Which exoplanet has a year closest to Earth's?
The exoplanet with the year closest to Earth's is Kepler-1536 b, which circles its star once every 364.8 days, about 12 hours shorter than ours. Everything about Kepler-1536 b →
| # | World | Year length | Distance |
|---|---|---|---|
| ★ 1 | Kepler-1536 b | 364.8 days | 1,263 ly |
| 2 | HD 38283 b | 363.2 days | 124 ly |
| 3 | HD 96063 b | 362.5 days | 457 ly |
| 4 | HD 47366 b | 360.1 days | 275 ly |
| 5 | HD 17092 b | 359.9 days | 745 ly |
| 6 | HD 156846 b | 359.5 days | 156 ly |
| 7 | HD 4732 b | 371.7 days | 179 ly |
| 8 | Gaia-5 b | 358.6 days | 134 ly |
| 9 | HD 208897 b | 358.3 days | 220 ly |
| 10 | HD 63765 b | 358.0 days | 106 ly |
| 11 | mu Leo b | 357.8 days | 106 ly |
| 12 | HD 4313 b | 356.2 days | 445 ly |
| 13 | Kepler-1634 b | 374.9 days | 2,013 ly |
| 14 | HD 210702 b | 355.5 days | 177 ly |
| 15 | Kepler-139 f | 355.0 days | 1,275 ly |
| 16 | HD 155193 b | 352.6 days | 189 ly |
| 17 | HD 67087 b | 352.2 days | 250 ly |
| 18 | HD 142 b | 351.4 days | 85.4 ly |
| 19 | HD 73526 c | 379.1 days | 317 ly |
| 20 | HD 159868 c | 351.0 days | 182 ly |
| 21 | BD+20 2457 b | 379.6 days | 5,022 ly |
| 22 | HD 28678 b | 380.2 days | 619 ly |
| 23 | HD 212771 b | 380.7 days | 363 ly |
| 24 | alf Ari b | 380.8 days | 65.9 ly |
| 25 | HD 20868 b | 380.9 days | 156 ly |
Showing the top 25 of 5,964 that qualify.
An orbital period is among the most precise numbers in the whole catalog: a transiting planet's year is timed from one crossing of its star to the next, and a wobbling star repeats its cycle as regularly as a clock. That precision is what lets this table rank years that differ by hours, where a ranking by size or by mass would be splitting hairs finer than the measurements.
A year like ours is not a climate like ours. How warm a world is depends on its star as much as on its orbit: around a dim red dwarf a year-long orbit is frozen, and around a star brighter than the Sun it can be scorching, so the length of a year on its own says little about conditions there. Planets on orbits this long are also under-represented, because both main detection methods favour short orbits. Disputed detections are excluded.
Which exoplanet has a year closest to Earth's?
The exoplanet with the year closest to Earth's is Kepler-1536 b, which circles its star once every 364.8 days, about 12 hours shorter than ours.
Is a planet with a one-year orbit like Earth?
Not necessarily. The same year puts a planet in very different places around different stars: around a small red dwarf a one-year orbit sits a little closer in than Earth's but receives only a sliver of the light, so it is frozen, and several of the worlds on this table are gas giants with no surface at all.
Why are exoplanets with Earth-length years rare in the catalog?
Because the two main detection methods favour short orbits. A transit survey has to watch a planet cross its star more than once, which for a one-year orbit means years of continuous watching, and a star's wobble takes a full cycle to measure. Planets on year-long orbits are thought to be common; confirmed ones are not.
Which planet in our solar system has the year closest to Earth's?
Venus, whose 225-day year falls 140 days short of ours; Mars, the next nearest, takes 687 days, 322 more. The exoplanets at the top of this table come far closer than either.
Keep exploring: all records · the shortest year known · the longest year known