Star · A5-A6
HIP 99770
HIP 99770 is a main-sequence star of spectral type A5-A6 in the constellation Cygnus, 132.9 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | 29 Cyg |
|---|---|
| Constellation | Cygnus |
| Distance | 132.9 light-years (40.7 pc) |
| Apparent magnitude | magnitude 4.93 |
| Absolute magnitude | magnitude 1.88 |
| Spectral type | A5-A6 |
| Surface temperature | 8,000 K |
| Luminosity | 13.9 L☉ |
| Radius | 1.94 R☉ |
| Mass | 1.9 M☉ |
| Age | 0.3 billion years |
| Right ascension (J2000) | 20h 14m 32.0s |
| Declination (J2000) | +36° 48′ 23″ |
| Space velocity (relative to the Sun) | 27.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.93). Visible from the whole Northern Hemisphere and south to latitude 53° S. North of latitude 53° 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 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 HIP 99770, the Sun would look like a star of magnitude 7.88, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- HIP 99770 b 18,600-day orbit · 12.2 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- η Cyg 11.2 light-years
- Gaia-5 12.5 light-years
- HIP 98381 15.4 light-years
- HIP 97337 16.4 light-years
- HIP 101268 18.2 light-years
- HIP 102237 18.3 light-years
- HIP 102320 19.3 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.