Kappa1 Coronae Australis

{{hatnote|For other star systems with this Bayer designation see κ Coronae Australis}}

{{Starbox begin

| name = κ¹ Coronae Australis

}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Corona Australis

| ra = {{RA|18|33|23.0809}}

| dec = {{DEC|-38|43|12.166}}

| appmag_v = 6.17{{±|0.01}}

}}

{{Starbox character

| class = A0 IV

| b-v = −0.06

}}

{{Starbox astrometry

| radial_v = −16{{±|3.7}}

| parallax = 4.4833

| p_error = 0.0831

| parallax_footnote =

| prop_mo_ra = −0.512

| prop_mo_dec = −22.550

| pm_footnote =

| absmag_v = −0.78

}}

{{Starbox detail

| source =

| mass = 2.82{{±|0.38}}

| radius = 3.79{{±|0.15}}

| luminosity = 179{{±|14}}

| gravity = 3.73{{±|0.07}}

| temperature = 11,079

| metal_fe = −0.2

| rotational_velocity = 339

| age_myr = 4.1{{±|1.8}}

}}

{{Starbox catalog

| names = {{odlist|HD = 170868|CD = −38°12896|CPD = −38°7538|GC = 25315|HIP = 90969|HR = 6952|SAO = 210293, 210296|WDS = J18334-3844B|Gould = 16 G. Coronae Australis|B = κ¹ CrA}}

}}

{{Starbox reference

| Simbad = Kap01+CrA

}}

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 {{val|21.18|6.53|ul=mas}}, yielding a distance of {{val|154|47|ul=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 {{val|20.5|ul=arcsecond}} along a position angle of {{val|359|ul=°}}.

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 {{solar radius|3.79|link=y}}. It radiates at 179 times the luminosity of the Sun from its photosphere at an effective temperature of {{val|11079|fmt=commas|ul=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.

References

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}}

External links

[http://server7.wikisky.org/starview?object_type=1&object_id=7355 Server7.wikisky.org]

Category:Corona Australis

Corona Australis, Kappa1

Category:A-type subgiants

Coronae Australis, 16