Eta3 Fornacis

η3 Fornacis
Location of η3 Fornacis (top star inside circle)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Fornax
Right ascension 02h 50m 40.407s[1]
Declination −35° 40′ 33.06″[1]
Apparent magnitude (V) 5.47[2]
Characteristics
Evolutionary stage giant
Spectral type K2III[3]
U−B color index +1.31[2]
B−V color index +1.25[2]
Astrometry
Radial velocity (Rv)13.10±0.12[1] km/s
Proper motion (μ) RA: +4.093[1] mas/yr
Dec.: −54.551[1] mas/yr
Parallax (π)6.6631 ± 0.0580 mas[1]
Distance489 ± 4 ly
(150 ± 1 pc)
Absolute magnitude (MV)−0.26[4]
Details
Mass3.7[1] M☉
Radius21.9[1] R☉
Luminosity249[1] L☉
Surface gravity (log g)2.27[1] cgs
Temperature4,717[1] K
Metallicity [Fe/H]0.156[1] dex
Rotational velocity (v sin i)<1[5] km/s
Age217[1] Myr
Other designations
η3 For, CD−36°1070, HD 17829, HIP 13265, HR 848, SAO 193944[6]
Database references
SIMBADdata

Eta3 Fornacis (η3 Fornacis) is an orange giant in the constellation of Fornax. The star has a spectral type of K2III and an apparent magnitude of 5.47.[7] The star is visually close to, but unrelated with the similar stars η2 Fornacis and η1 Fornacis.[7] The star is located at approximately 489 light years away with a luminosity of about 249 L☉, and is a suspected binary system with the primary being the orange giant.[8]

References

  1. ^ a b c d e f g h i j k l m 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 Hoffleit, D.; Warren, Jr., W. H. (1991). The Bright Star Catalogue (5th Revised ed.). New Haven: Astronomical Data Center, NSSDC/ADC. Bibcode:1964cbs..book.....H.
  3. ^ Houk, Nancy; Smith-Moore, M. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  4. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  5. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  6. ^ "* eta03 For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-09-28.
  7. ^ a b "η3 Fornacis (eta3 Fornacis)". The Sky Live. Retrieved 28 September 2023.
  8. ^ "Eta3 Fornacis Star Facts (Distance, Colour etc.)". Universe Guide. Retrieved 28 September 2023.
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