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Tylo is the third moon of Jool. It is the largest of Jool's five moons, the largest moon in the entire Kerbol System, and the largest celestial body without an atmosphere. It is Kerbal Space Program's analog for Ganymede, a moon of Jupiter.

Landing on Tylo is extremely challenging. Its gravity is similar to Kerbin's, but aerobraking is impossible, since there is no atmosphere. However, due to its large gravity well, Tylo is an ideal target for a gravity assist to enter or leave the Jool system safely and with minimal fuel consumption.

Having a spacecraft orbiting very close to the surface can give you orbit periods of about 29 minutes going about 2,170 m/s. Like the other large Joolian moons, Tylo is tidally locked. Synchronous orbits around Tylo are not possible, as they would lie outside of its SOI, at a radius of 14,758,067 meters.


Tylo has a rocky surface. It has a varying elevation between 0 meters (Tylo baseline height) and peaks of more than 11290 meters.

Tylo's surface looks similar to that of Mün, but has much fewer impact craters (especially on the side facing away from Jool) and is more uneven.

Due to the coloring of the surface of Tylo, it is likely that it is covered in a rhyolite layer of rock, nickel, a little cobalt, some sort of ice and dust, spread by meteorite impacts. Although very large in comparison to other moons, it is unlikely that it is a captured planet. For a planet of this size, Jool would have to be much larger and denser to produce a large and strong enough gravitational well. It is a mystery why Tylo hasn't formed an atmosphere.

Because of it's high gravity and lack of an atmosphere, Tylo is very hard to land on and reach orbit from. However, low altitude orbits at high speeds can be achieved for these same reasons.

Reference Frames




  • Initial Release