Iota2 Fornacis

Iota2 Fornacis is the Bayer designation for a star in the southern constellation of Fornax. It is faintly visible to the naked eye on a dark night, having an apparent visual magnitude of 5.83.[2] The distance to this star, based upon an annual parallax shift of 29.46 mas, is around 111 light years.[1] It is a member of the thin disk population of the Milky Way galaxy.[9]

For other stars with this Bayer designation, see ι Fornacis.
Iota2 Fornacis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Fornax
Right ascension 02h 38m 18.66152s[1]
Declination −30° 11′ 38.6284″[1]
Apparent magnitude (V) 5.83[2] + 13.74[3]
Characteristics
Spectral type F6 V Fe-0.7 CH-0.4[4]
B−V color index +0.48[2]
Astrometry
Radial velocity (Rv)29.0±2.9[5] km/s
Proper motion (μ) RA: +97.59[1] mas/yr
Dec.: −74.25[1] mas/yr
Parallax (π)29.46 ± 0.40[1] mas
Distance111 ± 2 ly
(33.9 ± 0.5 pc)
Absolute magnitude (MV)3.08[6]
Details
ι For A
Mass1.42[7] M☉
Radius1.4[8] R☉
Surface gravity (log g)3.47[4] cgs
Temperature6,366[6] K
Metallicity [Fe/H]−0.41[4] dex
Rotational velocity (v sin i)4.7±0.2[6] km/s
Age3.67[9] Gyr
ι For B
Mass0.35[7] M☉
Other designations
ι For, CD−30° 973, HD 16538, HIP 12288, HR 777, SAO 193829.[10]
Database references
SIMBADdata

This is an F-type main sequence star with a stellar classification of F6 V Fe-0.7 CH-0.4.[4] The suffix notation indicates that absorption lines of iron and the carbon-hydrogen G-band are abnormally weak.[11] It has an estimated 1.42[7] times the mass of the Sun and 1.4[8] times the Sun's radius. The star is around 3.67 billion years old,[9] and is spinning with a leisurely projected rotational velocity of 4.7 km/s.[6]

Iota2 Fornacis has a common proper motion companion, a magnitude 13.74 star at a position angle of 81.80 arc seconds along a position angle of 6°.[3] This object has about 35% of the Sun's mass.[7]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Johnson, H. L.; et al. (1999). "UBVRIJKL photometry of the bright stars". Commission Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  3. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  4. Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. Ammler-von Eiff, M.; Reiners, A. (2012), "New measurements of rotation and differential rotation in A-F stars: Are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.
  7. Tokovinin, Andrei (2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 14. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87. 87.
  8. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  9. Ibukiyama, A.; Arimoto, N. (November 2002), "HIPPARCOS age-metallicity relation of the solar neighbourhood disc stars", Astronomy and Astrophysics, 394: 927–941, arXiv:astro-ph/0207108, Bibcode:2002A&A...394..927I, doi:10.1051/0004-6361:20021157.
  10. "iot02 For -- High proper-motion Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-01-23.
  11. Keenan, P. C. (1985), "The MK classification and its calibration", Proceedings of the Symposium, calibration of fundamental stellar quantities, Dordrecht: D. Reidel Publishing Co., pp. 121−135, Bibcode:1985IAUS..111..121K.
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