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.
| 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[1] mas |
| 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 | |
| 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
- 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.
- 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.
- 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.
- 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, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode:1999VeARI..35....1W.
- 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.
- 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.
- "kap Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-05.
- 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.