Star · K0II
25 Sco
25 Sco is a bright giant star of spectral type K0II in the constellation Scorpius, 929.5 light-years from the Sun.
| Other names | HIP 82140 |
|---|---|
| Constellation | Scorpius |
| Distance | 929.5 light-years (285.0 pc) |
| Apparent magnitude | magnitude 6.72 |
| Absolute magnitude | magnitude −0.55 |
| Spectral type | K0II |
| Surface temperature | 4,350 K |
| Luminosity | 291 L☉ |
| Radius | 30 R☉ |
| Mass | 4.59 M☉ (estimated) |
| Right ascension (J2000) | 16h 46m 51.3s |
| Declination (J2000) | −25° 31′ 43″ |
| Space velocity (relative to the Sun) | 21.7 km/s |
In the sky
Too faint for the naked eye (magnitude 6.72); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 64° N. South of latitude 64° 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 1097. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 16 million years.
The Sun seen from there
From a planet around 25 Sco, the Sun would look like a star of magnitude 12.10, in the direction where our sky has the constellation Taurus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.