Astronomy:HD 168592

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Short description: Star in the constellation of Corona Australis
HD 168592
Location of HD 168592 (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Corona Australis
Right ascension  18h 22m 18.57340s[1]
Declination −38° 39′ 24.8261″[1]
Apparent magnitude (V) 5.07±0.01[2]
Characteristics
Spectral type K4/5 III[3]
B−V color index +1.49[4]
Astrometry
Radial velocity (Rv)17.8±2.8[5] km/s
Proper motion (μ) RA: −41.570[1] mas/yr
Dec.: −29.379[1] mas/yr
Parallax (π)6.7176 ± 0.1706[1] mas
Distance490 ± 10 ly
(149 ± 4 pc)
Absolute magnitude (MV)−0.76[6]
Details
Mass1.18[7] M☉
Radius43.6±2.2[8] R☉
Luminosity666+44−40[1] L☉
Surface gravity (log g)1.34[7] cgs
Temperature4,148±122[9] K
Metallicity [Fe/H]−0.13±0.01[10] dex
Rotational velocity (v sin i)1.9±1.3[11] km/s
Other designations
Magur, CD−38°12729, CPD−38°7475, GC 25051, HD 168592, HIP 90037, HR 6862, SAO 210048[12]
Database references
SIMBADdata

HD 168592, also designated HR 6862 and named Magur,[13] is a solitary star[14] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years[1] and is currently receding with a heliocentric radial velocity of 18 km/s.[5] At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust.[15] It has an absolute magnitude of −0.76.[6]

HD 168592 has a stellar classification of K4/5 III,[3] indicating that it is an evolved K-type star with the characteristics of a K4 and K5 giant star. It has a comparable mass to the Sun[7] but the star has expanded to 43.6 times the Sun's radius.[8] It radiates 666 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,148 K.[9] HD 168592 is slightly metal deficient with an iron abundance 26% below solar levels.[10] The star spins slowly, as is common for giant stars, with a projected rotational velocity of 1.9 km/s.[11]

MA2.GUR8, the Boat, is an ancient Sumerian constellation in the region south of Sagittarius. The IAU Working Group on Star Names (WGSN) adopted the name Magur for this star on 13 August 2026; as identification is uncertain, the WGSN chose a faint star near η Sagittarii (Heryibwia), which represents an Egyptian boat constellation.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  4. ↑ Corben, P. M.; Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa 27: 11. ISSN 0024-8266. Bibcode: 1968MNSSA..27...11C. 
  5. ↑ 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  8. ↑ 8.0 8.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Poggio, E.; Recio-Blanco, A.; Palicio, P. A.; Re Fiorentin, P.; de Laverny, P.; Drimmel, R.; Kordopatis, G.; Lattanzi, M. G. et al. (30 September 2022). "The chemical signature of the Galactic spiral arms revealed by Gaia DR3". Astronomy & Astrophysics 666: L4. doi:10.1051/0004-6361/202244361. ISSN 0004-6361. Bibcode: 2022A&A...666L...4P. 
  11. ↑ 11.0 11.1 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". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HD 168592". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+168592. 
  13. ↑ 13.0 13.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  15. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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