HD 173791
HD 173791 (30 G. Telescopium), also known as HR 7065, is a giant star in the constellation Telescopium, located about 358 light-years (110 parsecs) from Earth. It has an apparent magnitude of +5.8, allowing it to be viewed with the naked eye under suitable viewing conditions. The stellar classification is G8III, which indicates that it has evolved from a main sequence star and has expanded into a giant with three times the Sun's radius.[5] The effective temperature of its chromosphere is 5,200 K,[4] giving it the characteristic yellow hue of a G-type star.[8]
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 49m 27.34329s[1] |
| Declination | –45° 48′ 36.3665″[1] |
| Apparent magnitude (V) | 5.802 |
| Characteristics | |
| Evolutionary stage | Giant |
| Spectral type | G8 III[2] |
| Astrometry | |
| Radial velocity (Rv) | 9.7[3] km/s |
| Proper motion (μ) | RA: 73.85[1] mas/yr Dec.: 56.57[1] mas/yr |
| Parallax (π) | 9.10 ± 0.31[1] mas |
| Distance | 360 ± 10 ly (110 ± 4 pc) |
| Absolute magnitude (MV) | 0.201 |
| Details | |
| Mass | 1[4] M☉ |
| Radius | 3.0[5] R☉ |
| Temperature | 5,200[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
It has an estimated lifespan of 10 billion years and has about the same mass as the Sun. After passing through the giant stage, its end state will probably be a carbon-oxygen white dwarf.[4]
References
- van Leeuwen, F. (November 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
- Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor : Dept. of Astronomy, Bibcode:1978mcts.book.....H
- Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, University of Toronto: International Astronomical Union, 30: 57, Bibcode:1967IAUS...30...57E
- Wolfram|Alpha: HIP 92367, WolframAlpha, October 26, 2011, archived from the original on January 10, 2012, retrieved 2011-12-16
- Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451 Note: see VizieR catalogue J/A+A/367/521.
- Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
- "HR 7065 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-19
- "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16