Star · ?
GJ 2154B
GJ 2154B is a main-sequence star of spectral type ? in the constellation Aquarius, 68.7 light-years from the Sun.
| Constellation | Aquarius |
|---|---|
| Distance | 68.7 light-years (21.1 pc) |
| Apparent magnitude | magnitude 13.80 |
| Absolute magnitude | magnitude 12.18 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.00517 L☉ |
| Radius | 0.18 R☉ |
| Mass | 0.192 M☉ (estimated) |
| Right ascension (J2000) | 23h 14m 12.2s |
| Declination (J2000) | −19° 38′ 50″ |
| Space velocity (relative to the Sun) | 45.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.80. Visible from the whole Southern Hemisphere and north to latitude 70° N. South of latitude 70° S it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1957. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
The Sun seen from there
From a planet around GJ 2154B, the Sun would look like a star of magnitude 6.45, in the direction where our sky has the constellation Leo. It would be visible 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.