HAT-P-8
HAT-P-8 is a magnitude 10 star located 700 light-years away in Pegasus. It is a F-type star about 28% more massive than the Sun. 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.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 52m 09.8636s |
| Declination | +35° 26′ 49.608″ |
| Apparent magnitude (V) | 10.17 |
| Characteristics | |
| Spectral type | F |
| Apparent magnitude (B) | 10.77 ± 0.04 |
| Apparent magnitude (V) | 10.36 ± 0.03 |
| Apparent magnitude (J) | 9.214 ± 0.022 |
| Apparent magnitude (H) | 9.004 ± 0.018 |
| Apparent magnitude (K) | 8.953 ± 0.013 |
| Variable type | planetary transit |
| Astrometry | |
| Radial velocity (Rv) | −22.2±0.3 km/s |
| Proper motion (μ) | RA: 74.676(19) mas/yr Dec.: 14.944(20) mas/yr |
| Parallax (π) | 4.6606 ± 0.0208 mas |
| Distance | 700 ± 3 ly (214.6 ± 1.0 pc) |
| Details | |
| Mass | 1.27±0.03 M☉ |
| Radius | 1.491+0.016 −0.014 R☉ |
| Surface gravity (log g) | 4.1956+0.0095 −0.013 cgs |
| Temperature | 6410±140 K |
| Metallicity [Fe/H] | -0.018+0.0072 −0.056 dex |
| Rotational velocity (v sin i) | 12.6 ± 1.0 km/s |
| Age | 3.4 ± 1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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