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Kappa Octantis

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Am star in the constellation Octans

κ Octantis
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Octans
Right ascension	13^h 40^m 55.4833^s^[1]
Declination	−85° 47′ 09.752″^[1]
Apparent magnitude (V)	5.55±0.01^[2]
Characteristics
Spectral type	A2 mA5-A8^[3]
U−Bcolor index	+0.16^[4]
B−Vcolor index	+0.18^[4]
Astrometry

Radial velocity (R_v)	−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]
Distance	285 ± 2 ly (87.4 ± 0.6 pc)
Absolute magnitude (M_V)	+0.95^[6]

Details

Mass	2.07±0.18^[7] `M`_☉
Radius	2.75^+0.13 _−0.12^[7] `R`_☉
Luminosity	34.83^[6] `L`_☉
Surface gravity (log g)	3.9±0.1^[7] cgs
Temperature	7,943⁺¹⁸⁵ ₋₁₈₁^[7] K
Age	354^[8] Myr

Other designations
κ Oct,18 G. Octantis,CPD−85°384,GC 18357,HD 117374,HIP 66753,HR 5084,SAO 258674
Database references
SIMBAD	data

Kappa Octantis,Latinized fromκ Octantis, is a solitary^[9]star in the southerncircumpolar constellation Octans. It has anapparent magnitude of 5.55,^[2] making it visible to thenaked eye under ideal conditions. The object is located at a distance of 285light years but is approaching theSolar System with a heliocentricradial velocity of−9 km/s.^[5]

Kappa Octanits is anAm star, making it difficult to classify. It has been given astellar classification of A2 mA5-A8,^[3] indicating that it is an A2 star with themetallic lines of an A5-A8 star. At present it has 2.07 times themass of the Sun and 2.75 its radius.^[7] It shines at aluminosity of about35 L_☉^[6] from itsphotosphere at aneffective temperature of 7,943K,^[7] giving it a white glow. Kappa Octantis is said to be around 350million years old.^[8]

References

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^^a ^b ^c ^dBrown, 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 atVizieR.
^^a ^bHøg, 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.
^^a ^bHouk, 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.
^^a ^bJohnson, 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.
^^a ^bKharchenko, 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.
^^a ^b ^cAnderson, 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.S2CID 255204555.
^^a ^b ^c ^d ^e ^fAllende 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.
^^a ^bGontcharov, 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.S2CID 255202762.
^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.

Constellation of Octans

Stars

Bayer	α β γ¹ γ² γ³ δ ε ζ η θ ι κ λ μ¹ μ² ν ξ ο π¹ π² ρ σ (Polaris Australis) τ υ φ χ ψ ω
Variable	R BQ CK CW FT
HR	47 512 525 4595 6837 6912 7698 7785 7812 8234 8380 8432 8526 8577 8786 8935 8957 8995
HD	142022 166066 212301
Other	Gliese 877 LHS 475 TOI-4342 W2150AB

Exoplanets	2MASS J2126–8140 HD 142022 Ab HD 212301 b LHS 475 b

Galaxies

NGC	2573 7095 7098
Other	PGC 10922