Kappa Telescopii

Kappa Telescopii (κ Telescopii) is a solitary,^[8] yellow-hued star in the southern constellation of Telescopium. With an apparent visual magnitude of +5.20,^[2] it is visible to the naked eye. Based upon an annual parallax shift of 12.00 mas as seen from Earth,^[1] it is located around 272 light years from the Sun.

Kappa Telescopii

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18h 52m 39.64405s[1]
Declination	−52° 06′ 26.5372″[1]
Apparent magnitude (V)	+5.20[2]
Characteristics
Spectral type	G8/K0 III[3]
B−V color index	+0.96[2]
Astrometry
Radial velocity (Rv)	−44.3[4] km/s
Proper motion (μ)	RA: +39.92[1] mas/yr Dec.: −96.17[1] mas/yr
Parallax (π)	12.00 ± 0.27 mas[1]
Distance	272 ± 6 ly (83 ± 2 pc)
Absolute magnitude (MV)	+0.41±0.14[5]
Details[6]
Mass	1.92 M☉
Radius	10.51 R☉
Luminosity	77.6 L☉
Surface gravity (log g)	2.79 cgs
Temperature	4,968 K
Metallicity [Fe/H]	−0.25 dex
Rotational velocity (v sin i)	2.63 km/s
Age	1.25 Gyr
Other designations
κ Tel, CPD−52° 11268, FK5 3499, HD 174295, HIP 92646, HR 7087, SAO 245772[7]
Database references
SIMBAD	data

At the age of around 1.25 billion years,^[6] this an evolved giant star with a stellar classification of G8/K0 III,^[3] showing a spectrum with characteristics intermediate between a G-type and a K-type star. It has an estimated 1.9 times the mass of the Sun and 10.5 times the Sun's radius.^[6] The star is radiating 77.6 times the solar luminosity from its photosphere at an effective temperature of 4,968 K.^[6] It is unclear whether it is cooling or heating up on its evolutionary pathway through the red clump.^[5]

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. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
3. 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.
4. Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
5. da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088.
6. Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
7. "kap Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-05.{{cite web}}: CS1 maint: postscript (link)
8. 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.