Xi Telescopii

Xi Telescopii, Latinized from ξ Telescopii, is a solitary[5] star in the southern constellation of Telescopium.[10] It is visible to the naked eye, with an apparent visual magnitude of +4.95.[2] Based upon an annual parallax shift of 3.02 mas as measured from Earth,[1] it is located approximately 1,100 light years from the Sun.

Xi Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 20h 07m 23.15599s[1]
Declination −52° 52′ 50.8490″[1]
Apparent magnitude (V) 4.95[2] (+4.89 – 4.94)[3]
Characteristics
Spectral type K5 III[4] or M1 IIab[5]
U−B color index +1.90[2]
B−V color index +1.61[2]
Variable type LB:[3]
Astrometry
Radial velocity (Rv)+36.0[6] km/s
Proper motion (μ) RA: −12.98[1] mas/yr
Dec.: +7.50[1] mas/yr
Parallax (π)3.02 ± 0.35[1] mas
Distanceapprox. 1,100 ly
(approx. 330 pc)
Absolute magnitude (MV)−2.64[7]
Details
Radius56[8] R☉
Luminosity2,973[9] L☉
Temperature4,030[9] K
Other designations
ξ Tel, CPD−53° 9794, FK5 755, HD 190421, HIP 99120, HR 7673, SAO 246443[10]
Database references
SIMBADdata

This is an evolved star with a stellar classification of K5 III[4] or M1 IIab,[5] indicating it is a giant or bright giant star. This is a variable star tentatively classified as a slow irregular type variable with a brightness that varies between magnitude +4.89 and +4.94.[3] With around 56[8] times the Sun's radius, it shines with a luminosity approximately 2,973 times that of the Sun and has a surface temperature of 4,030 K.[9]

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. Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
  3. Watson, Christopher (May 3, 2013). "NSV 12783". AAVSO Website. American Association of Variable Star Observers. Retrieved 2017-06-03.
  4. Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  5. 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.
  6. Wielen, R.; et al. (2000), "Sixth Catalogue of Fundamental Stars (FK6). Part III. Additional fundamental stars with direct solutions", Veröffentlichungen Astronomisches Rechen-Institut Heidelberg, Karlsruhe: Verlag G. Braun, 37 (37), pp. 1–308, Bibcode:2000VeARI..37....1W, ISBN 3-7650-0536-3.
  7. 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.
  8. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  9. 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.
  10. "ksi Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-01.
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