Iota Reticuli

ι Reticuli, Latinized as Iota Reticuli, is a solitary,[8] orange-hued star in the southern constellation of Reticulum. It is faintly visible to the naked eye, having a combined apparent visual magnitude of +4.97.[2] Based upon an annual parallax shift of 10.22 mas as seen from Earth,[1] it is located around 319 light years from the Sun. At present it is receding from the Sun with a radial velocity of +61 km/s,[4] having come closest to the Sun 883,000 years ago at a distance of 212 light years.[9] Iota Reticuli is moving through the Galaxy at a speed of 80.9 km/s relative to the Sun. Its projected Galactic orbit carries it between 12,300 and 25,100 light years from the center of the Galaxy.[9]

Iota Reticuli
Location of ι Reticuli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Reticulum
Right ascension 04h 01m 18.15162s[1]
Declination −61° 04′ 43.7559″[1]
Apparent magnitude (V) +4.97[2]
Characteristics
Spectral type K4 III[3]
U−B color index +1.70[2]
B−V color index +1.42[2]
Astrometry
Radial velocity (Rv)+60.5±0.8[4] km/s
Proper motion (μ) RA: +66.79[1] mas/yr
Dec.: +94.80[1] mas/yr
Parallax (π)10.22 ± 0.16[1] mas
Distance319 ± 5 ly
(98 ± 2 pc)
Absolute magnitude (MV)+0.02[5]
Details
Radius24.3+1.9
−4.7[6] R☉
Luminosity179.8±5.1[6] L☉
Temperature4290+261
−158[6] K
Other designations
ι Ret, CPD−61° 293, HD 25728, HIP 18772, HR 1266, SAO 248927[7]
Database references
SIMBADdata

This is an evolved K-type giant star with a stellar classification of K4 III.[3] Having exhausted the supply of hydrogen at its core, the star cooled and expanded off the main sequence; at present it has 24[6] times the girth of the Sun. It is radiating 180[6] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,290 K.[6]

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. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  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. 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.
  6. 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.
  7. "iot Ret". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-14.
  8. 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.
  9. 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.
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