Epsilon Telescopii

Technopedia Center

Faculty of Engineering and Computer Science
S1 Informatics S1 Information Systems S1 Information Technology S1 Computer Engineering S1 Electrical Engineering S1 Civil Engineering

faculty of Economics and Business
S1 Management S1 Accountancy

Faculty of Letters and Educational Sciences
S1 English literature S1 English language education S1 Mathematics education S1 Sports Education

Epsilon Telescopii - Wikipedia

From Wikipedia, the free encyclopedia

ε Telescopii
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18^h 11^m 13.7612^s^[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 (R_v)	−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]
Distance	410 ± 20 ly (124 ± 5 pc)
Absolute magnitude (M_V)	−1.00^[6]

Details

Luminosity	293^[7] `L`_☉
Surface gravity (log g)	2.32±0.12^[8] cgs
Temperature	4,996±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
SIMBAD	data

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

^ ^a ^b ^c ^d ^e 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.
^ 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.
^ ^a ^b 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.
^ ^a ^b ^c 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.
^ 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.
^ 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.
^ ^a ^b 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.
^ ^a ^b ^c ^d 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.
^ "* eps Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-07.{{cite web}}: CS1 maint: postscript (link)
^ 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.
^ 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.
^ 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

Constellation of Telescopium

Stars

Bayer	α δ¹ δ² ε ζ η ι κ λ μ ν ξ ρ τ
Variable	RR RS RX BL HO PV PW PZ QQ QS QU QV
HR	6778 6821 6894 6954 6986 7065 7092 7093 7095 7097 7190 7223 7233 7271 7289 7297 7370 7388 7411 7459 7521 7537 7548 7549 7621 7674 7714 7745 7749 7758 7766
HD	168871 173047 177365 181295 191760
Other	KELT-10 Gliese 754 Gliese 784 GJ 1252

Exoplanets	Gliese 754 b Gliese 784 b GJ 1252 b KELT-10b

Star clusters	NGC 6584

Galaxies

NGC	6845 6861
Other	PKS 2014-55