Star · M4V
WISE J163940.83-684738.6
WISE J163940.83-684738.6 is a main-sequence star of spectral type M4V in the constellation Triangulum Australe, 15.3 light-years from the Sun.
| Constellation | Triangulum Australe |
|---|---|
| Distance | 15.3 light-years (4.70 pc) |
| Apparent magnitude | magnitude 28.50 |
| Absolute magnitude | magnitude 30.14 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 1.38 × 10⁻⁹ L☉ |
| Radius | 1.40 × 10⁻⁴ R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 16h 39m 39.9s |
| Declination (J2000) | −68° 47′ 02″ |
| Space velocity (relative to the Sun) | 70.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 28.50. Visible from the whole Southern Hemisphere and north to latitude 21° N. South of latitude 21° 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 2011. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 272 thousand years.
The Sun seen from there
From a planet around WISE J163940.83-684738.6, the Sun would look like a star of magnitude 3.19, in the direction where our sky has the constellation Camelopardalis. 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.