Star · G9/K0
Kepler-421
Kepler-421 is a main-sequence star of spectral type G9/K0 in the constellation Lyra, 1,137 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Lyra |
|---|---|
| Distance | 1,137 light-years (348.6 pc) |
| Apparent magnitude | magnitude 13.61 |
| Absolute magnitude | magnitude 5.90 |
| Spectral type | G9/K0 |
| Surface temperature | 5,310 K |
| Luminosity | 0.4 L☉ |
| Radius | 0.757 R☉ |
| Mass | 0.794 M☉ |
| Age | 4.0 billion years |
| Metallicity [Fe/H] | -0.25 |
| Right ascension (J2000) | 18h 53m 01.6s |
| Declination (J2000) | +45° 05′ 16″ |
| Space velocity (relative to the Sun) | 34.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.61. Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° 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 the year 889. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 20 million years.
The Sun seen from there
From a planet around Kepler-421, the Sun would look like a star of magnitude 12.54, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- Kepler-421 b 704-day orbit · 4.16 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.