Star · B9IV
55 Hya
55 Hya is a subgiant star of spectral type B9IV in the constellation Hydra, 545.2 light-years from the Sun.
| Other names | HIP 72323 |
|---|---|
| Constellation | Hydra |
| Distance | 545.2 light-years (167.2 pc) |
| Apparent magnitude | magnitude 5.61 |
| Absolute magnitude | magnitude −0.51 |
| Spectral type | B9IV |
| Surface temperature | 10,700 K |
| Luminosity | 210 L☉ |
| Radius | 4.22 R☉ |
| Mass | 4.18 M☉ (estimated) |
| Right ascension (J2000) | 14h 47m 22.6s |
| Declination (J2000) | −25° 37′ 27″ |
| Space velocity (relative to the Sun) | 25.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.61). 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 1481. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.7 million years.
The Sun seen from there
From a planet around 55 Hya, the Sun would look like a star of magnitude 10.95, in the direction where our sky has the constellation Aries. 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.