Epsilon Telescopii

Epsilon Telescopii, Latinized from ε Telescopii, is a solitary,[10] orange-hued star in the southern constellation of Telescopium. It is visible to the naked eye with an apparent visual magnitude of +4.53.[4] Based upon an annual parallax shift of 7.80 mas as seen from Earth,[1] it is located roughly 410 light years from the Sun, give or take 20 light years.

ε Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 11m 13.7612s[1]
Declination −45° 57′ 15.8824″[1]
Apparent magnitude (V) 4.50±0.01[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.78[4]
B−V color index +1.01[4]
Astrometry
Radial velocity (Rv)−26.3±0.8[5] km/s
Proper motion (μ) RA: −18.837 mas/yr[1]
Dec.: −38.102 mas/yr[1]
Parallax (π)8.0405 ± 0.321 mas[1]
Distance410 ± 20 ly
(124 ± 5 pc)
Absolute magnitude (MV)−1.00[6]
Details
Luminosity293[7] L☉
Surface gravity (log g)2.32±0.12[8] cgs
Temperature4,996±42[8] K
Metallicity [Fe/H]−0.07±0.04[8] dex
Other designations
ε Tel, CD−45° 12251, FK5 1473, HD 166063, HIP 89112, HR 6783, SAO 228777[9]
Database references
SIMBADdata

This an evolved K-type giant with a stellar classification of K0 III.[3] It displays an infrared excess, suggesting the presence of an orbiting disk of dust.[11] The star is radiating 293[7] times the Sun's luminosity from its photosphere at an effective temperature of 4,996 K.[8] It has a 13th magnitude optical companion at an angular separation of 16.30 arcseconds along a position angle of 233°, as of 2000.[12]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  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. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  6. 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.
  7. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  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. Per the comments in the paper, this lists the TS13 data.
  9. "* eps Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-07.{{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.
  11. Zuckerman, B.; et al. (June 1995), "Luminosity Class III Stars with Excess Far-Infrared Emission", Astrophysical Journal Letters, 446: L79, Bibcode:1995ApJ...446L..79Z, doi:10.1086/187935.
  12. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
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