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.