Star · A7IV
21 Vul
21 Vul is a subgiant star of spectral type A7IV in the constellation Vulpecula, 312.7 light-years from the Sun.
| Other names | HIP 99738 |
|---|---|
| Constellation | Vulpecula |
| Distance | 312.7 light-years (95.9 pc) |
| Apparent magnitude | magnitude 5.19 |
| Absolute magnitude | magnitude 0.28 |
| Spectral type | A7IV |
| Surface temperature | 8,230 K |
| Luminosity | 71.4 L☉ |
| Radius | 4.15 R☉ |
| Mass | 3.07 M☉ (estimated) |
| Right ascension (J2000) | 20h 14m 14.5s |
| Declination (J2000) | +28° 41′ 41″ |
| Space velocity (relative to the Sun) | 12.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.19). Visible from the whole Northern Hemisphere and south to latitude 61° S. North of latitude 61° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1713. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.5 million years.
The Sun seen from there
From a planet around 21 Vul, the Sun would look like a star of magnitude 9.74, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 99467 14.4 light-years
- 23 Vul 15.5 light-years
- HIP 99975 15.6 light-years
- HIP 98881 17.9 light-years
- HIP 99315 18.7 light-years
- HIP 99106 19.9 light-years
- HIP 98831 19.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.