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 mas[1] |
| Distance | approx. 1,100 ly (approx. 330 pc) |
| Details | |
| Radius | 56[7] R☉ |
| Luminosity | 2,973[8] L☉ |
| Temperature | 4,030[8] K |
| Other designations | |
| ξ Tel, CPD−53° 9794, FK5 755, HD 190421, HIP 99120, HR 7673, SAO 246443[9] | |
Xi Telescopii (ξ Tel, ξ Telescopii) is a solitary[5] star in the southern constellation of Telescopium.[9] 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.
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] It shines with a luminosity approximately 2,973 times that of the Sun and has a surface temperature of 4,030 K.[8]
References
- ^ a b c d e f 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.
- ^ a b c d 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.
- ^ a b c Watson, Christopher (May 3, 2013). "NSV 12783". AAVSO Website. American Association of Variable Star Observers. Retrieved 2017-06-03.
{{cite web}}: CS1 maint: postscript (link) - ^ a b Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ a b c 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.
- ^ Wielen, R.; et al. (2000), "Sixth Catalogue of Fundamental Stars (FK6). Part III. Additional fundamental stars with direct solutions", Veröffentlichungen Astronomisches Rechen-Institut Heidelberg, no. 37, Karlsruhe: Verlag G. Braun, pp. 1–308, Bibcode:2000VeARI..37....1W, ISBN 3-7650-0536-3.
- ^ Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics, 367 (3rd ed.): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ^ a b c 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.
- ^ a b "ksi Tel -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-01.
