TRAPPIST-1: seven planets, and the longest year there is 19 Earth days
A year on its seven confirmed planets lasts from 1.51 to 18.77 Earth days.
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Seven known planets of one star orbit it very quickly. A short year does not imply short local days.
Each bar is one planet’s period in Earth days. The scale starts at zero; labels round to whole days.
- TRAPPIST-1 b Earth days
1.510826 · 2026-10-05
- TRAPPIST-1 c Earth days
2.421937 · 2026-10-05
- TRAPPIST-1 d Earth days
4.049219 · 2026-10-05
- TRAPPIST-1 e Earth days
6.101013 · 2026-10-05
- TRAPPIST-1 f Earth days
9.20754 · 2026-10-05
- TRAPPIST-1 g Earth days
12.352446 · 2026-10-05
- TRAPPIST-1 h Earth days
18.772866 · 2026-10-05
All pl_orbper records with exact host=TRAPPIST-1; seven unique planets, sorted by orbital period.
Current PSCompPars composite archive, snapshot 2026-10-05: parameters may be measured or derived, and parameters of one planet can use different publications. These values do not establish habitability. Acknowledge NASA Exoplanet Archive/NExScI/Caltech-IPAC under contract with NASA.
A question for this picture
How are planet sizes and orbits distributed within one system?