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Thatmo
Thatmo thumn
Thatmo as seen from orbit.
Moon of Neidon
Orbital Characteristics
Semi-major axis 32 300 895 m [Note 1]
Apoapsis 32 314 784 m [Note 1]
Periapsis 32 287 006 m [Note 1]
Orbital eccentricity 0
Orbital inclination 161.1 °
Argument of periapsis 0 °
Longitude of the ascending node 66 °
Mean anomaly 2.047 rad (at 0s UT)
Sidereal orbital period 306 443 s
14 d 1 h 7 m 22.7 s
Synodic orbital period 306504.5 s
Orbital Velocity 662 to 663 m/s
Longest Time Eclipsed 6486 s
Physical Characteristics
Equatorial radius 286 000 m
Equatorial Circumference 1 796 991 m
Surface area 1.0278789×1012 m2
Mass 2.7883630×1021 kg
Standard gravitational parameter 1.8609758×1011 m3/s2
Density 28 455.263 kg/m3
Surface gravity 2.28 m/s2 (0.232 g)
Escape velocity 1 140.78 m/s
Sidereal rotation period 306 442.67 s
14 d 1 h 7 m 22.7 s
Sidereal rotational velocity 5.8640 m/s
Synchronous orbit 7 335.25 km
Sphere of influence 5 709 379.1 m [Note 1]
Atmospheric Characteristics
Atmosphere present ✓ Yes
Atmospheric Pressure 1.01325 kPa
0.01 atm
Scale height  m
Atmospheric height 35 000 m
1.0×10-8 atm
Temperaturemin -221.20 °C 51.95 K
Temperaturemax -200 °C 73.15 K
Oxygen present × No
Scientific multiplier
Surface 11.5
Splashed N/A
Lower atmosphere 9.5
Upper atmosphere 11
Near space 11
Outer space 10
Recovery 10

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

Thatmo is the first moon of Neidon. It is the Triton analog to the game and has a thin atmosphere. Its inclined, uniquely retrograde orbit makes reaching the moon challenging, especially when transferring from Neidon's other moon, Nissee.

In-Game Description

This icy moon was found to have a very thin atmosphere, just thick enough to support aerodynamic flight. It has been the number one destination on every daredevil aviator's bucket list ever since. Oh, and it rotates in the opposite direction around its planet as every other moon. Quite the strange moon indeed.

Kerbal Astronomical Society

Atmosphere

Thatmo has a very thin, freezing atmosphere extending up to 35km ASL, barely enough to register as an atmosphere. While present and just about able to slow craft down before reaching the surface, parachutes cannot be deployed in the near-vacuum; the sea level pressure of which is just over a seventh of Duna's but over five hundred times the pressure found on real-life Triton and similar to that in the lowest elevations of Mars.

Altitude (m) Pressure (Pa) Pressure (atm)
0 1 013 0.010
2 500 693.6 0.006
5 000 449.4 0.004
7 500 286.9 0.003
10 000 182.8 0.002
15 000 71.77 0.001
20 000 29.54 0.000
25 000 13.82 0.000
30 000 6.905 0.000
35 000 0 0.000

Composition

Given its real-life analogue and the very low temperature, it can be assumed that Thatmo's atmosphere is largely nitrogen, as most other gases would either not be dense enough to form a substantial atmosphere or would freeze solid in the extreme cold-Thatmo's ice is presumably similar to its Tritonian counterpart in that it adopts a structure allowing it to sublime into gas at very low temperatures. Atmosphere analysis reports suggest mainly nitrogen and some ammonia and halogens (likely fluorine).

Surface

Owing to the fact that is largely ice, Thatmo's surface is mostly undulating, icy plains with some slab mountains chains stretching North-South across the frozen wastes. The surface also sports no large craters and few, if any, smaller ones, due to either Thatmo's thin atmosphere providing some protection from impacts and wearing away craters or cryovolcanic activity periodically refreshing the surface and paving them over. Various surface science reports and the wrinkled nature of the topography (suggesting tectonic activity) lend weight to the latter theory, though the effect of the atmosphere cannot be discounted.

Biomes

Thatmo has a total of 13 biomes.

Biome list

Thatmo Biome Map

Thatmo biome map

  • Kadavo Plains
  • Dathomir Plains
  • Chuchito Plains
  • Bardotta Hills
  • Serenno Hills
  • Onderon Hills
  • Rhat Highlands
  • Kell Region
  • Abafar Region
  • Ryloth Region
  • Felucia Region
  • Umbara Region
  • Cybutek Region

Reference Frames

Warp Minimum Altitude
Any
5× 35 000 m (above the atmosphere)
10× 35 000 m (above the atmosphere)
50× 35 000 m (above the atmosphere)
100× 42 900 m
1 000× 85 800 m
10 000× 171 600 m
100 000× 343 200 m