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Bop as seen from orbit.
Moon of Jool
Orbital Characteristics
Semi-major axis 128 500 000 m [Note 1]
Apoapsis 158 697 500 m [Note 1]
Periapsis 98 302 500 m [Note 1]
Orbital eccentricity 0.24
Orbital inclination 15 °
Argument of periapsis 25 °
Longitude of the ascending node 10 °
Mean anomaly 0.9 rad (at 0s UT)
Sidereal orbital period 544 507 s
25 d 1 h 15 m 7.4 s
Synodic orbital period 547355.1 s
Orbital Velocity 1 167 to 1 884 m/s
Longest Time Eclipsed 10286 s
Physical Characteristics
Equatorial radius 65 000 m
Equatorial Circumference 408 407 m
Surface area 5.3092916×1010 m2
Mass 3.7261090×1019 kg
Standard gravitational parameter 2.4868349×109 m3/s2
Density 32 391.188 kg/m3
Surface gravity 0.589 m/s2 (0.06 g)
Escape velocity 276.62 m/s
Sidereal rotation period 544 507.43 s
25 d 1 h 15 m 7.4 s
Sidereal rotational velocity 0.75005 m/s
Synchronous orbit 2 588.17 km
Sphere of influence 1 221 060.9 m[Note 1]
Atmospheric Characteristics
Atmosphere present × No
Scientific multiplier
Surface 12
Near space 9
Outer space 8

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

Bop is one of the five natural satellites of Jool. It seems to be a captured asteroid and has certain similarities to Gilly, another presumably captured asteroid orbiting Eve. Bop has a large crater with a white rim. Some of its mountains rise to nearly 22 km above the surface, meaning any orbit below this could possibly impact the surface. It is comparable to Minmus in that, due to its low gravity, landing is relatively easy. This low gravity results in its bulged, irregular terrain. The brownish surface color may come from solid carbon or iron oxide within the harsh landscape.

In-game Description

Bop is a small moon in the vicinity of Jool. In Kerbal mythology, Bop is believed to be the home of the Kraken, a mischievous creature said to play with the ships of hapless explorers by spinning them out of control until torn asunder, then casting them into oblivion.

Kerbal Astronomical Society


Bop is mostly mountainous with very few flat surface areas. Due to a very low surface gravity, it is unable to achieve hydrostatic equilibrium. A noticeable feature on Bop is a very large impact crater on the northern hemisphere west to the prime meridian. The highest point on Bop is an astounding 21,758 m, marking the highest point above sea level in the Kerbol System. The point lies at 23.87° W and 64.57° N and is as high as Olympus Mons on Mars.

Like most other Kerbol bodies, excluding Minmus, the Mun and Kerbin, Bop was a single biome until version 0.90.

Spoiler: Easter Eggs Are Shown


Bop has 5 biomes.

Biome list

Bop biome map as of 1.2.1
  • Poles
  • Slopes
  • Peaks
  • Valley
  • Ridges

Reference frames

Rotational/Inertial transition 100 000 m
Warp Minimum Altitude
5× 24 500 m
10× 24 500 m
50× 24 500 m
100× 40 000 m
1 000× 60 000 m
10 000× 80 000 m
100 000× 100 000 m



  • Bop looks very similar to Gilly in color and shape.
  • In the ingame descriptions it is mentioned that Tylo was the first of Jool's moons known, discovered when Kerbals attempted to photograph Jool. However, Bop is said to exist in Kerbal mythology, implying - rather oddly - that cameras have been present on Kerbin since antiquity.


  • Added biomes
  • Semi-major axis increased to prevent SOI intersection with Tylo
  • Initial release