Iota Crateris

Iota Crateris (ι Crateris) is the Bayer designation for a binary star[10] system in the southern constellation of Crater. It is faintly visible to the naked eye with an apparent visual magnitude of 5.48.[2] According to the Bortle scale, this means it can be viewed from suburban skies at night. Based upon an annual parallax shift of 37.41 mas,[1] Iota Crateris is located 87 light years from the Sun.

ι Crateris
Location of ι Crateris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater
Right ascension  11h 38m 40.01668s[1]
Declination −13° 12′ 06.9963″[1]
Apparent magnitude (V) 5.48[2]
Characteristics
Spectral type F6.5 V[3]
B−V color index +0.52[2]
Astrometry
Radial velocity (Rv)−26.6±0.3[4] km/s
Proper motion (μ) RA: +99.52[1] mas/yr
Dec.: +125.99[1] mas/yr
Parallax (π)37.41 ± 0.30[1] mas
Distance87.2 ± 0.7 ly
(26.7 ± 0.2 pc)
Absolute magnitude (MV)+3.33[5]
Details
ι Crt A
Mass1.19+0.06
−0.02[6] M☉
Surface gravity (log g)4.27±0.03[7] cgs
Temperature6,230±21[7] K
Metallicity [Fe/H]−0.15±0.01[7] dex
Age4.45+0.32
−0.94[6] Gyr
ι Crt B
Mass0.57[8] M☉
Other designations
ι Crt, 24 Crateris, BD−12° 3466, GJ 3677, HD 101198, HIP 56802, HR 4488, SAO 156802.[9]
Database references
SIMBADdata

This is an astrometric binary system with an estimated orbital period of roughly 79,000 years.[10] The primary, component A, is an F-type main sequence star with a stellar classification of F6.5 V,[3] which is generating energy through the thermonuclear fusion of hydrogen in its core region. It is around 4.45[6] billion years old with 1.19[6] times the mass of the Sun. The star is radiating energy from its outer atmosphere at an effective temperature of 6,230 K.[7]

The companion, component B, is a red dwarf star with a probable classification of M3, although its mass estimate of 0.57 solar would be more consistent with an M0 class star.[8] As of 2014, this magnitude 11.0 star had an angular separation of 1.10 arc seconds along a position angle of 248°.[11] It has a projected separation of 25 AU,[8] which means it is positioned at least this distance away from the primary.

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. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  3. Gray, R. O.; et al. (July 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): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. 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.
  5. Lambert, David L.; Reddy, Bacham E. (April 2004), "Lithium abundances of the local thin disc stars", Monthly Notices of the Royal Astronomical Society, 349 (2): 757−767, arXiv:astro-ph/0401259, Bibcode:2004MNRAS.349..757L, doi:10.1111/j.1365-2966.2004.07557.x.
  6. Ramírez, I.; et al. (September 2012), "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets", The Astrophysical Journal, 756 (1): 46, arXiv:1207.0499, Bibcode:2012ApJ...756...46R, doi:10.1088/0004-637X/756/1/46.
  7. Adibekyan, V.; et al. (August 2016), "Abundance trend with condensation temperature for stars with different Galactic birth places", Astronomy & Astrophysics, 592: 12, arXiv:1606.04714, Bibcode:2016A&A...592A..87A, doi:10.1051/0004-6361/201628883, A87.
  8. Ehrenreich, D.; et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics, 523: 41, arXiv:1007.0002, Bibcode:2010A&A...523A..73E, doi:10.1051/0004-6361/201014763, A73.
  9. "iot Crt -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-26.
  10. 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.
  11. 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.
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