Star · ?
GJ 4221
GJ 4221 is a main-sequence star of spectral type ? in the constellation Aquarius, 108.5 light-years from the Sun.
| Constellation | Aquarius |
|---|---|
| Distance | 108.5 light-years (33.3 pc) |
| Apparent magnitude | magnitude 13.87 |
| Absolute magnitude | magnitude 11.26 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.0121 L☉ |
| Radius | 0.275 R☉ |
| Mass | 0.278 M☉ (estimated) |
| Right ascension (J2000) | 21h 48m 10.6s |
| Declination (J2000) | +1° 26′ 42″ |
| Space velocity (relative to the Sun) | 35.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.87. Visible from the whole Northern Hemisphere and south to latitude 89° 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 1917. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.9 million years.
The Sun seen from there
From a planet around GJ 4221, the Sun would look like a star of magnitude 7.44, in the direction where our sky has the constellation Sextans. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 107941 8.56 light-years
- SIMP J21570693-0130348 10.0 light-years
- GJ 4220 10.4 light-years
- HIP 107948 11.9 light-years
- PSO J329.8288+03.0840 12.1 light-years
- HIP 109807 12.7 light-years
- HIP 108940 13.7 light-years
- HIP 106825 14.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.