Alpha Indi

α Indi
Location of α Indi (circled)
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]
Distance99.1 ± 0.7 ly
(30.4 ± 0.2 pc)[1]
Absolute magnitude (MV)0.78±0.03[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[4]
Mass2.15±0.13 M☉
Radius9.89±0.21 R☉
Luminosity50.9±1.6 L☉
Surface gravity (log g)2.73±0.094 cgs
Temperature4904±37 K
Metallicity [Fe/H]−0.038±0.029 dex
Age1.572±0.273[6] Gyr
Other designations
HD 196171, HR 7869, SAO 230300, FK5 769, CD −47 13477, HIP 101772.[7]
Database references
SIMBADdata

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 has an apparent visual magnitude of 3.22,[2] being readily visible to the naked eye, and has an absolute magnitude of +0.78.[4]

  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference rgcrv66 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference ottoni was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gomes2021 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).