Star · A
KELT-9
KELT-9 is a main-sequence star of spectral type A in the constellation Cygnus, 675.9 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 101252 |
|---|---|
| Constellation | Cygnus |
| Distance | 675.9 light-years (207.2 pc) |
| Apparent magnitude | magnitude 7.59 |
| Absolute magnitude | magnitude 1.01 |
| Spectral type | A |
| Surface temperature | 9,270 K |
| Luminosity | 38.9 L☉ |
| Radius | 2.42 R☉ |
| Mass | 2.32 M☉ |
| Age | 0.5 billion years |
| Metallicity [Fe/H] | 0.07 |
| Right ascension (J2000) | 20h 31m 26.3s |
| Declination (J2000) | +39° 56′ 20″ |
| Space velocity (relative to the Sun) | 33.3 km/s |
In the sky
Too faint for the naked eye (magnitude 7.59); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 50° S. North of latitude 50° 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 1350. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 12 million years.
The Sun seen from there
From a planet around KELT-9, the Sun would look like a star of magnitude 11.41, in the direction where our sky has the constellation Vela. It would be invisible to the naked eye.
Planets
- KELT-9 b 1.48-day orbit · 21.7 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.