HD 173791

HD 173791
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
Distance360 ± 10 ly
(110 ± 4 pc)
Absolute magnitude (MV)0.201
Details
Mass1[4] M☉
Radius3.0[5] R☉
Temperature5,200[4] K
Other designations
30 G. Telescopium,[6] HD 173791, CPD−45 9479, SAO 229306, FK5 3495, HIP 92367.[7]

HD 173791 (30 G. Telescopium) 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]

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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
  2. ↑ Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor : Dept. of Astronomy, Bibcode:1978mcts.book.....H
  3. ↑ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, ed., "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
  4. ↑ 4.0 4.1 4.2 4.3 Wolfram|Alpha: HIP 92367, WolframAlpha, October 26, 2011, retrieved 2011-12-16
  5. ↑ 5.0 5.1 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.
  6. ↑ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, retrieved 2012-01-06
  7. ↑ "HR 7065 -- Star", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 2011-12-19
  8. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16