Star · M1
GJ 9722
GJ 9722 is a main-sequence star of spectral type M1 in the constellation Cepheus, 78.9 light-years from the Sun.
| Constellation | Cepheus |
|---|---|
| Distance | 78.9 light-years (24.2 pc) |
| Apparent magnitude | magnitude 13.30 |
| Absolute magnitude | magnitude 11.38 |
| Spectral type | M1 |
| Surface temperature | 3,720 K |
| Luminosity | 0.00975 L☉ |
| Radius | 0.238 R☉ |
| Mass | 0.253 M☉ (estimated) |
| Right ascension (J2000) | 21h 07m 56.3s |
| Declination (J2000) | +59° 42′ 44″ |
| Space velocity (relative to the Sun) | 354.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.30. Visible from the whole Northern Hemisphere and south to latitude 30° S. North of latitude 30° 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 1947. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around GJ 9722, the Sun would look like a star of magnitude 6.75, in the direction where our sky has the constellation Carina. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 106400 5.95 light-years
- GJ 4156 6.10 light-years
- WISE J204356.42+622048.9 8.91 light-years
- GJ 4151 9.42 light-years
- GJ 4167 10.7 light-years
- HIP 102300 11.3 light-years
- WISEA J205921.85+662725.2 11.4 light-years
- GJ 4258A 12.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.