Zeta Indi

Zeta Indi is a single[7] star in the southern constellation Indus, near the northern constellation border with Microscopium. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90.[2] The star is located approximately 430 light years away from the Sun based on parallax.[1] The radial velocity estimate for this object is poorly constrained, but it appears to be moving closer at the rate of around −5 km/s.[2]

Zeta Indi
Location of ζ Indi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Indus
Right ascension  20h 49m 28.96165s[1]
Declination −46° 13′ 36.6083″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Evolutionary stage giant
Spectral type K5III[3]
B−V color index +1.494±0.059[2]
Astrometry
Radial velocity (Rv)−5.20±2.8[4][2] km/s
Proper motion (μ) RA: +40.050[1] mas/yr
Dec.: +28.199[1] mas/yr
Parallax (π)7.5666 ± 0.2153[1] mas
Distance430 ± 10 ly
(132 ± 4 pc)
Absolute magnitude (MV)−0.61[2]
Details
Radius44.79+0.86
−5.47[1] R☉
Luminosity446±14[1] L☉
Surface gravity (log g)1.93[5] cgs
Temperature3,963+267
−37[1] K
Other designations
ζ Ind, CD−46°13718, FK5 3661, GC 29008, HD 198048, HIP 102790, HR 7952, SAO 230391[6]
Database references
SIMBADdata

This object is an aging giant star with a stellar classification of K5III.[3] With the supply of hydrogen at its core exhausted, the star has expanded off the main sequence and now has 45[1] times the girth of the Sun. It is radiating 446[1] times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,963 K.[1]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (May 2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331–346, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. Vizier catalog entry
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
  4. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W, LCCN 54001336
  5. Bordé, P.; et al. (October 2002), "A catalogue of calibrator stars for long baseline stellar interferometry", Astronomy and Astrophysics, 393: 183–193, Bibcode:2002A&A...393..183B, doi:10.1051/0004-6361:20021020.
  6. "zet Ind". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-20.
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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