Alpha Indi
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus |
| Right ascension | 20h 37m 34.032s |
| Declination | −47° 17′ 29.41″ |
| Apparent magnitude (V) | 3.11 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K0 III–IV |
| U−B color index | +0.79 |
| B−V color index | +1.00 |
| Astrometry | |
| Radial velocity (Rv) | −1.3 km/s |
| Proper motion (μ) | RA: +50.922 mas/yr Dec.: +66.026 mas/yr |
| Parallax (π) | 32.8989±0.2225 mas |
| Distance | 99.1 ± 0.7 ly (30.4 ± 0.2 pc) |
| Absolute magnitude (MV) | 0.78±0.03 |
| Details | |
| Mass | 2.15±0.13 M☉ |
| Radius | 9.89±0.21 R☉ |
| Luminosity | 50.9±1.6 L☉ |
| Surface gravity (log g) | 2.73±0.094 cgs |
| Temperature | 4,904±37 K |
| Metallicity [Fe/H] | −0.038±0.029 dex |
| Age | 1.572±0.273 Gyr |
| Other designations | |
| HD 196171, HR 7869, SAO 230300, FK5 769, CD−47°13477, HIP 101772 | |
| Database references | |
| SIMBAD | data |
Alpha Indi (α Ind, α Indi) is the brightest star in the southern constellation Indus. Parallax measurements imply that it is located about 100 light years from Earth. It has an apparent visual magnitude of 3.22, being readily visible to the naked eye, and has an absolute magnitude of +0.78.