Star · K1III
42 Aqr
42 Aqr is a giant star of spectral type K1III in the constellation Aquarius, 439.1 light-years from the Sun.
| Other names | HIP 110000 |
|---|---|
| Constellation | Aquarius |
| Distance | 439.1 light-years (134.6 pc) |
| Apparent magnitude | magnitude 5.34 |
| Absolute magnitude | magnitude −0.31 |
| Spectral type | K1III |
| Surface temperature | 4,450 K |
| Luminosity | 215 L☉ |
| Radius | 24.7 R☉ |
| Mass | 4.22 M☉ (estimated) |
| Right ascension (J2000) | 22h 16m 48.0s |
| Declination (J2000) | −12° 49′ 53″ |
| Space velocity (relative to the Sun) | 12.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.34). 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 1587. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.8 million years.
The Sun seen from there
From a planet around 42 Aqr, the Sun would look like a star of magnitude 10.48, in the direction where our sky has the constellation Leo. 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.