Astronomy:Kappa Octantis
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas/yr Dec.: −23.285[1] mas/yr |
| Parallax (π) | 11.4403 ± 0.0849[1] mas |
| Distance | 285 ± 2 ly (87.4 ± 0.6 pc) |
| Absolute magnitude (MV) | +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 | |
| 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 solar luminosity[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
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 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. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K.
- ↑ 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 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. ISSN 0004-6361. Bibcode: 1999A&A...352..555A.
- ↑ 8.0 8.1 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters 38 (11): 694–706. doi:10.1134/S1063773712110035. ISSN 1063-7737. Bibcode: 2012AstL...38..694G.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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