|Slate as seen from orbit.|
|Moon of Sarnus|
|Semi-major axis||42 592 946 m [Note 1]|
|Apoapsis||44 296 664 m [Note 1]|
|Periapsis||40 889 228 m [Note 1]|
|Orbital inclination||2.3 °|
|Argument of periapsis||0 °|
|Longitude of the ascending node||55 °|
|Mean anomaly||1.1 rad (at 0s UT)|
|Sidereal orbital period||192 737 s|
|8 d 5 h 32 m 17.1 s|
|Synodic orbital period||192880.7 s|
|Orbital Velocity||1 334 to 1 445 m/s|
|Longest Time Eclipsed||7966 s|
|Equatorial radius||540 000 m|
|Equatorial Circumference||3 392 920 m|
|Surface area||3.6643537×1012 m2|
|Standard gravitational parameter||2.0183196×1012 m3/s2|
|Density||45 848.870 kg/m3|
|Surface gravity||6.92 m/s2 (0.706 g)|
|Escape velocity||2 734.09 m/s|
|Sidereal rotation period||192 738.24 s|
|8 d 5 h 32 m 18.2 s|
|Sidereal rotational velocity||17.604 m/s|
|Synchronous orbit||11 843.84 km|
|Sphere of influence||9 672 901.5 m[Note 1]|
|Atmosphere present||× No|
Slate is the fourth moon of Sarnus and is a rocky, atmosphere-less body with some unique features and implications. It is slightly smaller than Kerbin, with about just over 2/3 the surface gravity. Due to its mass, it is very easy to achieve an orbital encounter with Slate.
|“|| Evidence suggests that Slate had an atmosphere only a few million years ago, until an unknown cataclysm stripped the atmosphere away, leaving only a dry husk behind. It's yellow and brown colors have inspired many painters since it's discovery, including the renowned Vincent Van Kerman.|
— Kerbal Astronomical Society
Slate is not significantly smaller nor lighter than Kerbin, although it appears that the moon has been stripped of its atmosphere somewhat recently. The lack of a magnetosphere seems to suggest that the core has cooled and the atmosphere has been blown away by solar wind, drying out the moon and cooling it even more. However, the presence of apparently active volcano Mount Nehelennia implies the planet is not entirely geologically dead after all.
From the average density, it is possible to estimate the internal structure. Slate may be composed of an iron-nickel core, with a radius of about 51 km; a solid, rocky, silicate mantle about 477 km thick; and the surface crust, around 10 km thick.
The surface of the moon shows impact craters consistent with atmosphere-less moons, but also dried lakebeds and valleys consistent with a dense atmosphere, making Slate an intriguing place to visit.
Slate has a total of 16 biomes.
|5×||10 125 m|
|10×||20 250 m|
|50×||40 500 m|
|100×||81 000 m|
|1 000×||162 000 m|
|10 000×||324 000 m|
|100 000×||648 000 m|