Astronomy:K Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 29m 25.25471s[1] |
| Declination | −51° 09′ 54.5048″[1] |
| Apparent magnitude (V) | +5.04[2] |
| Characteristics | |
| Spectral type | A1V[3] |
| U−B color index | +0.07 |
| B−V color index | +0.059±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −2.0±4.2[2] km/s |
| Proper motion (μ) | RA: -2.094[1] mas/yr Dec.: -5.548[1] mas/yr |
| Parallax (π) | 7.9861 ± 0.2224[1] mas |
| Distance | 410 ± 10 ly (125 ± 3 pc) |
| Absolute magnitude (MV) | −0.91[2] |
| Details | |
| Mass | 3.128[4] M☉ |
| Radius | 6.635[5] R☉ |
| Luminosity | 248[5] L☉ |
| Surface gravity (log g) | 2.982[5] cgs |
| Temperature | 9,167[5] K |
| Rotational velocity (v sin i) | 220.4±2.4[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
K Centauri is a possible binary star in the southern constellation of Centaurus. It has a white hue and is bright enough to be visible to the naked eye, having an apparent visual magnitude of +5.04.
K Centauri is located at a distance of approximately 410 light years from the Sun based on parallax, and it has an absolute magnitude of −0.91.[2] This is an ordinary A-type main-sequence star with a stellar classification of A1V.[3] It is spinning rapidly with a projected rotational velocity of 220 km/s,[6] which is giving it a pronounced equatorial bulge that is 25% larger than the polar radius.[8]
Analysis of Hipparcos and Gaia astrometry suggests that the relatively large margins of error in the calculated parallax may be due to orbital motion caused by an unseen companion. The companion would be an 81 |♃|J}}}}}} object orbiting at about 2 astronomical unit|AU.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (2019), "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly", Astronomy and Astrophysics 623: A72, doi:10.1051/0004-6361/201834371, Bibcode: 2019A&A...623A..72K.
- ↑ 5.0 5.1 5.2 5.3 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society 471 (1): 770, doi:10.1093/mnras/stx1433, Bibcode: 2017MNRAS.471..770M.
- ↑ 6.0 6.1 Díaz, C. G. et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics 531: A143, doi:10.1051/0004-6361/201016386, Bibcode: 2011A&A...531A.143D.
- ↑ "K Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K+Cen.
- ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
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