HD 220773
HD 220773 is a star with an orbiting exoplanet in the northern constellation of Pegasus. It has an apparent visual magnitude of 7.10, which is too faint to be visible with the naked eye. The distance to this system, as determined by parallax measurements, is 165 light years, but it is drifting closer with a radial velocity of −37.7 km/s. The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.187 arcsec yr−1.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 26m 27.445s |
| Declination | +08° 38′ 37.84″ |
| Apparent magnitude (V) | 7.10 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G0 V or F9 V |
| B−V color index | 0.602±0.005 |
| Astrometry | |
| Radial velocity (Rv) | −37.735±0.0009 km/s |
| Proper motion (μ) | RA: 27.096 mas/yr Dec.: −222.458 mas/yr |
| Parallax (π) | 19.7694 ± 0.0669 mas |
| Distance | 165.0 ± 0.6 ly (50.6 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.57 |
| Details | |
| Mass | 1.154±0.003 M☉ |
| Radius | 1.73±0.02 R☉ |
| Luminosity | 3.16±0.01 L☉ |
| Surface gravity (log g) | 4.02±0.01 cgs |
| Temperature | 5,852±26 K |
| Metallicity [Fe/H] | 0.09±0.06 dex |
| Rotational velocity (v sin i) | 3.82±1.00 km/s |
| Age | 6.3±0.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of HD 220773 presents as a late type star F-type or early G-type main-sequence star with a stellar classification of F9 V or G0 V, respectively. It is older than the Sun, with an estimated age of 6.3 billion years, and the magnetic activity in the chromosphere is at a low level. The star has 15% greater mass than the Sun but the radius is 73% larger. The abundance of iron, a measure of the star's metallicity, is slightly higher than solar. It is radiating over three times the luminosity of the Sun from its photosphere at an effective temperature of 5,852 K.
A survey in 2015 ruled out the existence of any additional stellar companions at projected distances from 31 to 337 astronomical units.