Star · F8V
WASP-138
WASP-138 is a main-sequence star of spectral type F8V in the constellation Cetus, 1,351 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Cetus |
|---|---|
| Distance | 1,351 light-years (414.2 pc) |
| Apparent magnitude | magnitude 11.80 |
| Absolute magnitude | magnitude 3.71 |
| Spectral type | F8V |
| Surface temperature | 6,270 K |
| Luminosity | 2.72 L☉ |
| Radius | 1.36 R☉ |
| Mass | 1.22 M☉ |
| Age | 3.4 billion years |
| Metallicity [Fe/H] | -0.09 |
| Right ascension (J2000) | 2h 46m 33.4s |
| Declination (J2000) | −0° 27′ 51″ |
| Space velocity (relative to the Sun) | 71.2 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.80. Visible from the whole Southern Hemisphere and north to latitude 90° N. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 675. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 24 million years.
The Sun seen from there
From a planet around WASP-138, the Sun would look like a star of magnitude 12.92, in the direction where our sky has the constellation Virgo. It would be invisible to the naked eye.
Planets
- WASP-138 b 3.63-day orbit · 12.2 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.