TRAPPIST-1, also designated as 2MASS J23062928-0502285, is an ultra-cool red dwarf star that is slightly larger, but much more massive, than the planet Jupiter; it is located 39.6 light-years from the Sun in the constellation Aquarius.

Distance to Earth: 39.46 light years

Mass: 1.77 × 10^29 kg (0.089 M☉)

Luminosity (visual, LV): 0.00000373 L_☉

Luminosity (bolometric): 0.000522±0.000019 L_☉

Rotational velocity (v sin i): 6 km/s

Did you know: In the fall of 2016, Spitzer observed TRAPPIST-1 nearly continuously for 500 hours.