Star · K5
HIP 100781
HIP 100781 is a supergiant star of spectral type K5 in the constellation Delphinus, 848.3 light-years from the Sun.
| Constellation | Delphinus |
|---|---|
| Distance | 848.3 light-years (260.1 pc) |
| Apparent magnitude | magnitude 6.35 |
| Absolute magnitude | magnitude −0.73 |
| Spectral type | K5 |
| Surface temperature | 3,870 K |
| Luminosity | 560 L☉ |
| Radius | 52.7 R☉ |
| Mass | 5.54 M☉ (estimated) |
| Right ascension (J2000) | 20h 26m 01.6s |
| Declination (J2000) | +13° 54′ 42″ |
| Space velocity (relative to the Sun) | 81.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.35). Visible from the whole Northern Hemisphere and south to latitude 76° S. North of latitude 76° 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 1178. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 15 million years.
The Sun seen from there
From a planet around HIP 100781, the Sun would look like a star of magnitude 11.91, in the direction where our sky has the constellation Puppis. 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.