PLANETARY SYSTEM
TRAPPIST-1
7 confirmed planets in our catalogue, 40.5 light-years from Earth.
TRAPPIST-1 / ORBITAL ORDERIllustrative · not to scale
TRAPPIST-1Ultra-cool red dwarf
TRAPPIST-1 b1.51 daysTRAPPIST-1 c2.42 daysTRAPPIST-1 d4.05 daysTRAPPIST-1 e6.1 daysTRAPPIST-1 f9.21 daysTRAPPIST-1 g12.35 daysTRAPPIST-1 h18.77 days e, f & g: commonly discussed habitable-zone worlds
A suitable atmosphere would still be needed for surface liquid water. Their actual surface conditions are not shown.
Ordered by orbital period where known. Diagram is illustrative; distances and planet sizes are not to scale.
| World / host star | Type | Distance | Year length | Discovery |
|---|---|---|---|---|
| TRAPPIST-1 b ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 1.511 days | 2016Transit |
| TRAPPIST-1 c ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 2.422 days | 2016Transit |
| TRAPPIST-1 d ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 4.049 days | 2016Transit |
| TRAPPIST-1 e ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 6.101 days | 2017Transit |
| TRAPPIST-1 f ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 9.208 days | 2017Transit |
| TRAPPIST-1 g ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 12.352 days | 2017Transit |
| TRAPPIST-1 h ↗TRAPPIST-1 | Rocky-size | 40.5 ly | 18.773 days | 2017Transit |
System discovery history
2016 · TRAPPIST-1 b · Transit
2016 · TRAPPIST-1 c · Transit
2016 · TRAPPIST-1 d · Transit
2017 · TRAPPIST-1 e · Transit
2017 · TRAPPIST-1 f · Transit
2017 · TRAPPIST-1 g · Transit
2017 · TRAPPIST-1 h · Transit