Star · K0V
GJ 9543A
GJ 9543A is a main-sequence star of spectral type K0V in the constellation Lupus, 138.9 light-years from the Sun.
| Other names | HIP 78842 |
|---|---|
| Constellation | Lupus |
| Distance | 138.9 light-years (42.6 pc) |
| Apparent magnitude | magnitude 7.84 |
| Absolute magnitude | magnitude 4.69 |
| Spectral type | K0V |
| Surface temperature | 5,230 K |
| Luminosity | 1.42 L☉ |
| Radius | 1.46 R☉ |
| Mass | 1.09 M☉ (estimated) |
| Right ascension (J2000) | 16h 05m 39.2s |
| Declination (J2000) | −32° 51′ 44″ |
| Space velocity (relative to the Sun) | 86.5 km/s |
In the sky
Too faint for the naked eye (magnitude 7.84); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 57° N. South of latitude 57° S it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1887. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.5 million years.
The Sun seen from there
From a planet around GJ 9543A, the Sun would look like a star of magnitude 7.98, in the direction where our sky has the constellation Perseus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.