HAT-P-8 is 690 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this F6 star; the first was found in 2008 by transit (HATNet).
Fly there in 3DHAT-P-8 b goes round its star every 3.08 days, 29 times as often as Mercury goes round the Sun.
HAT-P-8 is one of 3 stars in its system: the others are drawn where the Washington Double Star Catalog measures them on the sky.
| Spectral type | F6 |
| Surface temperature | 6,200 K |
| Mass | 1.27 solar masses |
| Radius | 1.57 solar radii |
| Luminosity | 3.304 times the Sun |
| Apparent magnitude | 10.358 |
| Age | about 3.4 billion years |
| Distance from the Sun | 690.0 light-years (211.6 parsecs) |
| Position (J2000) | RA 343.0415°, Dec 35.4472° |
| Constellation | Pegasus |
HAT-P-8 B is a M5V star of magnitude 14.5, judged a true companion. In 2013 it was 1″ from HAT-P-8, at position angle 138° (Washington Double Star Catalog, 22522+3527 BRG 35 AB): 212 AU on the sky at this distance. The true distance can only be larger.
HAT-P-8 C is a M6V star of magnitude 15, judged a true companion. In 2013 it was 1″ from HAT-P-8, at position angle 141° (Washington Double Star Catalog, 22522+3527 BEC 2 AC): 212 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HAT-P-8 b | 3.08 days | 0.0450 AU | 15.693 R⊕ | 406.82 M⊕ | Transit, 2008 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.