Star · A8V
KOI-12
KOI-12 is a main-sequence star of spectral type A8V in the constellation Cygnus, 1,323 light-years from the Sun. It is orbited by 2 confirmed exoplanet(s).
| Constellation | Cygnus |
|---|---|
| Distance | 1,323 light-years (405.8 pc) |
| Apparent magnitude | magnitude 11.54 |
| Absolute magnitude | magnitude 3.50 |
| Spectral type | A8V |
| Surface temperature | 6,640 K |
| Luminosity | 4.23 L☉ |
| Radius | 1.4 R☉ |
| Mass | 1.5 M☉ |
| Age | 1.5 billion years |
| Metallicity [Fe/H] | 0.08 |
| Right ascension (J2000) | 19h 49m 48.9s |
| Declination (J2000) | +41° 00′ 40″ |
| Space velocity (relative to the Sun) | 18.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.54. Visible from the whole Northern Hemisphere and south to latitude 49° S. North of latitude 49° 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 703. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 23 million years.
The Sun seen from there
From a planet around KOI-12, the Sun would look like a star of magnitude 12.87, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- KOI-12 b 17.9-day orbit · 13.8 R⊕
- Kepler-448 c 2,500-day orbit · 12 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.