Kappa Octantis

κ Octantis
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Octans
Right ascension	13h 40m 55.4833s
Declination	−85° 47′ 09.752″
Apparent magnitude (V)	5.55±0.01
Characteristics
Spectral type	A2 mA5-A8
U−B color index	+0.16
B−V color index	+0.18
Astrometry
Radial velocity (Rv)	−9.0±7.4 km/s
Proper motion (μ)	RA: −88.395 mas/yr ; Dec.: −23.285 mas/yr
Parallax (π)	11.4403±0.0849 mas
Distance	285 ± 2 ly ; (87.4 ± 0.6 pc)
Absolute magnitude (MV)	+0.95
Details
Mass	2.07±0.18 M☉
Radius	2.75+0.13; −0.12 R☉
Luminosity	34.83 L☉
Surface gravity (log g)	3.9±0.1 cgs
Temperature	7,943+185; −181 K
Age	354 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 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]

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]

References

^ ^a ^b ^c ^d 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b ^c 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. S2CID 255204555.
^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b 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. 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.

[EDR3-1] 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.

[Tycho2000-2] 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.

[Houk1975-3] 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.

[Johnson1966-4] 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.

[Karchenko2007-5] 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.

[Anderson2012-6] 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. S2CID 255204555.

[A.P1999-7] ^ ^a ^b ^c ^d ^e ^f 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.

[Gontcharov2012-8] 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. S2CID 255202762.

[Eggelton2008-9] 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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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−B color index	+0.16^[4]
B−V color 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

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