Tha'ki (world)

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This is a world-system under construction and is currently being input-programmed into the Traveller RPG Wiki.

Tha'ki/Sath (Far Home 3040)
Classic Era (1115)
StarportE Frontier - no facilities
Size4 Small (6,400 km, 0.32g - 0.46g)
Atmosphere1 Vacuum (trace)
Hydrographics1 Dry World 10%
Population0 Barren (0)
Government0 No Government structure
Law0 No Law
Tech Level0 Pre-Industrial (primitive)
See also UWP
System Details
Primary M3 V M1 VI
Planetoid Belts 0
Gas Giants 1

Tha'ki is a barren world with no overt population, government, or law level.

  • Warning: Humans are not welcome within Sath-controlled areas. Those few humans that venture into their territory are generally met with a hostile reception and are closely monitored at all times.

Astrography and Planetology[edit]

This star system is detailed using the Fringian Variant System Description.

Binary Solar System[edit]

Tha'ki Binary Star System
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)

M3 V

Primary Main Sequence 0.3942 2300 - 3100 0.02
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.00404 0.01179 0.11 - 0.18 0.404 4.04
Orbit #  *  * 0 1 6
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)


Secondary Main Sequence 0.144 2600 - 3500 0.009
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.0021 0.00796 0.08 - 0.12 0.21 2.1
Orbit #  *  * 0 4
9.71 AU from primary

System Data[edit]

Shika System[edit]

The primary is Shika, an ordinary red main sequence star. It has a luminosity of 0.0202 Sols, a mass of 0.3942 Sols, and a diameter of 604,000 km. (I) a vacuum worldlet, (II) an exotic atmosphere bigworld, (III-I) a vacuum iceworld, and (III-II) a vacuum iceworld form the outer system. Only the bigworld retains a satellite.

Khiih-Tha'ki Subsystem[edit]

The companion is Khiih, a dim red subdwarf star that orbits Shika at a mean distance of 9.71 AU (orbital position (VIII), 1.45 billion km) and has an orbital period of 48 years 70 days. It has a luminosity of 0.0092 Sols, a mass of 0.144 Sols, and a diameter of 234,000 km (I) a thin atmosphere radworld, (II) Ith'kath, a ringed large gas giant: (IIc) Tha'ki is its outer moon and is designated the mainworld, and (III) a vacuum worldlet form the outer system. Only the gas giant retains satellites.

  • The star experiences periodic flare activity.

(II) Ith'kath[edit]

(II) Ith'kath is a ringed large gas giant that orbits Khiih at a mean distance of 0.41 AU (61.3 million km), within the outer system, and has an orbital period of 152 days 18 hours. It has a diameter of 129,000 km and an atmosphere consisting of 90% hydrogen (H2), 10% helium (He), and less than 1% methane (CH4), carbon monoxide (CO), ammonia (NH3), water vapor (H2O) and other trace gases. It is a heavily banded tan-yellow color dotted with large red-brown storms. It retains a family of three major satellites.


Ith'kath retains a narrow, highly reflective ring system and three major satellites:

(IIr) Ring System (UWP YR00000-0, extending to 1 Diameter/130,000 km)
(IIa) Ith'tha (UWP Y100000-0, orbiting at 4 Diameters/515,000 km)
(IIb) Ith'ki (UWP Y4A0000-0, orbiting at 11 Diameters/1.42 million km)
(IIc) Tha'ki (designated the mainworld, orbiting at 30 Diameters/3.87 million km)

Mainworld Data[edit]

(IIc) Tha'ki[edit]

(IIc) Tha'ki is the outer of the three major moons of (II) Ith'kath and is designated the mainworld. It orbits its parent world at a mean distance of 30 diameters (3.87 million km), with an orbital period of 1 year 228 days: it is tidally locked to Ith'kath. The axial tilt is 5 degrees relative to Ith'kath. Tha'ki has a diameter of 6,022 km, a density of 3.51 g/cm³ and a surface gravity of 0.31 G. Tidal stresses generated by the gravitational pull of Ith'kath cause occasional geological activity. The atmosphere is rated as Trace, with a mean surface pressure of 0.001 bar and a composition of 83% carbon dioxide (CO2, 14% nitrogen (N2), 2% methane (CH4), 1% argon (Ar), carbon monoxide (CO), water vapor (H2O), azane (NH3), neon (Ne) and other trace gases. Approximately 8% of the surface is covered in a crust of crystalline water ice. Mean surface temperature: -114°C. The climate is rated as Frigid and is static, with no seasonal changes during the local year. The atmosphere is ethereal and weak weather systems driven by the star ghost across the globe.

Mainworld Geography and Topography[edit]

Total surface area: 113 million km², Land surface area: 104 million km², Ice crust surface area: 9 million km². The surface is heavily cratered, ridged, and made up of dust and pulverised rock built up over aeons. Geysers of liquid water, nitrogen and other trace gases are ejected from the world's interior in geologically active areas. The jets freeze as they are released but reach thousands of meters in height before falling back to the surface in huge plumes. Large areas of the surface, particularly around active vents, are covered in a dense compacted crust of water ice, while much of the rest of the surface is dusted with a fine coating of tiny crystals of water ice.

Native Lifeforms[edit]

Shika System[edit]

No world in the system is known to have native life.

Khiih-Tha'ki Subsystem[edit]

No native life is known to exist within the subsystem.

History & Background (Dossier)[edit]

No information yet available.

World starport[edit]

Tha'ki has a Class E Starport, a frontier quality installation with few expected amenities. There is unrefined fuel for starships and a limited variety of ship provisions. There is no shipyard of any kind, but there may be parts and technical support for doing minor services and repair. Ports of this classification generally consist of a downport.

World technology level[edit]

Tha'ki possesses a Technology Level of TL–0.

  • These worlds often contain a Proto-Sophont species beginning to establish a nascent civilization and society.
  • This world is in its Alpha Period and has not yet been interfered with by a higher technology civilization.
  • Common Communication technologies for this TL include: Bodily communicative apparati, courier-runners, and smoke signals.
  • Common Power Generation technologies for this TL include: Bodily muscle.
  • Common Transportation technologies for this TL include:
    • Land: Bodily locomotion, riding beasts, and litters or sedan chairs.
    • Water: Swimming, rafts, and canoes.
    • Air: Typically not available unless a bodily ability.

World government[edit]

Tha'ki has no central government for the world, an Anarchy. The largest governmental structure would be a family, tribe, or single clan. The largest group will be between 50 and 100 individuals, and there may be dozens to hundreds of them. This governmental structure can be stable over long periods of time if the population remains small or geographically separated.

World military[edit]

No information yet available.

World economy[edit]

No information yet available.

Trade data[edit]

No information yet available.

World demographics[edit]

Population: 0

World culture[edit]

  • Homogeneity: 0
  • Acceptance: 0
  • Strangeness: 0
  • Symbols: 0

Historical data[edit]

No information yet available.

World timeline[edit]

No information yet available.

UWP listing[edit]

No information yet available.

References & Contributors / Sources[edit]

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