Delta Octantis
  | |
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Octans |
| Right ascension | 14h26m55.23244s[1] |
| Declination | −83° 40′ 04.3868″[1] |
| Apparent magnitude(V) | 4.31[2] |
| Characteristics | |
| Spectral type | K2III[3] |
| U−Bcolor index | +1.45[4] |
| B−Vcolor index | +1.31[4] |
| Astrometry | |
| Radial velocity(Rv) | +4.60[5]km/s |
| Proper motion(μ) | RA:-96.12[1]mas/yr Dec.:-13.27[1]mas/yr |
| Parallax(π) | 10.91 ± 0.14mas[1] |
| Distance | 299 ± 4ly (92 ± 1pc) |
| Absolute magnitude(MV) | −0.35 ± 0.09[6] |
| Details | |
| Mass | 1.06[5]M☉ |
| Radius | 24.61[5]R☉ |
| Luminosity | 271[2]L☉ |
| Surface gravity(logg) | 1.89[5]cgs |
| Temperature | 4,311[5]K |
| Metallicity[Fe/H] | -0.42[5]dex |
| Rotational velocity(vsini) | 1.1[7]km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
δ Octantis,Latinised asDelta Octantis,has the distinction of beingSaturn's southernpole star.[8]An orange giant of class K2III,[3]it has 1.2 times the mass of the Sun and about 25 times the Sun's radius. This star is about 4.3 billion years old, which is similar to the age of the Sun.[6]
Naming[edit]
InChinesecaused by adaptation of the European southern hemisphere constellations into the Chinese system,Dị tước(Yì Què), meaningExotic Bird,refers to an asterism consisting of δ Octantis,ζ Apodis,ι Apodis,β Apodis,γ Apodis,δ1Apodis,η Apodis,α Apodisandε Apodis.Consequently, δ Octantis itself is known asDị tước năm(Yì Què wǔ,English:the Fifth Star of Exotic Bird).[9]
References[edit]
- ^abcdeVan Leeuwen, F. (2007). "Validation of the new Hipparcos reduction".Astronomy and Astrophysics.474(2): 653–664.arXiv:0708.1752.Bibcode:2007A&A...474..653V.doi:10.1051/0004-6361:20078357.S2CID18759600.Vizier catalog entry
- ^abAnderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.S2CID119257644.Vizier catalog entry
- ^abHoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)".VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H.5050.Bibcode:1995yCat.5050....0H.
- ^abMallama, A. (2014). "Sloan Magnitudes for the Brightest Stars".The Journal of the American Association of Variable Star Observers.42(2): 443.Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^abcdefJofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets".Astronomy & Astrophysics.574:A50.arXiv:1410.6422.Bibcode:2015A&A...574A..50J.doi:10.1051/0004-6361/201424474.S2CID53666931.Vizier catalog entry
- ^abda Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars",Astronomy and Astrophysics,458(2): 609–623,arXiv:astro-ph/0608160,Bibcode:2006A&A...458..609D,doi:10.1051/0004-6361:20065105,S2CID9341088
- ^De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (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.S2CID54046583.Vizier catalog entry
- ^"Octans".UK Astronomy Society. Archived fromthe originalon 1 August 2020.Retrieved10 October2011.
- ^(in Chinese)AEEA (Activities of Exhibition and Education in Astronomy) thiên văn giáo dục tin tức võng 2006 năm 7 nguyệt 29 ngày
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