Star · F0V
18 Aqr
18 Aqr is a main-sequence star of spectral type F0V in the constellation Aquarius, 154.7 light-years from the Sun.
| Other names | HIP 105668 |
|---|---|
| Constellation | Aquarius |
| Distance | 154.7 light-years (47.4 pc) |
| Apparent magnitude | magnitude 5.48 |
| Absolute magnitude | magnitude 2.10 |
| Spectral type | F0V |
| Surface temperature | 7,480 K |
| Luminosity | 12.5 L☉ |
| Radius | 2.11 R☉ |
| Mass | 1.88 M☉ (estimated) |
| Right ascension (J2000) | 21h 24m 11.5s |
| Declination (J2000) | −12° 52′ 41″ |
| Space velocity (relative to the Sun) | 21.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.48). Visible from the whole Southern Hemisphere and north to latitude 77° N. South of latitude 77° S it never sets. 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 1871. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.7 million years.
The Sun seen from there
From a planet around 18 Aqr, the Sun would look like a star of magnitude 8.21, in the direction where our sky has the constellation Leo. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.