Star · F8 V
Irena
Irena is a main-sequence star of spectral type F8 V in the constellation Hercules, 444.5 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | WASP-38 |
|---|---|
| Constellation | Hercules |
| Distance | 444.5 light-years (136.3 pc) |
| Apparent magnitude | magnitude 9.45 |
| Absolute magnitude | magnitude 3.78 |
| Spectral type | F8 V |
| Surface temperature | 6,180 K |
| Luminosity | 2.84 L☉ |
| Radius | 1.52 R☉ |
| Mass | 1.76 M☉ |
| Age | 3.3 billion years |
| Metallicity [Fe/H] | -0.02 |
| Right ascension (J2000) | 16h 15m 50.4s |
| Declination (J2000) | +10° 01′ 57″ |
| Space velocity (relative to the Sun) | 33.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.45. Visible from the whole Northern Hemisphere and south to latitude 80° S. North of latitude 80° N it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1581. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.9 million years.
The Sun seen from there
From a planet around Irena, the Sun would look like a star of magnitude 10.50, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Planets
- WASP-38 b 6.87-day orbit · 13.8 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.