HD 222060
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 23h 38m 23.88625s[1]
Declination −76° 52′ 10.3567″[1]
Apparent magnitude (V) 5.98±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K0 II/III[4]
U−B color index +0.65[5]
B−V color index +0.90[5]
Astrometry
Radial velocity (Rv)2.3±0.5[6] km/s
Proper motion (μ) RA: +83.519 mas/yr[1]
Dec.: −25.064 mas/yr[1]
Parallax (π)6.0864 ± 0.0294 mas[1]
Distance536 ± 3 ly
(164.3 ± 0.8 pc)
Absolute magnitude (MV)−0.05[7]
Details[8]
Mass3.20±0.10 M☉
Radius12.6±0.2 R☉
Luminosity102±3 L☉
Surface gravity (log g)2.85±0.06 cgs
Temperature5,175±30 K
Metallicity [Fe/H]+0.05±0.03 dex
Rotational velocity (v sin i)3.7±1[9] km/s
Age318+30
−40[1] Myr
Other designations
84 G. Octantis[10], CPD−77°1583, GC 32840, HD 222060, HIP 116653, HR 8957, SAO 258166[11]
Database references
SIMBADdata

HD 222060, also known as HR 8957, is a solitary, orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from GAIA, the object is estimated to be 536 light years distant.[1] It appears to be slowly receding from the Solar System, having a heliocentric radial velocity of 2.3 km/s.[9]

This is an evolved giant star that is currently on the red giant branch,[3] fusing a hydrogen shell around a helium core. HD 222060 a stellar classification of K0 II/III,[4] a K-type star with the blended luminosity class of a giant and a bright giant. It has 3.2 times the mass of the Sun[8] and is currently 318 million years old.[9] Due to its high mass, the object has expanded to an enlarged radius of 12.6 R☉.[8] It radiates 102 times the luminosity of the Sun from its photosphere at an effective temperature of 5,175 K.[8] HD 222060 has a near solar metallicity[8] and spins modestly with a projected rotational velocity of 3.7 km/s.[9]

References

  1. 1 2 3 4 5 6 7 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.
  3. 1 2 Cardiel, Nicolás; Zamorano, Jaime; Carrasco, Josep Manel; Masana, Eduard; Bará, Salvador; González, Rafael; Izquierdo, Jaime; Pascual, Sergio; Sánchez de Miguel, Alejandro (23 July 2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society. 507 (1): 318–329. arXiv:2107.08734. Bibcode:2021MNRAS.507..318C. doi:10.1093/mnras/stab2124. eISSN 1365-2966. ISSN 0035-8711.
  4. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
  5. 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.
  6. ↑ 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.
  7. ↑ 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.
  8. 1 2 3 4 5 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. eISSN 1432-0746. ISSN 0004-6361.
  9. 1 2 3 4 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. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
  10. ↑ 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.
  11. ↑ "HD 167714". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 7, 2022.
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