Star · M8.0 V

TRAPPIST-1

TRAPPIST-1 is a main-sequence star of spectral type M8.0 V in the constellation Aquarius, 40.7 light-years from the Sun. It is orbited by 7 confirmed exoplanet(s).

Constellation	Aquarius
Distance	40.7 light-years (12.5 pc)
Apparent magnitude	magnitude 18.65
Absolute magnitude	magnitude 18.17
Spectral type	M8.0 V
Surface temperature	2,570 K
Luminosity	5.53 × 10⁻⁴ L☉
Radius	0.119 R☉
Mass	0.0898 M☉
Age	7.6 billion years
Metallicity [Fe/H]	0.05
Right ascension (J2000)	23h 06m 30.4s
Declination (J2000)	−5° 02′ 37″
Space velocity (relative to the Sun)	82.1 km/s

In the sky

A telescope is needed to see it: its apparent magnitude is 18.65. Visible from the whole Southern Hemisphere and north to latitude 85° N. 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 1985. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 721 thousand years.

The Sun seen from there

From a planet around TRAPPIST-1, the Sun would look like a star of magnitude 5.31, in the direction where our sky has the constellation Leo. It would be visible to the naked eye.

Planets

TRAPPIST-1 b 1.51-day orbit · 1.12 R⊕
TRAPPIST-1 c 2.42-day orbit · 1.1 R⊕
TRAPPIST-1 d 4.05-day orbit · 0.788 R⊕
TRAPPIST-1 e 6.1-day orbit · 0.92 R⊕
TRAPPIST-1 f 9.21-day orbit · 1.05 R⊕
TRAPPIST-1 g 12.4-day orbit · 1.13 R⊕
TRAPPIST-1 h 18.8-day orbit · 0.755 R⊕

Neighbours

Its nearest neighbours in the catalogue (within 20 light-years):

Gl 875 7.50 light-years
2MASSW J2224438-015852 7.93 light-years
Gl 899 8.28 light-years
Gl 852B 9.58 light-years
Gl 852A 9.69 light-years
Gl 897B 9.73 light-years
GJ 4281 9.74 light-years
WISEPC J231939.13-184404.3 9.93 light-years

Open in the simulation

Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.