KELT-9 is 667 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this A star; the first was found in 2017 by transit (KELT-North).
Fly there in 3DKELT-9 b goes round its star every 35.5 hours, 59 times as often as Mercury goes round the Sun.
KELT-9 is one of 2 stars in its system. The position of the other star is not catalogued, so only KELT-9 and its planets are drawn.
| Spectral type | A |
| Surface temperature | 9,270 K |
| Mass | 2.32 solar masses |
| Radius | 2.418 solar radii |
| Luminosity | 38.9 times the Sun |
| Apparent magnitude | 7.55 |
| Age | about 0.45 billion years |
| Distance from the Sun | 666.8 light-years (204.5 parsecs) |
| Position (J2000) | RA 307.8599°, Dec 39.9389° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| KELT-9 b | 35.5 hours | 0.0337 AU | 21.701 R⊕ | 915.35 M⊕ | Transit, 2017 |
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.