Star · K0III
9 Hya
9 Hya is a giant star of spectral type K0III in the constellation Hydra, 207.6 light-years from the Sun.
| Other names | HIP 42662 |
|---|---|
| Constellation | Hydra |
| Distance | 207.6 light-years (63.7 pc) |
| Apparent magnitude | magnitude 4.87 |
| Absolute magnitude | magnitude 0.85 |
| Spectral type | K0III |
| Surface temperature | 4,600 K |
| Luminosity | 66.9 L☉ |
| Radius | 12.9 R☉ |
| Mass | 3.02 M☉ (estimated) |
| Right ascension (J2000) | 8h 41m 43.3s |
| Declination (J2000) | −15° 56′ 36″ |
| Space velocity (relative to the Sun) | 29.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.87). Visible from the whole Southern Hemisphere and north to latitude 74° N. South of latitude 74° S it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1818. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.7 million years.
The Sun seen from there
From a planet around 9 Hya, the Sun would look like a star of magnitude 8.85, in the direction where our sky has the constellation Delphinus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- 12 Hya 9.81 light-years
- HIP 43655 13.4 light-years
- HIP 43558 14.0 light-years
- HIP 43777 18.8 light-years
- HIP 43920 19.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.