Kepler-1991 is 2,791 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 5,478 K star; the first was found in 2023 by transit (Kepler).
Fly there in 3DKepler-1991 b goes round its star every 13.3 days, 7 times as often as Mercury goes round the Sun.
| Surface temperature | 5,478 K |
| Mass | 0.914 solar masses |
| Radius | 1.053 solar radii |
| Luminosity | 0.7789 times the Sun |
| Apparent magnitude | 15.048 |
| Age | about 6.76 billion years |
| Distance from the Sun | 2791.3 light-years (855.8 parsecs) |
| Position (J2000) | RA 285.0361°, Dec 45.0710° |
| Constellation | Lyra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-1991 b | 13.3 days | 0.106 AU | 1.47 R⊕ | 2.76 M⊕ estimated | Transit, 2023 |
| Kepler-1991 c | 22.8 days | 0.153 AU | 2.57 R⊕ | 7.13 M⊕ estimated | Transit, 2023 |
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 5,478 K, 0.78 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.85 to 1.52 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 2,791 years ago, around 800 BC.