Star · K0V
GJ 9657B
GJ 9657B is a main-sequence star of spectral type K0V in the constellation Sagittarius, 275.4 light-years from the Sun.
| Constellation | Sagittarius |
|---|---|
| Distance | 275.4 light-years (84.4 pc) |
| Apparent magnitude | magnitude 8.69 |
| Absolute magnitude | magnitude 4.06 |
| Spectral type | K0V |
| Surface temperature | 5,110 K |
| Luminosity | 2.68 L☉ |
| Radius | 2.09 R☉ |
| Mass | 1.28 M☉ (estimated) |
| Right ascension (J2000) | 19h 29m 52.5s |
| Declination (J2000) | −26° 59′ 14″ |
| Space velocity (relative to the Sun) | 35.9 km/s |
In the sky
Too faint for the naked eye (magnitude 8.69); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 63° N. South of latitude 63° S it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1751. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.9 million years.
The Sun seen from there
From a planet around GJ 9657B, the Sun would look like a star of magnitude 9.46, in the direction where our sky has the constellation Gemini. 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.