Zeta Telescopii

Zeta Telescopii (ζ Telescopii) is the second-brightest star in the southern constellation of Telescopium. It is a solitary,[9] orange-hued star that is visible to the naked eye with an apparent visual magnitude of +4.13.[2] Based upon an annual parallax shift of 25.84 mas as seen from Earth,[1] it is located around 127 light years from the Sun.

Zeta Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 28m 49.85980s[1]
Declination −49° 04′ 14.1122″[1]
Apparent magnitude (V) +4.13[2]
Characteristics
Spectral type K1 III-IV[3]
U−B color index +0.82[4]
B−V color index +1.02[4]
Astrometry
Radial velocity (Rv)−30.6[5] km/s
Proper motion (μ) RA: +139.10[1] mas/yr
Dec.: −228.66[1] mas/yr
Parallax (π)25.84 ± 0.21[1] mas
Distance126 ± 1 ly
(38.7 ± 0.3 pc)
Absolute magnitude (MV)1.171[2]
Details
Mass1.53[2] M☉
Radius9[6] R☉
Surface gravity (log g)2.78±0.09[7] cgs
Temperature4,801±39[7] K
Metallicity [Fe/H]−0.19±0.03[7] dex
Other designations
ζ Tel, CD−49° 12153, HD 169767, HIP 90568, HR 6905, SAO 229047[8]
Database references
SIMBADdata

This is a red clump[2] giant star of spectral type K1 III-IV.[3] The measured angular diameter is 2.16±0.11 mas.[10] At its estimated distance, this yields a physical size of about 9 times the radius of the Sun.[6] It is around 1.53[2] times as massive as the Sun and it shines at an effective temperature of 4,801 K.[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, S2CID 18759600.
  2. Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
  3. 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.
  4. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  5. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  6. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189, S2CID 119217930. Per the comments in the paper, this lists the TS13 data.
  8. "zet Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-06.
  9. 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.
  10. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
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