Star · B9
25 Sex
25 Sex is a main-sequence star of spectral type B9 in the constellation Sextans, 345.5 light-years from the Sun.
| Other names | HIP 50885 |
|---|---|
| Constellation | Sextans |
| Distance | 345.5 light-years (105.9 pc) |
| Apparent magnitude | magnitude 5.93 |
| Absolute magnitude | magnitude 0.81 |
| Spectral type | B9 |
| Surface temperature | 10,770 K |
| Luminosity | 63.4 L☉ |
| Radius | 2.29 R☉ |
| Mass | 2.97 M☉ (estimated) |
| Right ascension (J2000) | 10h 23m 26.5s |
| Declination (J2000) | −4° 04′ 27″ |
| Space velocity (relative to the Sun) | 34.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.93). Visible from the whole Southern Hemisphere and north to latitude 86° 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 1681. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.1 million years.
The Sun seen from there
From a planet around 25 Sex, the Sun would look like a star of magnitude 9.95, 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.