Star · K2III
18 Sex
18 Sex is a giant star of spectral type K2III in the constellation Sextans, 558.3 light-years from the Sun.
| Other names | HIP 49865 |
|---|---|
| Constellation | Sextans |
| Distance | 558.3 light-years (171.2 pc) |
| Apparent magnitude | magnitude 5.64 |
| Absolute magnitude | magnitude −0.53 |
| Spectral type | K2III |
| Surface temperature | 4,110 K |
| Luminosity | 353 L☉ |
| Radius | 37 R☉ |
| Mass | 4.85 M☉ (estimated) |
| Right ascension (J2000) | 10h 10m 55.9s |
| Declination (J2000) | −8° 25′ 06″ |
| Space velocity (relative to the Sun) | 35.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.64). Visible from the whole Southern Hemisphere and north to latitude 82° N. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1468. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.9 million years.
The Sun seen from there
From a planet around 18 Sex, the Sun would look like a star of magnitude 11.00, in the direction where our sky has the constellation Pegasus. 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.