Star · K3
GJ 9723
GJ 9723 is a main-sequence star of spectral type K3 in the constellation Cygnus, 194.6 light-years from the Sun.
| Other names | HIP 104384 |
|---|---|
| Constellation | Cygnus |
| Distance | 194.6 light-years (59.7 pc) |
| Apparent magnitude | magnitude 10.79 |
| Absolute magnitude | magnitude 6.91 |
| Spectral type | K3 |
| Surface temperature | 4,870 K |
| Luminosity | 0.216 L☉ |
| Radius | 0.653 R☉ |
| Mass | 0.681 M☉ (estimated) |
| Right ascension (J2000) | 21h 08m 46.8s |
| Declination (J2000) | +47° 09′ 24″ |
| Space velocity (relative to the Sun) | 171.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.79. Visible from the whole Northern Hemisphere and south to latitude 43° S. North of latitude 43° 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 1831. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.5 million years.
The Sun seen from there
From a planet around GJ 9723, the Sun would look like a star of magnitude 8.71, in the direction where our sky has the constellation Vela. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 103895 15.9 light-years
- HIP 103055 17.1 light-years
- HIP 103204 18.4 light-years
- HIP 104396 18.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.