Delta Octantis

δ Octantis
Location of δ Octantis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 14h 26m 55.23244s[1]
Declination −83° 40′ 04.3868″[1]
Apparent magnitude (V) 4.31[2]
Characteristics
Spectral type K2III[3]
U−B color index +1.45[4]
B−V color 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 ± 0.14 mas[1]
Distance299 ± 4 ly
(92 ± 1 pc)
Absolute magnitude (MV)−0.35 ± 0.09[6]
Details
Mass1.06[5] M☉
Radius24.61[5] R☉
Luminosity271[2] L☉
Surface gravity (log g)1.89[5] cgs
Temperature4,311[5] K
Metallicity [Fe/H]-0.42[5] dex
Rotational velocity (v sin i)1.1[7] km/s
Other designations
CD-83 189, GC 19349, HIP 70638, HR 5339, HD 124882, NSV 6636, SAO 258698
Database references
SIMBADdata

δ Octantis, Latinised as Delta Octantis, has the distinction of being Saturn's southern pole 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]

  1. ^ a b c d e Van 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. S2CID 18759600. Vizier catalog entry
  2. ^ a b Anderson, 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. S2CID 119257644. Vizier catalog entry
  3. ^ a b Hoffleit, 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.
  4. ^ a b Mallama, 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
  5. ^ a b c d e f Jofré, 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. S2CID 53666931. Vizier catalog entry
  6. ^ a b Cite error: The named reference aaa458_2_609 was invoked but never defined (see the help page).
  7. ^ 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. S2CID 54046583. Vizier catalog entry
  8. ^ "Octans". UK Astronomy Society. Archived from the original on 1 August 2020. Retrieved 10 October 2011.