Astronomy:Xi Telescopii
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 20h 07m 23.15599s[2] |
| Declination | −52° 52′ 50.8490″[2] |
| Apparent magnitude (V) | 4.95[3] (+4.89 – 4.94)[4] |
| Characteristics | |
| Spectral type | K5 III[5] or M1 IIab[6] |
| U−B color index | +1.90[3] |
| B−V color index | +1.61[3] |
| Variable type | LB:[4] |
| Astrometry | |
| Radial velocity (Rv) | +36.0[7] km/s |
| Proper motion (μ) | RA: −12.98[2] mas/yr Dec.: +7.50[2] mas/yr |
| Parallax (π) | 3.02 ± 0.35[2] mas |
| Distance | approx. 1,100 ly (approx. 330 pc) |
| Absolute magnitude (MV) | −2.64[8] |
| Details | |
| Radius | 56[9] R☉ |
| Luminosity | 2,973[10] L☉ |
| Temperature | 4,030[10] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Telescopii, Latinized from ξ Telescopii, is a solitary[6] star in the southern constellation of Telescopium.[11] It is visible to the naked eye, with an apparent visual magnitude of +4.95.[3] Based upon an annual parallax shift of 3.02 mas as measured from Earth,[2] it is located approximately 1,100 light-years from the Sun.
This is an evolved star with a stellar classification of K5 III[5] or M1 IIab,[6] 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.[4] Koen and Eyer examined the Hipparcos data for this star, and found that it varied periodically, with a period of 12.36 days, and an amplitude of 0.0083 magnitudes.[12] With around 56[9] 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.[10]
References
- ↑ /ftp/cats/more/HIP/cdroms/cats, Strasbourg astronomical Data Center, https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats, retrieved 15 October 2022.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 3.0 3.1 3.2 3.3 Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series 52: 7–22, doi:10.1086/190856, Bibcode: 1983ApJS...52....7F.
- ↑ 4.0 4.1 4.2 Watson, Christopher (May 3, 2013). "NSV 12783". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=51407.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 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.
- ↑ 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, ISBN 3-7650-0536-3, Bibcode: 2000VeARI..37....1W.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 9.0 9.1 Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics 367: 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 10.0 10.1 10.2 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.
- ↑ 11.0 11.1 "ksi Tel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ksi+Tel.
- ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K.
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