Star · G1V
Kepler-4
Kepler-4 is a main-sequence star of spectral type G1V in the constellation Draco, 1,591 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Draco |
|---|---|
| Distance | 1,591 light-years (487.9 pc) |
| Apparent magnitude | magnitude 12.29 |
| Absolute magnitude | magnitude 3.85 |
| Spectral type | G1V |
| Surface temperature | 5,860 K |
| Luminosity | 2.26 L☉ |
| Radius | 1.49 R☉ |
| Mass | 1.22 M☉ |
| Age | 4.5 billion years |
| Metallicity [Fe/H] | 0.17 |
| Right ascension (J2000) | 19h 02m 27.7s |
| Declination (J2000) | +50° 08′ 09″ |
| Space velocity (relative to the Sun) | 17.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.29. Visible from the whole Northern Hemisphere and south to latitude 40° S. North of latitude 40° 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 435. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 28 million years.
The Sun seen from there
From a planet around Kepler-4, the Sun would look like a star of magnitude 13.27, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- Kepler-4 b 3.21-day orbit · 4 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.