Iota Telescopii

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Iota Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 35m 12.98589s[1]
Declination −48° 05′ 57.1238″[1]
Apparent magnitude (V) +4.89[2]
Characteristics
Spectral type K0 III[3]
B−V color index +1.09[2]
Astrometry
Radial velocity (Rv)+22.3[4] km/s
Proper motion (μ) RA: −7.872[1] mas/yr
Dec.: −36.532[1] mas/yr
Parallax (π)9.4237 ± 0.1796[1] mas
Distance346 ± 7 ly
(106 ± 2 pc)
Absolute magnitude (MV)−0.39[5]
Details
Mass1.19[6] M☉
Radius19.09+0.37
−0.70[1] R☉
Luminosity157.4±3.5[1] L☉
Surface gravity (log g)1.88[7] cgs
Temperature4,680+87
−55[1] K
Metallicity [Fe/H]–0.01[6] dex
Rotational velocity (v sin i)1.8±1.3[8] km/s
Other designations
ι Tel, CD−48° 13161, FK5 735, HD 184127, HIP 96341, HR 7424, SAO 229751[9]
Database references
SIMBADdata

ι Telescopii, Latinized as Iota Telescopii and abbreviated iot Tel, is a solitary[10] star in the southern constellation of Telescopium. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of +4.89.[2] The star is located approximately 347 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s.[4]

This object is an aging K-type giant star with a stellar classification of K0 III,[3] which indicates it has exhausted the supply of hydrogen at its core then cooled and expanded. At present it has 1.19 times the mass of the Sun,[6] but 19 times the radius of the Sun It is radiating 157 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,680 K.[1] Iota Telescopii has a low projected rotational velocity of 1.8 km/s,[8] and has a near solar metallicity.[6]

References[]

  1. ^ a b c d e f g h i 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.
  2. ^ a b c Cousins, A. W. J.; et al. (1966), "Photoelectric magnitudes and colours of southern stars, II", Royal Observatory Bulletins, 121, Bibcode:1966RGOB..121....1C.
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ a b Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
  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, S2CID 119257644.
  6. ^ a b c d Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  7. ^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (October 2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471: 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. ISSN 0035-8711.
  8. ^ a b 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 and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  9. ^ "iot Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-05.{{cite web}}: CS1 maint: postscript (link)
  10. ^ 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, S2CID 14878976.
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