Star · F0III
20 Aqr
20 Aqr is a giant star of spectral type F0III in the constellation Aquarius, 213.6 light-years from the Sun.
| Other names | HIP 105729 |
|---|---|
| Constellation | Aquarius |
| Distance | 213.6 light-years (65.5 pc) |
| Apparent magnitude | magnitude 6.38 |
| Absolute magnitude | magnitude 2.30 |
| Spectral type | F0III |
| Surface temperature | 7,250 K |
| Luminosity | 10.3 L☉ |
| Radius | 2.03 R☉ |
| Mass | 1.79 M☉ (estimated) |
| Right ascension (J2000) | 21h 24m 51.7s |
| Declination (J2000) | −3° 23′ 54″ |
| Space velocity (relative to the Sun) | 27.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.38). Visible from the whole Southern Hemisphere and north to latitude 87° N. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1812. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.8 million years.
The Sun seen from there
From a planet around 20 Aqr, the Sun would look like a star of magnitude 8.91, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 105661 8.49 light-years
- HIP 105120 11.2 light-years
- HIP 105641 12.1 light-years
- HIP 105947 13.9 light-years
- SIMP J21174252-0611132 16.0 light-years
- HIP 105359 16.7 light-years
- 2MASS J21203387-0747208 17.3 light-years
- HIP 105899 18.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.