Star · M4
GJ 4257
GJ 4257 is a main-sequence star of spectral type M4 in the constellation Pegasus, 57.6 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 57.6 light-years (17.7 pc) |
| Apparent magnitude | magnitude 13.60 |
| Absolute magnitude | magnitude 12.36 |
| Spectral type | M4 |
| Surface temperature | 3,650 K |
| Luminosity | 0.00438 L☉ |
| Radius | 0.166 R☉ |
| Mass | 0.179 M☉ (estimated) |
| Right ascension (J2000) | 22h 06m 46.5s |
| Declination (J2000) | +3° 25′ 02″ |
| Space velocity (relative to the Sun) | 47.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.60. Visible from the whole Northern Hemisphere and south to latitude 87° S. 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 1968. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.0 million years.
The Sun seen from there
From a planet around GJ 4257, the Sun would look like a star of magnitude 6.07, in the direction where our sky has the constellation Sextans. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- WISEPC J222623.05+044003.9 5.86 light-years
- WISEPC J221354.69+091139.4 6.51 light-years
- GJ 4283 7.43 light-years
- GJ 9773 7.69 light-years
- GJ 4203A 8.63 light-years
- 2MASS J21522609+0937575 9.85 light-years
- GJ 4216 10.9 light-years
- SDSS J212413.89+010000.3 10.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.