Star · F9V
Kepler-123
Kepler-123 is a main-sequence star of spectral type F9V in the constellation Cygnus, 3,332 light-years from the Sun. It is orbited by 2 confirmed exoplanet(s).
| Constellation | Cygnus |
|---|---|
| Distance | 3,332 light-years (1,022 pc) |
| Apparent magnitude | magnitude 14.13 |
| Absolute magnitude | magnitude 4.08 |
| Spectral type | F9V |
| Surface temperature | 6,090 K |
| Luminosity | 2.57 L☉ |
| Radius | 1.26 R☉ |
| Mass | 1.08 M☉ |
| Age | 5.0 billion years |
| Metallicity [Fe/H] | -0.08 |
| Right ascension (J2000) | 19h 47m 59.7s |
| Declination (J2000) | +42° 46′ 55″ |
| Space velocity (relative to the Sun) | 5.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.13. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° 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 1307 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 59 million years.
The Sun seen from there
From a planet around Kepler-123, the Sun would look like a star of magnitude 14.88, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- Kepler-123 b 17.2-day orbit · 2.94 R⊕
- Kepler-123 c 26.7-day orbit · 1.48 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.