- Source: Kappa1 Coronae Australis
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, 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. Both of their currently parallaxes place them around 700 light years away. As of 2018, the two stars have an angular separation of 20.5″ along a position angle of 359°.
Kappa1 CrA has a stellar classification of A0 IV, 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☉. It radiates at 179 times the luminosity of the Sun from its photosphere at an effective temperature of 11,079 K. Kappa1 CrA's metallicity – specifically the iron abundance – is 63% that of the Sun. 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.
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