Star · B9V
4 Aql
4 Aql is a main-sequence star of spectral type B9V in the constellation Aquila, 484.7 light-years from the Sun.
| Other names | HIP 91975 |
|---|---|
| Constellation | Aquila |
| Distance | 484.7 light-years (148.6 pc) |
| Apparent magnitude | magnitude 5.02 |
| Absolute magnitude | magnitude −0.84 |
| Spectral type | B9V |
| Surface temperature | 10,870 K |
| Luminosity | 294 L☉ |
| Radius | 4.83 R☉ |
| Mass | 4.61 M☉ (estimated) |
| Right ascension (J2000) | 18h 44m 49.9s |
| Declination (J2000) | +2° 03′ 36″ |
| Space velocity (relative to the Sun) | 17.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.02). Visible from the whole Northern Hemisphere and south to latitude 88° S. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1541. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 8.6 million years.
The Sun seen from there
From a planet around 4 Aql, the Sun would look like a star of magnitude 10.69, in the direction where our sky has the constellation Monoceros. 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.