HD 162337

HD 162337
Location of HD 162337 on the map (circled)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Apus
Right ascension 18h 05m 26.85525s
Declination −81° 29′ 11.6368″
Apparent magnitude (V) 6.35±0.01
Characteristics
Spectral type K3/4 III
U−B color index +1.75
B−V color index +1.50
Astrometry
Radial velocity (Rv)−3.3±0.4 km/s
Proper motion (μ) RA: +28.344 mas/yr
Dec.: −48.347 mas/yr
Parallax (π)3.2987±0.0286 mas
Distance989 ± 9 ly
(303 ± 3 pc)
Absolute magnitude (MV)−0.61
Details
Radius42.0+4.2
−4.1 or 67.8±1.6 R☉
Luminosity495±13 or 1,055+28
−27 L☉
Surface gravity (log g)0.71±0.01 cgs
Temperature4,186±122 K
Metallicity [Fe/H]−0.66 dex
Rotational velocity (v sin i)<1.0 km/s
Other designations
65 G. Apodis, CD−81°673, CPD−81°799, FK5 3990, GC 24431, HD 162337, HIP 88599, HR 6646, SAO 258787
Database references
SIMBADdata

HD 162337, also known as HR 6646 or rarely 65 G. Apodis, is a solitary orange-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.35, placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 989 light-years based on Gaia DR3 parallax measurements, but it is drifting closer with a heliocentric radial velocity of −3.3 km/s. At its current distance, HD 162337's brightness is heavily diminished by 0.45 magnitudes due to interstellar extinction and it has an absolute magnitude of −0.61.

HD 162337 has a stellar classification of K3/4 III, indicating that it is an evolved star with the characteristics of a K3 and K4 giant star. It has expanded to 42 times the radius of the Sun and now radiates 495 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,186 K. However, Gaia DR3 stellar evolution models give a larger radius of 67.8±1.6 R☉ and a higher luminosity of 1,055+28
−27 L☉. HD 162337 is metal deficient with an iron abundance 21.9% that of the Sun's ([Fe/H] = −0.66) and it spins too slowly for its projected rotational velocity to measured accurately.

References

  1. 1 2 3 4 5 6 7 8 9 10 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. 1 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. S2CID 17128864.
  3. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
  4. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. 1 2 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  6. 1 2 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  7. 1 2 3 4 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.
  8. 1 2 3 Poggio, E.; Recio-Blanco, A.; Palicio, P. A.; Re Fiorentin, P.; de Laverny, P.; Drimmel, R.; Kordopatis, G.; Lattanzi, M. G.; Schultheis, M.; Spagna, A.; Spitoni, E. (30 September 2022). "The chemical signature of the Galactic spiral arms revealed by Gaia DR3". Astronomy & Astrophysics. 666: L4. arXiv:2206.14849. Bibcode:2022A&A...666L...4P. doi:10.1051/0004-6361/202244361. eISSN 1432-0746. ISSN 0004-6361.
  9. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  10. 1 2 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. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.
  11. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  12. ↑ "HD 128294". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 20, 2015.
  13. ↑ 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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.