Star · G9 III
Formosa
Formosa is a giant star of spectral type G9 III in the constellation Leo, 450.8 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HD 100655 · HIP 56508 |
|---|---|
| Constellation | Leo |
| Distance | 450.8 light-years (138.2 pc) |
| Apparent magnitude | magnitude 6.45 |
| Absolute magnitude | magnitude 0.75 |
| Spectral type | G9 III |
| Surface temperature | 4,890 K |
| Luminosity | 43 L☉ |
| Radius | 10.1 R☉ |
| Mass | 2.28 M☉ |
| Age | 1.3 billion years |
| Metallicity [Fe/H] | 0.07 |
| Right ascension (J2000) | 11h 35m 03.8s |
| Declination (J2000) | +20° 26′ 30″ |
| Space velocity (relative to the Sun) | 39.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.45). Visible from the whole Northern Hemisphere and south to latitude 70° S. North of latitude 70° N it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1575. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 8.0 million years.
The Sun seen from there
From a planet around Formosa, the Sun would look like a star of magnitude 10.53, in the direction where our sky has the constellation Aquarius. It would be invisible to the naked eye.
Planets
- HD 100655 b 158-day orbit · 13.5 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.