Star · G5V
KOI-217
KOI-217 is a main-sequence star of spectral type G5V in the constellation Cygnus, 2,983 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Cygnus |
|---|---|
| Distance | 2,983 light-years (914.7 pc) |
| Apparent magnitude | magnitude 15.26 |
| Absolute magnitude | magnitude 5.45 |
| Spectral type | G5V |
| Surface temperature | 5,550 K |
| Luminosity | 0.678 L☉ |
| Radius | 0.86 R☉ |
| Mass | 0.95 M☉ |
| Age | 1.7 billion years |
| Metallicity [Fe/H] | 0.12 |
| Right ascension (J2000) | 19h 39m 27.7s |
| Declination (J2000) | +46° 17′ 09″ |
| Space velocity (relative to the Sun) | 11.2 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 15.26. Visible from the whole Northern Hemisphere and south to latitude 44° S. North of latitude 44° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 958 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 53 million years.
The Sun seen from there
From a planet around KOI-217, the Sun would look like a star of magnitude 14.64, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- KOI-217 b 3.91-day orbit · 12.4 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.