Star · K0
Gl 840
Gl 840 is a main-sequence star of spectral type K0 in the constellation Pegasus, 66.5 light-years from the Sun.
| Other names | HIP 108156 |
|---|---|
| Constellation | Pegasus |
| Distance | 66.5 light-years (20.4 pc) |
| Apparent magnitude | magnitude 7.73 |
| Absolute magnitude | magnitude 6.18 |
| Spectral type | K0 |
| Surface temperature | 4,970 K |
| Luminosity | 0.401 L☉ |
| Radius | 0.855 R☉ |
| Mass | 0.796 M☉ (estimated) |
| Right ascension (J2000) | 21h 54m 45.1s |
| Declination (J2000) | +32° 19′ 43″ |
| Space velocity (relative to the Sun) | 33.2 km/s |
In the sky
Too faint for the naked eye (magnitude 7.73); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° 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 1960. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
The Sun seen from there
From a planet around Gl 840, the Sun would look like a star of magnitude 6.38, in the direction where our sky has the constellation Antlia. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.