Slate thumn
Slate as seen from orbit.
Moon of Sarnus
Orbital Characteristics
Semi-major axis 42 592 946 m [Note 1]
Apoapsis 44 296 664 m [Note 1]
Periapsis 40 889 228 m [Note 1]
Orbital eccentricity 0.04
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
Physical Characteristics
Equatorial radius 540 000 m
Equatorial Circumference 3 392 920 m
Surface area 3.6643537×1012 m2
Mass 3.0241165×1022 kg
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]
Atmospheric Characteristics
Atmosphere present × No
Scientific multiplier
Surface 11.5
Near space 10.5
Outer space 10

  1. 1.0 1.1 1.2 1.3 The distances are given from the bodies center not surface (unlike ingame)

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.

In-Game Description

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

Physical Characteristics

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.

Biome list

Slate Biome Map

Slate biome map

  • Poles
  • Robau Bay
  • Northern Sea
  • Southern Sea
  • Northern Islands
  • Southern Islands
  • Mount Nehelennia
  • Yahel Mountains
  • Sombor Mountains
  • Muil Hills
  • Gorgoroth Plateau
  • Orodruin Chaos
  • Dagorlad Region
  • Augustus Valley
  • Tygoo Valley
  • Impact Craters

Reference Frames

Warp Minimum Altitude
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

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