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Kerbin is a planet which is home to the Space Center and the main focus of Kerbal Space Program. It has two moons, named Mun and Minmus. It is the third planet in orbit around the M class star Kerbol. It is the third largest planet after Jool and Eve, and the fourth largest celestial object around Kerbol (the moon Tylo being slightly larger).


Topographical image of Kerbin.

Kerbin has a roughly equal distribution of surface liquid water and solid land, with polar icecaps and scattered deserts. There are mountains exceeding 3km in height, with the tallest mountain at least 3750 m.[1]


Kerbin has an atmosphere of unknown composition, though because Kerbin has plants and animals, it can be assumed there is O2, N2, and CO2. The atmosphere ends at 69,077.55 meters and, as on Earth, becomes exponentially less dense as altitude increases (with a scale height of 5 km).[2] In general, the atmospheric pressure and density on Kerbin, at an altitude expressed in meters, are:


Geosynchronous orbit is achieved at an altitude of 2868.4 km above sea level. A Semi Synchronous Orbit with an orbital period of 1/2 of Kerbal (3 hours or 10800 seconds) is achieved at an orbit of 1585.4 km above sea level. The orbital velocity is 1271.4 m/s.

Interplanetary Travel

From the lowest stable orbit around Kerbin (70km), the amount of Delta-V to reach the orbits of the other celestials is as follows:

Body Delta-V
Mun ~860 m/s
Minmus ~930 m/s
Eve ~1033 m/s
Duna ~1060 m/s
Moho ~1676 m/s
Jool ~1915 m/s

Reference Frames

Paid (0.17) Demo (0.13.3)
Rotational/Inertial transition 100,000 m 70,000 m
Warp Minimum Altitude
1x Any
2x n/a 0 m
5x 69,078 m (above the atmosphere)
10x 69,078 m (above the atmosphere)
50x 120,000 m 150,000 m
100x 240,000 m 300,000 m
1,000x 480,000 m 600,000 m
10,000x 480,000 m 1,200,000 m
100,000x 600,000 m n/a



  • Between 0.7 and 0.14.1 some mountain ranges exceeded 600m in height
  • The highest point was at approximately 900m altitude.[3] In versions 0.14.2


  • Much more varied and taller terrain added.
  • Terrain overhaul, oceans became wet.
  • Atmosphere extended from ~34,500 m to ~69,000 m.
  • Initial Release


  1. [Broken Link]
  2. Forum thread 16000, "[KGSS] Examining Kerbin's atmosphere"
  3. [Broken Link]