Star · F7V
HIP 102804
HIP 102804 is a main-sequence star of spectral type F7V in the constellation Cygnus, 1,056 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 1,056 light-years (323.8 pc) |
| Apparent magnitude | magnitude 6.50 |
| Absolute magnitude | magnitude −1.05 |
| Spectral type | F7V |
| Surface temperature | 3,620 K |
| Luminosity | 1,070 L☉ |
| Radius | 83.3 R☉ |
| Mass | 6.66 M☉ (estimated) |
| Right ascension (J2000) | 20h 49m 37.7s |
| Declination (J2000) | +50° 07′ 38″ |
| Space velocity (relative to the Sun) | 27.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.50). Visible from the whole Northern Hemisphere and south to latitude 40° S. North of latitude 40° 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 970. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 19 million years.
The Sun seen from there
From a planet around HIP 102804, the Sun would look like a star of magnitude 12.38, in the direction where our sky has the constellation Vela. 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.