Star · B2IV
23 Sex
23 Sex is a subgiant star of spectral type B2IV in the constellation Sextans, 2,808 light-years from the Sun.
| Other names | HIP 50684 |
|---|---|
| Constellation | Sextans |
| Distance | 2,808 light-years (861.1 pc) |
| Apparent magnitude | magnitude 6.66 |
| Absolute magnitude | magnitude −3.02 |
| Spectral type | B2IV |
| Surface temperature | 11,470 K |
| Luminosity | 2,400 L☉ |
| Radius | 12.4 R☉ |
| Mass | 8.4 M☉ (estimated) |
| Right ascension (J2000) | 10h 21m 02.0s |
| Declination (J2000) | +2° 17′ 23″ |
| Space velocity (relative to the Sun) | 36.8 km/s |
In the sky
Too faint for the naked eye (magnitude 6.66); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 88° S. 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 783 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 50 million years.
The Sun seen from there
From a planet around 23 Sex, the Sun would look like a star of magnitude 14.51, in the direction where our sky has the constellation Aquarius. 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.