Difference between revisions of "Kerbol"

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Revision as of 00:07, 26 November 2012


Kerbol (also known as Kerbin Prime, the Sun, and the Star) is the star at the center of the Kerbol system. It is orbited by five planets: Moho, Eve, Kerbin, Duna, and Jool.

Compared to our own Sun, Kerbol is 113 times less massive and has a radius 3 times smaller. Kerbol is likely a K Class main sequence star based on its temperature, but it may also be an M class star based on its radius, or a G class star based on its luminosity. It may also be a large white dwarf.

Orbiting just above the surface gives an orbital period of 409.214 Minutes and a speed of 66.945 km/s.

Reference Frames

Paid (0.17) Demo (0.13.3)
Warp Minimum Altitude
1x 0 m
2x n/a 0 m
5x 3,270,000 m 3,270,000? m
10x 3,270,000 m 6,540,000 m
50x 6,540,000m 16,350,000 m
100x 13,080,000 m 32,700,000 m
1,000x 26,160,000 m 65,400,000 m
10,000x 52,320,000 m 130,800,000 m
100,000x 65,400,000 m n/a

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


  • Between versions 0.7 and 0.10.1, Kerbol was a mere point of light in the skybox.
  • It became possible to reach Kerbol in 0.11.
  • Kerbol gained gravity in 0.12.
  • 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.
  • Since 0.14, close encounters will result in a collision that destroys the ship and kills all crew members.
  • 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 4 km/s, at the expense of drastically-increased flight time.
  • The name "Kerbol" was created by forum members and never appears in the game. In the game, the star is referred to as "the Sun".



  • Actual model added, new sprite/flare effect, size changed.
  • Added solid surface (featureless invisible plateau ~4500-4700 km above nominal radius)
  • Added Gravity, nominal radius of 65,400 km.
  • Made it possible to reach Kerbol.
  • Initial Release