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Kappa1 Coronae Australis

For other star systems with this Bayer designation see κ Coronae Australis
κ1 Coronae Australis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 33m 23.0809s[1]
Declination −38° 43′ 12.166″[1]
Apparent magnitude (V) 6.17±0.01[2]
Characteristics
Spectral type A0 IV[3]
B−V color index −0.06[4]
Astrometry
Radial velocity (Rv)−16±3.7[5] km/s
Proper motion (μ) RA: −0.512 mas/yr[1]
Dec.: −22.550 mas/yr[1]
Parallax (π)4.4833 ± 0.0831 mas[1]
Distance730 ± 10 ly
(223 ± 4 pc)
Absolute magnitude (MV)−0.78
Details[6]
Mass2.82±0.38 M☉
Radius3.79±0.15 R☉
Luminosity179±14 L☉
Surface gravity (log g)3.73±0.07 cgs
Temperature11,079[7] K
Metallicity [Fe/H]−0.2[8] dex
Rotational velocity (v sin i)339[9] km/s
Age4.1±1.8[10] Myr
Other designations
κ1 CrA, 16 G. Coronae Australis[11], CD−38°12896, CPD−38°7538, GC 25315, HD 170868, HIP 90969, HR 6952, SAO 210293, 210296, WDS J18334-3844B[12]
Database references
SIMBADdata

Kappa1 Coronae Australis (Kappa1 CrA), Latinized from κ1 Coronae Australis, is a star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility.

There has been some disagreement about the object's distance. The New Hipparcos Reduction calculates a parallax of 21.18±6.53 mas,[13] yielding a distance of 154±47 light years, somewhat poorly constrained. New analysis from the Gaia spacecraft find that it has a physical relation to κ2 Coronae Australis.[14] Both of their currently parallaxes place them around 700 light years away.[1] As of 2018, the two stars have an angular separation of 20.5″ along a position angle of 359°.[15]

Kappa1 CrA has a stellar classification of A0 IV,[3] indicating that it is a slightly evolved A-type star. At present it has 2.8 times the mass of the Sun and a slightly enlarged radius of 3.79 R☉.[6] It radiates at 179 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 11,079 K.[7] Kappa1 CrA's metallicity – specifically the iron abundance – is 63% that of the Sun.[8] With an age of about four million years, Kappa1 CrA is modelled to be a young star only about 10% of the way through its main sequence life.[9]

  1. ^ a b c d e Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Pickles2010 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Corben1971 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Karchenko2007 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference tetzlaff2011 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference valeri2020 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).

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