KOI-3503 is 2,893 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 6,001 K star; the first was found in 2021 by transit (Kepler).
Fly there in 3DKOI-3503 b goes round its star every 21.2 days, 4 times as often as Mercury goes round the Sun.
| Surface temperature | 6,001 K |
| Mass | 0.858 solar masses |
| Radius | 1.255 solar radii |
| Luminosity | 1.995 times the Sun |
| Apparent magnitude | 13.831 |
| Age | about 11.48 billion years |
| Distance from the Sun | 2893.2 light-years (887.1 parsecs) |
| Position (J2000) | RA 293.1508°, Dec 41.7292° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| KOI-3503 b | 21.2 days | 0.142 AU | 1.19 R⊕ | 9.2 M⊕ | Transit, 2021 |
| KOI-3503 c | 31.8 days | 0.187 AU | 1.21 R⊕ | 10.36 M⊕ | Transit, 2021 |
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.
For a star of 6,001 K, 2.0 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 1.32 to 2.32 AU. None of its known planets orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.
The light you see left 2,893 years ago, around 900 BC.