HD 179886

HD 179886 (HR 7289) is a solitary[11] star located in the southern constellation Telescopium. It has an apparent magnitude of 5.37, making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of 700 light years but is recceding with a heliocentric radial velocity of 6.3 km/s.

HD 179886
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 16m 21.7422s[1]
Declination −45° 27′ 57.7041″[1]
Apparent magnitude (V) 5.371±0.09[2]
Characteristics
Spectral type K3 III[3]
B−V color index +1.35[4]
Astrometry
Radial velocity (Rv)6.3±0.8[5] km/s
Proper motion (μ) RA: −3.013[1] mas/yr
Dec.: +10.017[1] mas/yr
Parallax (π)4.6441 ± 0.1537 mas[1]
Distance700 ± 20 ly
(215 ± 7 pc)
Absolute magnitude (MV)−0.7[6]
Details
Mass1.11[7] M☉
Radius36.75[8] R☉
Luminosity365[9] L☉
Surface gravity (log g)1.3[7] cgs
Temperature4,622[9] K
Metallicity [Fe/H]+0.15[7] dex
Rotational velocity (v sin i)2.4±1.1[10] km/s
Other designations
51 G. Telescopii, CD−45°13072, CPD−45°9660, GC 26526, HD 179886, HIP 94712, HR 7289, SAO 229584, WDS J19164-4528AB
Database references
SIMBADdata

HD 179886 has a stellar classification of K3 III, indicating that the object is an ageing K-type giant. It has an angular diameter of 1.95±0.03,[12] yielding a diameter 37 times that of the Sun[8] at its estimated distance. At present it has 111% the mass of the Sun[7] and radiates at 365 L☉[9] from its enlarged photosphere at an effective temperature of 4,622 K,[9] giving it an orange glow. HD 179886 has a metallicity 141% that of the Sun[7] and spins modestly with a projected rotational velocity of 2.4 km/s.[10]

HD 179886 has a companion separated 0.4 arcseconds away.[13] It's most likely a background star unrelated to the star.

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
  4. Corben, P. M. (1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30: 37. Bibcode:1971MNSSA..30...37C. ISSN 0024-8266.
  5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  6. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  7. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  8. 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.
  9. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711.
  10. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  11. 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
  12. Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005). "CHARM2: An updated Catalog of High Angular Resolution Measurements". Astronomy & Astrophysics. 431 (2): 773–777. Bibcode:2005A&A...431..773R. doi:10.1051/0004-6361:20042039. ISSN 0004-6361.
  13. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
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