Gamma Indi
From Wikipedia, the free encyclopedia
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus[1] |
| Right ascension | 21h 26m 15.43919s[2] |
| Declination | −54° 39′ 37.6516″[2] |
| Apparent magnitude (V) | 6.09±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | F1III[5] |
| Astrometry | |
| Radial velocity (Rv) | +10.4±0.6[6] km/s |
| Proper motion (μ) | RA: +1.040 mas/yr[2] Dec.: +39.036 mas/yr[2] |
| Parallax (π) | 15.1909±0.0250 mas[2] |
| Distance | 214.7 ± 0.4 ly (65.8 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.98[1] |
| Details | |
| Mass | 1.72[7] M☉ |
| Radius | 2.47[8] R☉ |
| Luminosity | 12.5[8] L☉ |
| Surface gravity (log g) | 3.85[2] cgs |
| Temperature | 6,912[8] K |
| Metallicity [Fe/H] | −0.09[7] dex |
| Age | 1.40[7] Gyr |
| Other designations | |
| CPD−55°9586, HD 203760, HIP 105841, HR 8188, TYC 8810-1289-1[9] | |
| Database references | |
| SIMBAD | data |
Gamma Indi is a star in the constellation Indus. Its apparent magnitude is 6.09, much fainter than Delta Indi and unusually faint for a Gamma-labelled star, making it only visible from very dark skies in ideal conditions. Parallax measurements imply a distance of 65.8 parsecs (215 ly). The star is moving away with an heliocentric velocity of +10.4 km/s.
The spectrum of this star matches a spectral class of F1III,[5] with the luminosity class III suggesting it is a giant star that has exhausted the hydrogen at its core. However, stellar evolution models imply that it is not a giant star, but is still on the main sequence.[2] Around 1.72 times the mass of the Sun and 1.40 billion years old,[7] Gamma Indi is nearly 13 times as luminous as the Sun, with a radius 2.47 times larger. All this energy is released from its photosphere shining at an effective temperature of 6,912 K,[8] giving it the yellow-white hue typical of F-type stars.[10]
