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HD 199223
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HD 199223
HD 199223 (HR 8010) is a double star in the equatorial constellation Delphinus. However, the system was originally in Equuleus prior to the creation of official IAU constellation borders. The components have a separation of 2″ at a position angle of 282° as of 2016. They have apparent magnitudes of 6.34 and 7.49 and distances of 354 and 359 light years respectively. The system is drifting closer with a radial velocity of −33 km/s.
The brighter component has a stellar classification of G8 III/IV, indicating that it is a G-type star with the blended luminosity class of a giant star and a subgiant. It has 163% of the mass of the Sun and an enlarged radius of 7.71 R☉. It shines at 36.5 times the luminosity of the Sun from its photosphere at an effective temperature of 4,830 K, giving it a yellow glow. HD 199223A's iron abundance is 135% that of the Sun and it spins modestly with a projected rotational velocity less than 1 km/s.
As for the dimmer one, it is classified as an F/G star, and is calculated to be an F-type subgiant.[citation needed] It has 136% of the mass of the Sun and 2.3 times its radius. It radiates with a luminosity of 9.04 L☉ from its photosphere at an effective temperature of 6,572 K, giving it a yellow white glow.
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HD 199223
HD 199223 (HR 8010) is a double star in the equatorial constellation Delphinus. However, the system was originally in Equuleus prior to the creation of official IAU constellation borders. The components have a separation of 2″ at a position angle of 282° as of 2016. They have apparent magnitudes of 6.34 and 7.49 and distances of 354 and 359 light years respectively. The system is drifting closer with a radial velocity of −33 km/s.
The brighter component has a stellar classification of G8 III/IV, indicating that it is a G-type star with the blended luminosity class of a giant star and a subgiant. It has 163% of the mass of the Sun and an enlarged radius of 7.71 R☉. It shines at 36.5 times the luminosity of the Sun from its photosphere at an effective temperature of 4,830 K, giving it a yellow glow. HD 199223A's iron abundance is 135% that of the Sun and it spins modestly with a projected rotational velocity less than 1 km/s.
As for the dimmer one, it is classified as an F/G star, and is calculated to be an F-type subgiant.[citation needed] It has 136% of the mass of the Sun and 2.3 times its radius. It radiates with a luminosity of 9.04 L☉ from its photosphere at an effective temperature of 6,572 K, giving it a yellow white glow.
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