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Alpha Indi
Star in the constellation Indus / From Wikipedia, the free encyclopedia
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.[1] It is visible to the naked eye at an apparent visual magnitude of 3.22.[2] Considering its distance and apparent magnitude, its absolute magnitude is equal to 0.65.[4]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus |
Right ascension | 20h 37m 34.032s[1] |
Declination | –47° 17′ 29.4052″[1] |
Apparent magnitude (V) | 3.11[2] |
Astrometry | |
Radial velocity (Rv) | −1.3[3] km/s |
Proper motion (μ) | RA: +50.922 mas/yr[1] Dec.: +66.026 mas/yr[1] |
Parallax (π) | 32.8989 ± 0.2225 mas[1] |
Distance | 99.1 ± 0.7 ly (30.4 ± 0.2 pc)[1] |
Absolute magnitude (MV) | 0.65[4] |
Characteristics | |
Evolutionary stage | between subgiant and giant star |
Spectral type | K0 III–IV[5] |
U−B color index | +0.79[2] |
B−V color index | +1.00[2] |
Details[6] | |
Mass | 1.879±0.13 M☉ |
Radius | 9.706±0.294 R☉ |
Luminosity | 59[7] L☉ |
Surface gravity (log g) | 2.96±0.1 cgs |
Temperature | 4896±34 K |
Metallicity [Fe/H] | −0.05±0.03 dex |
Age | 1.572±0.273 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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