Astronomy:HD 222060
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas/yr Dec.: −25.064[1] mas/yr |
| Parallax (π) | 6.0864 ± 0.0294[1] mas |
| Distance | 536 ± 3 ly (164.3 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.05[7] |
| Details[8] | |
| Mass | 3.20±0.10 M☉ |
| Radius | 12.6±0.2 R☉ |
| Luminosity | 102±3 L☉ |
| Surface gravity (log g) | 2.85±0.06 cgs |
| Temperature | 5,175±30 K |
| Metallicity [Fe/H] | +0.05±0.03 dex |
| Rotational velocity (v sin i) | 3.7±1[9] km/s |
| Age | 318+30−40[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 Cardiel, Nicolás; Zamorano, Jaime; Carrasco, Josep Manel; Masana, Eduard; Bará, Salvador; González, Rafael; Izquierdo, Jaime; Pascual, Sergio et al. (23 July 2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society 507 (1): 318–329. doi:10.1093/mnras/stab2124. ISSN 0035-8711. Bibcode: 2021MNRAS.507..318C.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 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.
- ↑ 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.
- ↑ 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.
- ↑ 8.0 8.1 8.2 8.3 8.4 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (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. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O.
- ↑ 9.0 9.1 9.2 9.3 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.
- ↑ "HD 167714". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+167714.
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