Polta as seen from orbit.
Moon of Urlum
Orbital Characteristics
Semi-major axis 11 727 895 m [Note 1]
Apoapsis 11 745 487 m [Note 1]
Periapsis 11 710 303 m [Note 1]
Orbital eccentricity 0
Orbital inclination 2.45 °
Argument of periapsis 60 °
Longitude of the ascending node 40 °
Mean anomaly 1.5209 rad (at 0s UT)
Sidereal orbital period 73 004 s
3 d 2 h 16 m 44.2 s
Synodic orbital period 73011.4 s
Orbital Velocity 1 008 to 1 011 m/s
Longest Time Eclipsed 4346 s
Physical Characteristics
Equatorial radius 220 000 m
Equatorial Circumference 1 382 301 m
Surface area 6.0821234×1011 m2
Mass 1.3517045×1021 kg
Standard gravitational parameter 9.0213841×1010 m3/s2
Density 30 305.756 kg/m3
Surface gravity 1.86 m/s2 (0.19 g)
Escape velocity 905.61 m/s
Sidereal rotation period 73 004.642 s
3 d 2 h 16 m 44.6 s
Sidereal rotational velocity 18.934 m/s
Synchronous orbit 2 080.76 km
Sphere of influence 1 661 114.9 m[Note 1]
Atmospheric Characteristics
Atmosphere present × No
Scientific multiplier
Surface 13
Near space 12
Outer space 11.5

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

Polta is a moon of Urlum, and shares its orbit with Priax. It is perhaps best known for its striking, swirly surface colouring of varying hues of grey, brown and turquoise. Polta has no real-world analogue.

In-Game Description

Polta's mint-colored appearance immediately reminded astronomers of Minmus, but it was quickly realized that that was still in orbit of Kerbin and this thus had to be another body. Polta's surface is made of smooth and swirling terrain forms, most likely a result of tidal heating caused by the nearby Urlum.

Kerbal Astronomical Society

Physical Properties

Polta is an icy body, with evidence of a sub-surface ocean. The green swirls of color on the surface may be made of the same material as the green gases on Tekto, which are speculated to be chlorine.

The internal structure of Polta, taken from the average density of the moon, indicate the following: An iron-nickel core with a radius of around 55 km, which internally heats the moon; a mantle of solid rock around 99 km thick; an ocean of ammonia and water about 44 km thick; and an icy surface or crust around 22 km thick.

The surface is littered with craters, and the ejected particles may contribute to the faint ring system of Urlum.


Polta shares its orbit with Priax, a smaller moon of Urlum. This unique and interesting moon system occurs nowhere else in the game. These co-orbiting moons are referred to as trojan moons, which is defined by two objects sharing the same (or mostly the same) orbit, in the same orbital plane, but never collide due to their synchronized orbital periods, with Priax's positioning at Polta's L5 Lagrangian point keeping the configuration stable. The masses of both objects are perfectly balanced to allow each their own space within the orbital plane.


Polta has a total of 11 biomes. As of OPM v2.1, biomes on Polta are currently broken.

Biome list

Polta Biome Map

Polta biome map

  • Jareth Labyrinth
  • Eidilleg Valley
  • Falcor Plains
  • Salcedo Plains
  • Arsonide Plains
  • Vultan Region
  • Artyomka Region
  • Nockmaar Foothills
  • Zuev Hills
  • Subotai Hills
  • Bray Plateau

Reference Frames

Warp Minimum Altitude
5× 4 125 m
10× 8 250 m
50× 16 500 m
100× 33 000 m
1 000× 66 000 m
10 000× 132 000 m
100 000× 264 000 m

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