Geographic location of the Kerbal Space Center.

Kerbin is the home planet of the Kerbals, the location of the Space Center, and the main focus of Kerbal Space Program. It is the Earth analog for the game. It has two moons, named Mün and Minmus.

Kerbin is the third planet in orbit around the star Kerbol. It is the third largest planet (after Jool and Eve) and the fourth largest celestial object around Kerbol (with Tylo, a moon of Jool, being slightly larger).

Reaching a stable orbit around Kerbin is one of the first milestones a player might achieve in the game. Achieving such an orbit with a fuel-optimal ascent[1] requires a delta-V of ≈4500 m/s,[2] the second largest of all celestial bodies with a solid surface after Eve. For many interplanetary missions, this represents over half of the flight's total delta-V requirement.


Kerbin has a roughly equal distribution of surface liquid water and solid land, with polar icecaps and scattered deserts. There are mountains exceeding 4 km in height, with the tallest peak being just under 4044 m in altitude.

Kerbin shows signs of having been impacted by an asteroid or comet. That is visible in the large crater in the western hemisphere. The crater's central peak is visible from orbit and was caused by the compression followed by the rebound of material in the center of the crater.

Kerbal Space CenterEdit

The Kerbal Space Center is comprised of an aircraft hangar, a launch pad, the Tracking Station, a vehicle assembly building, and the spaceplane takeoff/landing strip. The Space Center is located on the eastern edge of a large peninsula shaped vaguely like South America. It is located almost on the equator, making it much easier to achieve an orbit parallel to Kerbin's orbital plane, as well as the Mun's.


It is often necessary to use moderately sized, multi-stage rockets to acquire a significant orbital altitude with large payloads or cockpits containing one or more Kerbals. These do not need to be particularly large; the default Kerbal X rocket is perfectly capable of reaching the Mün, but not necessarily capable of landing or returning in a safe manner. It is, however, possible to achieve orbit and safe reentry with a rocket of this size.

Launch of a rocket is best done following Kerbin's rotation; that is, east. This is often done by tilting the rocket to the right, if the player accepts the default orientation for the cockpit/cabin of the spacecraft. Launching with an eastward tilt lowers the orbital escape velocity of your craft.

Reentry is best done using retrograde thrusters while outside the atmosphere, and parachutes once you have reached lower altitudes. Drogue chutes may be necessary if the craft's reentry velocity is too high.


Orbital Characteristics
Semi-Major Axis 13 599 840 256 m (1)
Apoapsis 13 599 840 256 m (1)
Periapsis 13 599 840 256 m (1)
Orbital Eccentricity 0
Orbital Inclination 0 °
Argument of periapsis 0 °
Longitude of the ascending node 0 °
Mean Anomaly 3.14 rad (at 0s UT)
Siderial orbital period 9 203 545 s
426 d 0 h 32 m 24.6 s (Kerbin time)

106 d 12 h 32 m 24.6 s (Earth time)

Synodic orbital period Not defined
Orbital Velocity 9284.5 m/s
Physical Characteristics
Equatorial Radius 600 000 m
Surface Area 4.5238934×1012 m2
Mass 5.2915793×1022 kg
Gravitational Parameter 3.5316000×1012 m3/s2
Density 58 484.791 kg/m3
Surface Gravity 9.81 m/s2
Escape Velocity 3 431.03 m/s
Sidereal Rotation Period 21 600.000 s
6 h 0 m 0 s
Sidereal Rotational Velocity 174.53 m/s
Synchronous Orbit 2 868.75 km
Sphere of Influence 84 159 286 m
Highest elevation 4044 m
Atmospheric Characteristics
Atmosphere Present Yes
Atmospheric Pressure 101 kPa
1 atm
Scale Height 5000 m
Atmospheric Height 69 077.553 m
1.0×10-6 atm
Temperaturemin -40.19 °C 232.96 K
Temperaturemax 20 °C 293.15 K
Oxygen Present Yes

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