Beta Hydri
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation | Hydrus |
| Right ascension | 00h 25m 45.1s |
| Declination | -77° 15′ 15″ |
| Apparent magnitude (V) | 2.80 |
| Spectral 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 |
| Physical Characteristics | |
| 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.
At around 150 B.C., this star was two degrees away from the southern celestial pole. It is currently the nearest relatively bright star to the southern pole.
None of its planets have yet been detected and it Gas Giants are likely to be in its outer solar system like ours.[citation needed]
[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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