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]
| 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 mas[1] |
| Distance | 111 ± 2 ly (33.9 ± 0.5 pc) |
| Absolute magnitude (MV) | 3.08[6] |
| Details | |
| ι For A | |
| Mass | 1.42[7] M☉ |
| Radius | 1.4[8] R☉ |
| Surface gravity (log g) | 3.47[4] cgs |
| Temperature | 6,366[6] K |
| Metallicity [Fe/H] | −0.41[4] dex |
| Rotational velocity (v sin i) | 4.7±0.2[6] km/s |
| Age | 3.67[9] Gyr |
| ι For B | |
| Mass | 0.35[7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 arcseconds along a position angle of 6°.[3] This object has about 35% of the Sun's mass.[7]
References
edit- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c Johnson, H. L.; et al. (1999). "UBVRIJKL photometry of the bright stars". Commission Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ a b 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.
- ^ a b c d 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, S2CID 119476992.
- ^ 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, S2CID 59451347, A61.
- ^ a b c d Ammler-von Eiff, Matthias; Reiners, Ansgar (June 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, S2CID 53666672.
- ^ a b c d 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. S2CID 56066740. 87.
- ^ a b 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 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c 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, S2CID 17316450.
- ^ "iot02 For -- High proper-motion Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-01-23.
- ^ 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.