Tal as seen from orbit.
Moon of Wal
Orbital Characteristics
Semi-major axis 3 109 163 m [Note 1]
Apoapsis 3 109 163 m [Note 1]
Periapsis 3 109 163 m [Note 1]
Orbital eccentricity 0
Orbital inclination 1.9 °
Argument of periapsis 0 °
Longitude of the ascending node 40 °
Mean anomaly 0 rad (at 0s UT)
Sidereal orbital period 48 866 s
2 d 1 h 34 m 25.8 s
Synodic orbital period 51352.3 s
Orbital Velocity 399.8 m/s
Longest Time Eclipsed 1856 s
Physical Characteristics
Equatorial radius 22 000 m
Equatorial Circumference 138 230 m
Surface area 6.0821234×109 m2
Mass 3.2014055×1018 kg
Standard gravitational parameter 2.1366436×108 m3/s2
Density 71 776.789 kg/m3
Surface gravity 0.441 m/s2 (0.045 g)
Escape velocity 139.37 m/s
Sidereal rotation period 48 866.138 s
2 d 1 h 34 m 26.1 s
Sidereal rotational velocity 2.8287 m/s
Synchronous orbit 212.67 km
Sphere of influence 139 966.65 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)

Tal is a sub-satellite of Wal, which is a moon of Urlum. Tal is unique in that it orbits a moon of a planet of a star; the sole great-grandchild of Kerbol.

In-Game Description

Tal is what astronomer's call a sub-satellite. While generally these moons of moons are impossible due to too small spheres of influence, Wal's distant orbit from the ice giant Urlum allowed Tal to maintain a stable orbit. Tal's albedo indicates it is composed of metals, ice or both.

Kerbal Astronomical Society

Physical Properties

Tal is immediately recognizable as having a shiny, golden surface. This indicates high traces of metal, probably gold, mixed with ice.

A faint magnetic field is detected around Tal, possibly indicating either a warmed core or magnetically charged metals within the composition of the moon.

The moon is extremely dense, more so than Kerbin, which further suggests the presence of a heavy metal in its composition, like gold. Assuming this, the internal structure could be estimated: an iron core, around 2 km in radius; a rocky mantle, 2.2 km thick; and the remaining 17.6 km of its composition could be ice mixed with gold, at a ratio of roughly 35% gold, 45% ice.


Tal is the only sub-satellite seen in the game. It orbits Wal, and they both orbit Urlum.

It could be speculated, based on its visual appearance and relationship with Wal, that the two bodies were combined as one but separated by a catastrophic impact. This may explain the patch-work look of Wal and the golden color of both moons.


Tal only has a total of 2 biomes.

Biome list

Tal Biome Map

Tal biome map

  • Surface
  • Impact Basin

Reference Frames

Warp Minimum Altitude
5× 8 500 m
10× 8 500 m
50× 8 500 m
100× 20 000 m
1 000× 40 000 m
10 000× 80 000 m
100 000× 100 000 m

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