Iota Telescopii
ι Telescopii, Latinized as Iota Telescopii and abbreviated iot Tel, is a solitary[7] star in the southern constellation of Telescopium. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of +4.89.[2] The star is located approximately 347 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 35m 12.98589s[1] |
| Declination | −48° 05′ 57.1238″[1] |
| Apparent magnitude (V) | +4.89[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | +1.09[2] |
| Astrometry | |
| Radial velocity (Rv) | +22.3[4] km/s |
| Proper motion (μ) | RA: −7.872[1] mas/yr Dec.: −36.532[1] mas/yr |
| Parallax (π) | 9.4237 ± 0.1796[1] mas |
| Distance | 346 ± 7 ly (106 ± 2 pc) |
| Absolute magnitude (MV) | −0.39[5] |
| Details | |
| Radius | 19.09+0.37 −0.70[1] R☉ |
| Luminosity | 157.4±3.5[1] L☉ |
| Temperature | 4,680+87 −55[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an aging K-type giant star with a stellar classification of K0 III,[3] which indicates it has exhausted the supply of hydrogen at its core then cooled and expanded. At present it has 19 times the radius of the Sun. It is radiating 157 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,680 K.[1]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Cousins, A. W. J.; et al. (1966), "Photoelectric magnitudes and colours of southern stars, II", Royal Observatory bulletins, 121, Bibcode:1966RGOB..121....1C.
- Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
- 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.
- "iot 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.