Star · M5
Gl 747B
Gl 747B is a main-sequence star of spectral type M5 in the constellation Lyra, 26.6 light-years from the Sun.
| Constellation | Lyra |
|---|---|
| Distance | 26.6 light-years (8.16 pc) |
| Apparent magnitude | magnitude 12.16 |
| Absolute magnitude | magnitude 12.60 |
| Spectral type | M5 |
| Surface temperature | 3,790 K |
| Luminosity | 0.00286 L☉ |
| Radius | 0.124 R☉ |
| Mass | 0.149 M☉ (estimated) |
| Right ascension (J2000) | 19h 07m 42.0s |
| Declination (J2000) | +32° 32′ 38″ |
| Space velocity (relative to the Sun) | 64.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.16. Visible from the whole Northern Hemisphere and south to latitude 57° S. North of latitude 57° 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 1999. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 472 thousand years.
The Sun seen from there
From a planet around Gl 747B, the Sun would look like a star of magnitude 4.39, in the direction where our sky has the constellation Canis Major. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 747A 0.00 light-years
- Vega 4.27 light-years
- WISE J200050.19+362950.1 5.59 light-years
- WISE J192841.35+235604.9 5.99 light-years
- Gl 745A 6.04 light-years
- Gl 745B 6.04 light-years
- GJ 1230A 7.63 light-years
- GJ 1230B 7.66 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.