Star · K3 III
17 Sco
17 Sco is a giant star of spectral type K3 III in the constellation Scorpius, 447.6 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | χ Sco · HIP 79540 |
|---|---|
| Constellation | Scorpius |
| Distance | 447.6 light-years (137.2 pc) |
| Apparent magnitude | magnitude 5.24 |
| Absolute magnitude | magnitude −0.45 |
| Spectral type | K3 III |
| Surface temperature | 4,160 K |
| Luminosity | 180 L☉ |
| Radius | 25.9 R☉ |
| Mass | 1.22 M☉ |
| Age | 5.1 billion years |
| Metallicity [Fe/H] | -0.01 |
| Right ascension (J2000) | 16h 13m 50.9s |
| Declination (J2000) | −11° 50′ 16″ |
| Space velocity (relative to the Sun) | 24.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.24). Visible from the whole Southern Hemisphere and north to latitude 78° N. South of latitude 78° S 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 1578. 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 17 Sco, the Sun would look like a star of magnitude 10.52, in the direction where our sky has the constellation Taurus. It would be invisible to the naked eye.
Planets
- 17 Sco b 578-day orbit · 12.9 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.