Astronomy:Epsilon Telescopii

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Short description: Star in the constellation Telescopus
ε Telescopii
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −38.102[1] mas/yr
Parallax (π)8.0405 ± 0.321[1] mas
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

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.

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. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  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. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H. 
  4. ↑ 4.0 4.1 4.2 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M. 
  8. ↑ 8.0 8.1 8.2 8.3 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, doi:10.1093/mnras/stv189, Bibcode: 2015MNRAS.448.2749A.  Per the comments in the paper, this lists the TS13 data.
  9. ↑ "* eps Tel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+eps+Tel. 
  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  11. ↑ Zuckerman, B. et al. (June 1995), "Luminosity Class III Stars with Excess Far-Infrared Emission", Astrophysical Journal Letters 446: L79, doi:10.1086/187935, Bibcode: 1995ApJ...446L..79Z. 
  12. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22 



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