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Kappa Octantis, Latinized from κ Octantis, is a solitary[9] star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.55,[2] making it visible to the naked eye under ideal conditions. The object is located at a distance of 285 light years but is approaching the Solar System with a heliocentric radial velocity of −9 km/s.[5]

κ Octantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 13h 40m 55.4833s[1]
Declination −85° 47′ 09.752″[1]
Apparent magnitude (V) 5.55±0.01[2]
Characteristics
Spectral type A2 mA5-A8[3]
U−B color index +0.16[4]
B−V color index +0.18[4]
Astrometry
Radial velocity (Rv)−9.0±7.4[5] km/s
Proper motion (μ) RA: −88.395 mas/yr[1]
Dec.: −23.285 mas/yr[1]
Parallax (π)11.4403 ± 0.0849 mas[1]
Distance285 ± 2 ly
(87.4 ± 0.6 pc)
Absolute magnitude (MV)+0.95[6]
Details
Mass2.07±0.18[7] M☉
Radius2.75+0.13
−0.12[7] R☉
Luminosity34.83[6] L☉
Surface gravity (log g)3.9±0.1[7] cgs
Temperature7,943+185
−181[7] K
Age354[8] Myr
Other designations
κ Oct, 18 G. Octantis, CPD−85°384, GC 18357, HD 117374, HIP 66753, HR 5084, SAO 258674
Database references
SIMBADdata

Kappa Octanits is an Am star, making it difficult to classify. It has been given a stellar classification of A2 mA5-A8,[3] indicating that it is an A2 star with the metallic lines of an A5-A8 star. At present it has 2.07 times the mass of the Sun and 2.75 its radius.[7] It shines at a luminosity of about 35 L☉[6] from its photosphere at an effective temperature of 7,943 K,[7] giving it a white glow. Kappa Octantis is said to be around 350 million years old.[8]


Reference


  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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. 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_ƒ0. Bibcode:1975mcts.book.....H.
  4. 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. Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.
  6. 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. ISSN 1063-7737.
  7. Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361.
  8. Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv:1606.09028. Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN 1562-6873. ISSN 1063-7737.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.


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