HD 221525
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HD 221525 is a single[1] star near the north celestial pole[2] in the constellation Cepheus. At an apparent magnitude of 5.56,[3] it can be seen with the naked eye under dark skies. It is about 30 times fainter than the nearby prominent star Polaris.[4] Based upon parallax measurements, HD 221525 is located at a distance of approximately 317 light years from the Sun,[5] but is drifting closer with a radial velocity of −11 km/s.[3]
This object is an A-type star with a stellar classification of A7IV[6] or A8III,[7] suggesting it is an evolving star on the subgiant or giant branch, respectively. It has a relatively high rate of spin, showing a projected rotational velocity of 110 km/s.[6] The star has four[5] times the radius of the Sun and is radiating 44[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,466 K.[5]
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