Thatmo

Thatmo
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
↑ 1.0 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

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.

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

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