Star · A2V
17 Peg
17 Peg is a main-sequence star of spectral type A2V in the constellation Pegasus, 451.9 light-years from the Sun.
| Other names | HIP 108339 |
|---|---|
| Constellation | Pegasus |
| Distance | 451.9 light-years (138.6 pc) |
| Apparent magnitude | magnitude 5.54 |
| Absolute magnitude | magnitude −0.17 |
| Spectral type | A2V |
| Surface temperature | 9,500 K |
| Luminosity | 127 L☉ |
| Radius | 4.17 R☉ |
| Mass | 3.63 M☉ (estimated) |
| Right ascension (J2000) | 21h 56m 56.4s |
| Declination (J2000) | +12° 04′ 35″ |
| Space velocity (relative to the Sun) | 25.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.54). Visible from the whole Northern Hemisphere and south to latitude 78° S. North of latitude 78° N 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 1574. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 8.0 million years.
The Sun seen from there
From a planet around 17 Peg, the Sun would look like a star of magnitude 10.54, in the direction where our sky has the constellation Hydra. 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.