, is an A-type main sequence star with a stellar classification of A3 V. It is a suspected variable of unknown type, with an amplitude of 0.06 in visual magnitude. The star has around 4.5 times the radius of the Sun and is radiating about 285 times the solar luminosity from its photosphere at an effective temperature of 7,918 K.
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