|Vall as seen from orbit.|
|Moon of Jool|
|Semi-major axis||43 152 000 m [Note 1]|
|Apoapsis||43 152 000 m [Note 1]|
|Periapsis||43 152 000 m [Note 1]|
|Orbital inclination||0 °|
|Argument of periapsis||0 °|
|Longitude of the ascending node||0 °|
|Mean anomaly||0.9 rad (at 0s UT)|
|Sidereal orbital period||105 962 s|
|1 d 5 h 26 m 2.1 s|
|Synodic orbital period||106069.5 s|
|Orbital Velocity||2558.8 m/s|
|Equatorial radius||300 000 m|
|Surface area||1.1309734×1012 m2|
|Standard gravitational parameter||2.0748150×1011 m3/s2|
|Density||27 487.852 kg/m3|
|Surface gravity||2.31 m/s2 (0.235 g)|
|Escape velocity||1 176.10 m/s|
|Sidereal rotation period||105 962.09 s|
|1 d 5 h 26 m 2.1 s|
|Sidereal rotational velocity||17.789 m/s|
|Synchronous orbit||3 593.20 km|
|Sphere of influence||2 406 401.4 m[Note 1]|
|Highest elevation||7976 m|
|Atmosphere present||× No|
Vall is the second of the five natural satellites of Jool. Like the other large Joolian moons, Laythe and Tylo (of which Vall is the smallest), Vall is tidally locked to its parent. Synchronous orbits around Vall are not possible, as they would lie outside of its SOI, at a radius of 3,893,254 meters.
Vall is KSP's analog to Jupiter's moon Europa.
Though the bodies have topical similarities, landing on Vall and returning is significantly more challenging than a landing on the Mün, due to the former's higher gravity, more uneven terrain and distance from Kerbin.
|“|| Vall was one of the last Moons of Jool to be discovered. Frustrated scientists kept trying to wipe it off the lenses of their telescopes. Eventually after a rash of returned telescopes, Advanced Optics Co. finally decided to just tell them it was an actual object in the sky.
— Kerbal Astronomical Society
Vall has an icy surface dominated by hilly lowland areas separated by mountain ridges and which ranges in elevation from 0 to 7976 m. There are almost no completely level areas, making it hard to find good landing spots.
Vall has some circular mountain ridges which could be remnants of impact craters, but they are heavily eroded, hinting that Vall has some geological activity, presumably in the form of cryovolcanism.
The surface color ranges between white and light blue. When terrain scatters are activated, large boulders with contrast-rich black and white surface patterns can be found on the surface.
|Rotational/Inertial transition||100 000 m|
|5×||24 500 m|
|10×||24 500 m|
|50×||24 500 m|
|100×||40 000 m|
|1 000×||60 000 m|
|10 000×||80 000 m|
|100 000×||100 000 m|
- According to the Tracking Station information of Vall, it was one of the last moons of Jool to be discovered. This was because the Kerbal astronomers mistook the icy moon for a smudge. After multiple failed attempts to get rid of the "smudge", they figured out it was, in fact, a moon.
- Initial Release
- Post in the forum by NovaSilisko