Zeta Telescopii

Zeta Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 28m 49.85937s[1]
Declination −49° 04′ 14.1180″[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)−29.75±0.19[1] km/s
Proper motion (μ) RA: +139.344 mas/yr[1]
Dec.: −229.844 mas/yr[1]
Parallax (π)26.6984 ± 0.1406 mas[1]
Distance122.2 ± 0.6 ly
(37.5 ± 0.2 pc)
Absolute magnitude (MV)1.27±0.03[5]
Details[5]
Mass1.41±0.07 M☉
Radius8.27±0.15 R☉
Luminosity33.30±0.85 L☉
Surface gravity (log g)2.84±0.077 cgs
Temperature4,824±31 K
Metallicity [Fe/H]−0.126±0.022 dex
Other designations
ζ Tel, CD−49° 12153, HD 169767, HIP 90568, HR 6905, SAO 229047[6]
Database references
SIMBADdata

Zeta Telescopii (ζ Telescopii) is the second-brightest star in the southern constellation of Telescopium. It is a solitary,[7] 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 26.7 mas as seen from Earth,[1] it is located around 122 light years from the Sun.

This is a red clump[2] giant star of spectral type K1 III-IV.[3] It is just 40% more massive than the Sun, but has a radius eight times larger and shines with about 30 times its luminosity. The surface of Zeta Telescopii has an effective temperature of 4,824 K,[8] giving it the orange hue typical of K-type stars.[9]

References

  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c 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. ^ a b 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. ^ a b 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. ^ a b Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (2022-01-01). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy and Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Zeta Telescopii's database entry at VizieR.
  6. ^ "zet Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-06.
  7. ^ 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.
  8. ^ 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.
  9. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16