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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 mas[1]
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, vol. 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.

На других языках

[de] Zeta Telescopii

ζ Telescopii (Zeta Telescopii; kurz ζ Tel) ist mit einer scheinbaren Helligkeit von 4,13m der zweithellste Stern des nur vom Südhimmel aus sichtbaren Sternbilds Teleskop.[2] Dennoch erscheint der orangefarben leuchtende Stern dem bloßen Auge relativ lichtschwach. Nach im Dezember 2020 veröffentlichten Auswertungen der Messergebnisse der Raumsonde Gaia ist der Stern etwa 122 Lichtjahre von der Erde entfernt.[1] Er dürfte ein Einzelstern sein.[8]
- [en] Zeta Telescopii


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