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Kappa2 Apodis
Double star in the constellation Apus From Wikipedia, the free encyclopedia
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Kappa2 Apodis is a double star in the southern circumpolar constellation of Apus. Its identifier is a Bayer designation that is Latinized from κ2 Apodis, and abbreviated Kap2 Aps or κ2 Aps, respectively. This star is located at a distance of approximately 720 light-years (220 parsecs) from Earth, based upon parallax measurements with a 1.4% margin of error.[2] They are approaching the Sun with a radial velocity of −19 km/s.[5] The pair have a combined apparent visual magnitude of +5.65,[3] which makes the system faintly visible to the naked eye.
The brighter star, designated κ2 Aps A, has a stellar classification of B7 III-IV, with the luminosity class of III-IV suggesting that it may lie in an intermediate stage between a subgiant and a giant star.[10] Based on observations with TESS, it is a pulsating B star of the Maia type.[11] This star is about 130[8] million years old with an estimated 5 times the mass and 5.6 times the radius of the Sun.[7] It is radiating 316[8] times the luminosity of the Sun from its photosphere at an effective temperature of 12,646 K.[8]
A faint companion, κ2 Aps C,[8] is a K-type main sequence star with a classification of K0 V. It has a visual magnitude of 12.5 and an angular separation of 15 arcseconds from the brighter member.[4] The pair have a projected separation of around 2,520 au.[6]
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