Another satellite of Jupiter is announced, S-2017 J 1, just 3 days after the announcement of S-2016 J 1.
- Minor Planet Center
- Two of Jupiter's moons, S-2003 J 18 and S-2011 J 2 are recovered, and a small 1.5-kilometer outer moon (S-2016 J 1) is discovered, the first moon discovered around a major planet in 6 years.
- New research suggests Europa, a moon of Jupiter, may be covered in tall, jagged ice spikes, presenting a problem for any potential landing on its surface.
- Colonization of Europa
- Ten new moons are discovered around Jupiter, raising the count to 79 confirmed moons. One of these new moons, S-2016 J 2, nicknamed "Valetudo", is notable for orbiting backwards compared to the other moons in its vicinity, and may collide with one of them in the future.