Alpha Gruis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Grus |
| Right ascension | 22h 08m 14.0s |
| Declination | -46° 57′ 39.5″ |
| Apparent magnitude (V) | +1.73 |
| Characteristics | |
| Spectral type | B7 IV |
| U-B color index | -0.46 |
| B-V color index | -0.13 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | +10.9 km/s |
| Proper motion (μ) | RA: 127.6 mas/yr Dec.: -147.9 mas/yr |
| Parallax (π) | 32.16 ± 0.82 mas |
| Distance | 101 ± 3 ly (31.1 ± 0.8 pc) |
| Absolute magnitude (MV) | -0.74 |
| Details | |
| Mass | ? M☉ |
| Radius | 3.6 R☉ |
| Luminosity | 380 L☉ |
| Temperature | 13,500 K |
| Metallicity | ? |
| Rotation | ~236 km/s. |
| Age | ? years |
| Other designations | |
Alpha Gruis (α Gru / α Gruis) is the brighest star in the constellation Grus. It also has the traditional name Alnair (sometimes Al Na'ir or Al Nair, from the Arabic al-nayyir meaning "the bright (one)"). Confusingly, Alnair is also given as the proper name for Zeta Centauri by a navigator in middle of 20th century.[1]
[edit] References
- ^ P. Kunitzsch, T. Smart, 2006, A Dictionary of Modern Star Names: A Short Guide to 254 Star Names and Their Derivations, Sky Pub. Corp.
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