Kappa Arae
Appearance
Observation data EpochJ2000EquinoxJ2000 | |
---|---|
Constellation | Ara |
Right ascension | 17h26m00.04169s[1] |
Declination | –50° 38′ 00.6417″[1] |
Apparent magnitude(V) | 5.21[2] |
Characteristics | |
Spectral type | G8 III[3] |
B−Vcolor index | +1.05[2] |
Astrometry | |
Radial velocity(Rv) | +17.3[4]km/s |
Proper motion(μ) | RA:+13.45[1]mas/yr Dec.:+8.36[1]mas/yr |
Parallax(π) | 7.16 ± 0.40mas[1] |
Distance | 460 ± 30ly (140 ± 8pc) |
Absolute magnitude(MV) | –0.58[5] |
Details | |
Radius | 14[6]R☉ |
Surface gravity(logg) | 2.3[5]cgs |
Temperature | 4,950[5]K |
Metallicity[Fe/H] | –0.3[5]dex |
Other designations | |
Database references | |
SIMBAD | data |
Kappa Arae(κ Ara, κ Arae) is theBayer designationfor a single[8]starin the southernconstellationofAra.Based uponparallaxmeasurements, it is approximately 460light-years(140parsecs) distant from Earth, give or take a 30 light-yearmargin of error.[1]With anapparent visual magnitudeof 5.21,[2]this star is faintly visible to the naked eye.
This is agiant starwith astellar classificationof G8 III;[3]itsouter envelopehas expanded to about 14 times the radius of the Sun.[6]It is radiating energy into space at aneffective temperatureof 4,950 K.[5]This is hot enough for it to shine with the golden-hued glow of aG-type star.[9]
It has two 14th magnitudeoptical companionsthat are at anangular distanceof 25 and 30arcseconds.[citation needed]
References
[edit]- ^abcdefvan Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474(2): 653–664,arXiv:0708.1752,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID18759600.
- ^abcCorben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars",Monthly Notes of the Astronomical Society of Southern Africa,27:11,Bibcode:1968MNSSA..27...11C.
- ^abHouk, Nancy (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1978mcts.book.....H.
- ^Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.).Determination of Radial Velocities and their Applications.IAU Symposium no. 30. Vol. 30. University of Toronto:International Astronomical Union.p. 57.Bibcode:1967IAUS...30...57E.
- ^abcdeJasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances",Astronomy and Astrophysics,342:831–838,Bibcode:1999A&A...342..831J
- ^abPasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics",Astronomy and Astrophysics,367(2): 521–524,arXiv:astro-ph/0012289,Bibcode:2001A&A...367..521P,doi:10.1051/0004-6361:20000451,S2CID425754.
- ^"kap Ara".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2010-07-30.
- ^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.S2CID14878976.
- ^"The Colour of Stars",Australia Telescope, Outreach and Education,Commonwealth Scientific and Industrial Research Organisation,December 21, 2004, archived fromthe originalon February 22, 2012,retrieved2012-01-16.