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Revision as of 09:00, 30 August 2012 by Ilithyia (talk | contribs) (Added Moho, Eve, Duna and Jool)
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The star Kerbol shines brightly through space.

Kerbol, also known as Kerbin Prime, The Sun, and The Star is an M class red dwarf star and parent to the planets Moho, Eve, Kerbin, Duna and Jool.


  • Mass: 1.75e28 kg = 0.00880 solar masses

Reference Frames

Paid (0.15.2) Demo (0.13.3)
Warp Minimum Altitude
1x n/a
2x 0 m
5x  ? m (within kill zone?)  ? m
10x 6,540,000 m
50x 13,080,000 m 16,350,000 m
100x 26,160,000 m 32,700,000 m
1000x 52,320,000 m 65,400,000 m
10000x 65,400,000 m 130,800,000 m

All Kerbol orbits are in an inertial reference frame. Getting close enough to experience lower maximum time warps results in attacks by the Deep Space Kraken.


As of version 0.16 there is only a single orbiting planet, Kerbin. With version 0.17 four new planets will be implemented (Moho, Eve, Kerbin and Jool). Additional planets are planned for future versions.


Between versions 0.7 and 0.10.1, Kerbol was a mere point of light in the skybox. It became possible to reach in 0.11, and gained gravity in 0.12. Since 0.14, close encounters will result in a collision that destroys the ship and kills all crew members. It is still safe to drop below the "surface" in 0.13.3, but a ship can break up from the extreme gravity gradients and/or shot outwards at large fractions of c.

The current "surface" of Kerbol is an invisible and likely featureless plateau approximately 4500-4700 km above the nominal radius. There is no known way to land on it, as the Kraken makes all maneuvering difficult, and the gravity reduces the TWR of all engines below 1. One can attempt to place edited parts on the surface, but they bounce erratically at a few hundred to a few thousand m/s if they do not explode.

While Kerbol can be reached from Kerbin's orbit by using a Hohmann transfer orbit, a spacecraft doing so will require a ΔV of about 8 km/s to do so. The most efficient way to reach Kerbol from Kerbin's orbit is to use a Bi-Elliptic transfer. With a sufficiently-distant apoapsis, the required ΔV to sundive can be reduced to under 4km/s, at the expense of drastically-increased flight time.

The name "Kerbol" is created by the forum members, it never appears in the game. In the game the star is referred to as "the Sun"

See Also