Star · A2
GJ 4171
GJ 4171 is a main-sequence star of spectral type A2 in the constellation Cygnus, 1,055 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 1,055 light-years (323.5 pc) |
| Apparent magnitude | magnitude 9.00 |
| Absolute magnitude | magnitude 1.45 |
| Spectral type | A2 |
| Surface temperature | 8,800 K |
| Luminosity | 26 L☉ |
| Radius | 2.19 R☉ |
| Mass | 2.3 M☉ (estimated) |
| Right ascension (J2000) | 20h 56m 51.9s |
| Declination (J2000) | +42° 55′ 46″ |
| Space velocity (relative to the Sun) | 20.1 km/s |
In the sky
Too faint for the naked eye (magnitude 9.00); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° 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 971. 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 GJ 4171, 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.