HD 199223
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| A | |
| Right ascension | 20h 55m 40.6778s |
| Declination | +04° 31′ 57.799″ |
| Apparent magnitude (V) | 6.34±0.01 |
| B | |
| Right ascension | 20h 55m 40.5439s |
| Declination | +04° 31′ 58.227″ |
| Apparent magnitude (V) | 7.49±0.01 |
| Characteristics | |
| A | |
| Evolutionary stage | red giant branch |
| Spectral type | G8 III/IV |
| U−B color index | +0.49 |
| B−V color index | +0.82 |
| B | |
| Spectral type | F/G |
| Astrometry | |
| Radial velocity (Rv) | −32.6±0.4 km/s |
| Absolute magnitude (MV) | +0.33 |
| A | |
| Proper motion (μ) | RA: +60.413 mas/yr Dec.: +10.949 mas/yr |
| Parallax (π) | 9.2067±0.0354 mas |
| Distance | 354 ± 1 ly (108.6 ± 0.4 pc) |
| B | |
| Proper motion (μ) | RA: +60.315 mas/yr Dec.: +9.758 mas/yr |
| Parallax (π) | 9.0757±0.0758 mas |
| Distance | 359 ± 3 ly (110.2 ± 0.9 pc) |
| Details | |
| A | |
| Mass | 1.63 M☉ |
| Radius | 7.71 R☉ |
| Luminosity | 36.5 L☉ |
| Surface gravity (log g) | 2.75 cgs |
| Temperature | 4,830 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotational velocity (v sin i) | <1 km/s |
| Age | 557 Myr |
| B | |
| Mass | 1.36 M☉ |
| Radius | 2.32 R☉ |
| Luminosity | 9.04 L☉ |
| Surface gravity (log g) | 3.84 cgs |
| Temperature | 6,572 K |
| Metallicity [Fe/H] | −0.2 dex |
| Other designations | |
| 1 G. Equulei, AG+04°2834, BD+03°4461, GC 29200, HD 199223, HIP 103301, HR 8010, SAO 126373, WDS J20557+0432 | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
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. 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.