Star · K0III
18 Sgr
18 Sgr is a giant star of spectral type K0III in the constellation Sagittarius, 569.2 light-years from the Sun.
| Other names | HIP 90260 |
|---|---|
| Constellation | Sagittarius |
| Distance | 569.2 light-years (174.5 pc) |
| Apparent magnitude | magnitude 5.58 |
| Absolute magnitude | magnitude −0.63 |
| Spectral type | K0III |
| Surface temperature | 4,430 K |
| Luminosity | 293 L☉ |
| Radius | 29 R☉ |
| Mass | 4.6 M☉ (estimated) |
| Right ascension (J2000) | 18h 25m 01.4s |
| Declination (J2000) | −30° 45′ 24″ |
| Space velocity (relative to the Sun) | 128.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.58). Visible from the whole Southern Hemisphere and north to latitude 59° N. South of latitude 59° S it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1457. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 10 million years.
The Sun seen from there
From a planet around 18 Sgr, the Sun would look like a star of magnitude 11.04, in the direction where our sky has the constellation Auriga. 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.