Beta Hydri
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Hydrus |
| Right ascension | 00h 25m 45.1s |
| Declination | -77° 15′ 15″ |
| Apparent magnitude (V) | 2.80 |
| Characteristics | |
| Spectral type | G2 IV |
| U-B color index | 0.11 |
| B-V color index | 0.61 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | 22.9 km/s |
| Proper motion (μ) | RA: 2,220.12 mas/yr Dec.: 324.37 mas/yr |
| Parallax (π) | 133.86 ± 0.51 mas |
| Distance | 24.37 ± 0.09 ly (7.47 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.43 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 1.9 R☉ |
| Luminosity | 3.53 L☉ |
| Temperature | 5,750 K |
| Metallicity | 49-100% |
| Rotation | 3.3 km/s. (~29 days) |
| Age | 6.7 × 109 years |
| Other designations | |
Beta Hydri (β Hyi / β Hydri) is a star in the constellation Hydrus (Note that Hydrus is not the same as Hydra).
It is about 24.4 light years away from Earth. Beta Hydri is often studied because it might give insights on what might happen to our Sun in the next 2.5 billion years. It is larger and slightly more massive than the Sun.
At around 150 BC, this star was two degrees away from the southern celestial pole. It is currently the nearest relatively bright star to the southern pole.
Likely to harbor a system of extrasolar planets. No planets have yet been detected around Beta Hydri.
[edit] See also
[edit] External links
- Beta Hydri. SolStation. Retrieved on November 3, 2005.
- Beta Hydri. Dr. Jim Kaler. Retrieved on March 15, 2005.
- Stellar Activity - Beta Hydri
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