Star · A9IV
4 Peg
4 Peg is a subgiant star of spectral type A9IV in the constellation Pegasus, 171.2 light-years from the Sun.
| Other names | HIP 106856 |
|---|---|
| Constellation | Pegasus |
| Distance | 171.2 light-years (52.5 pc) |
| Apparent magnitude | magnitude 5.66 |
| Absolute magnitude | magnitude 2.06 |
| Spectral type | A9IV |
| Surface temperature | 7,690 K |
| Luminosity | 13.2 L☉ |
| Radius | 2.05 R☉ |
| Mass | 1.91 M☉ (estimated) |
| Right ascension (J2000) | 21h 38m 31.9s |
| Declination (J2000) | +5° 46′ 18″ |
| Space velocity (relative to the Sun) | 34.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.66). Visible from the whole Northern Hemisphere and south to latitude 84° S. 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 1855. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.0 million years.
The Sun seen from there
From a planet around 4 Peg, the Sun would look like a star of magnitude 8.43, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 107107 7.34 light-years
- HIP 106534 8.53 light-years
- HIP 107181 12.1 light-years
- HIP 106707 13.1 light-years
- SDSS J213352.72+101841.0 14.0 light-years
- CFBDS J212243.69+042941.9 15.1 light-years
- HIP 105639 18.3 light-years
- CFBDS J212702.19+002344.7 18.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.