22h52m09.862s, +35° 26′ 49.59″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h52m 09.8636s[1] |
| Declination | +35° 26′ 49.608″[1] |
| Apparent magnitude (V) | 10.17[2] |
| Characteristics | |
| Spectral type | F[3] |
| Apparent magnitude (B) | 10.77 ± 0.04[2] |
| Apparent magnitude (V) | 10.36 ± 0.03[2] |
| Apparent magnitude (J) | 9.214 ± 0.022[2] |
| Apparent magnitude (H) | 9.004 ± 0.018[2] |
| Apparent magnitude (K) | 8.953 ± 0.013[2] |
| Variable type | planetary transit[3] |
| Astrometry | |
| Radial velocity (Rv) | −22.2±0.3[1] km/s |
| Proper motion (μ) | RA: 74.676(19) mas/yr[1] Dec.: 14.944(20) mas/yr[1] |
| Parallax (π) | 4.6606 ± 0.0208 mas[1] |
| Distance | 700 ± 3 ly (214.6 ± 1.0 pc) |
| Details | |
| Mass | 1.27±0.03[4] M☉ |
| Radius | 1.491+0.016 −0.014[4] R☉ |
| Surface gravity (log g) | 4.1956+0.0095 −0.013[4] cgs |
| Temperature | 6410±140[4] K |
| Metallicity [Fe/H] | -0.018+0.0072 −0.056[4] dex |
| Rotational velocity (v sin i) | 12.6 ± 1.0[5] km/s |
| Age | 3.4 ± 1 Gyr |
| Other designations | |
Gaia DR3 1891507552826485632, TYC 2757-1152-1, GSC 02757-01152, 2MASS J22520985+3526495[2] | |
| Database references | |
| SIMBAD | data |
HAT-P-8 is a magnitude10star located 700 light-years away in Pegasus.[2] It is a F-type star about 28% more massive than the Sun.[3] Two red dwarf companions have been detected around HAT-P-8. The first has a spectral type of M5V and has a mass of 0.22 M☉. The second is even less massive, at 0.18 M☉, and its spectral type is M6V.[6]
In 2008 the HATNet Project announced the discovery of extrasolar planet HAT-P-8b around this star. This planet is a hot Jupiter gas giant planet.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.354±0.035 MJ | 0.04496+0.00046 −0.00045 |
3.0763458±0.0000024 | <0.0060 | — | 1.334±0.013[4] RJ |
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