Star · F5V
GJ 4237A
GJ 4237A is a main-sequence star of spectral type F5V in the constellation Pegasus, 1,511 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 1,511 light-years (463.3 pc) |
| Apparent magnitude | magnitude 10.00 |
| Absolute magnitude | magnitude 1.67 |
| Spectral type | F5V |
| Surface temperature | 6,640 K |
| Luminosity | 18.3 L☉ |
| Radius | 3.23 R☉ |
| Mass | 2.08 M☉ (estimated) |
| Right ascension (J2000) | 21h 55m 38.6s |
| Declination (J2000) | +33° 02′ 12″ |
| Space velocity (relative to the Sun) | 26.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.00. 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 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 515. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 27 million years.
The Sun seen from there
From a planet around GJ 4237A, the Sun would look like a star of magnitude 13.16, in the direction where our sky has the constellation Antlia. 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.