Star · A5 V
HR 8799
HR 8799 is a main-sequence star of spectral type A5 V in the constellation Pegasus, 133.3 light-years from the Sun. It is orbited by 4 confirmed exoplanet(s).
| Other names | HIP 114189 |
|---|---|
| Constellation | Pegasus |
| Distance | 133.3 light-years (40.9 pc) |
| Apparent magnitude | magnitude 5.97 |
| Absolute magnitude | magnitude 2.91 |
| Spectral type | A5 V |
| Surface temperature | 7,200 K |
| Luminosity | 4.92 L☉ |
| Radius | 1.49 R☉ |
| Mass | 1.5 M☉ |
| Age | 0.1 billion years |
| Metallicity [Fe/H] | -0.47 |
| Right ascension (J2000) | 23h 07m 28.7s |
| Declination (J2000) | +21° 08′ 03″ |
| Space velocity (relative to the Sun) | 25.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.97). Visible from the whole Northern Hemisphere and south to latitude 69° S. North of latitude 69° N it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1893. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
The Sun seen from there
From a planet around HR 8799, the Sun would look like a star of magnitude 7.89, in the direction where our sky has the constellation Crater. It would be invisible to the naked eye.
Planets
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 114081 6.66 light-years
- HIP 113086 8.49 light-years
- HIP 115417 10.6 light-years
- HIP 113994 12.9 light-years
- HIP 112389 12.9 light-years
- HIP 112523 13.5 light-years
- HIP 114543 13.9 light-years
- Markab 13.9 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.