Star · G2I
HIP 104822
HIP 104822 is a supergiant star of spectral type G2I in the constellation Cygnus, 1,603 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 1,603 light-years (491.6 pc) |
| Apparent magnitude | magnitude 6.18 |
| Absolute magnitude | magnitude −2.28 |
| Spectral type | G2I |
| Surface temperature | 4,500 K |
| Luminosity | 1,270 L☉ |
| Radius | 58.6 R☉ |
| Mass | 7 M☉ (estimated) |
| Right ascension (J2000) | 21h 14m 10.3s |
| Declination (J2000) | +29° 54′ 03″ |
| Space velocity (relative to the Sun) | 9.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.18). Visible from the whole Northern Hemisphere and south to latitude 60° S. North of latitude 60° 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 423. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 28 million years.
The Sun seen from there
From a planet around HIP 104822, the Sun would look like a star of magnitude 13.29, in the direction where our sky has the constellation Pyxis. 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.