| Proper Name | None | | Designations | TRAPPIST-1 d, 2MASS J23062928-0502285 d, K2-112 d, EPIC 246199087 d | | Classification | Earth-mass planet | | Orbital Period | 4 days, 1 hour | | Mean Distance from TRAPPIST-1 | 3.34 million km
0.02 AU | | Mass | 0.40 x Earth | | Diameter | 0.77 x Earth | | Temperature | 288 K (15°C) | | Parent star | TRAPPIST-1, red dwarf in Aquarius | | Other planets in this system |
TRAPPIST-1 b, Earth-mass planet
TRAPPIST-1 c, Earth-mass planet
TRAPPIST-1 e, Earth-mass planet
TRAPPIST-1 f, Earth-mass planet
TRAPPIST-1 g, Earth-mass planet
TRAPPIST-1 h, Earth-mass planet | | Notes | The third of the seven known planets in orbit around the red dwarf TRAPPIST-1 in Aquarius. TRAPPIST-1 d is a low-mass terrestrial planet (it has less than half the mass of Earth, and only the outer planet TRAPPIST-1 h has a comparably low mass within its system). Like all of TRAPPIST-1's planets, TRAPPIST-1 d follows a very close, rapid orbit around its star, and so the planet's 'year' lasts a little over four days. |
Imagery provided by Aladin sky atlas
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