Selasia (world)

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

Selasia/Alasim (Halcyon 0436)
Classic Era (1115)
StarportA Excellent: Starship Construction, Overhaul, Refined fuel
Size8 Large (12,800 km, 0.80g - 1.08g)
Atmosphere7 Standard (tainted)
HydrographicsA Water World 100%
Population8 Moderate (800 million)
Government8 Civil Service Bureaucracy
Law7 Moderate Law (no firearms)
Tech LevelC Average Stellar (robots)
See also UWP
System Details
Primary G3 V
Planetoid Belts 1
Gas Giants 4
Jump map from [1]

Selasia is a preindustrial, moderate population water world with over a hundred million, but not yet at a billion sophonts in population size.

  • Its surface is 90% or more covered in an ocean of water.
  • The inhabitants of this world live on the roughly 10% of exposed land mass, in underwater colonies, on city ships, or similar arrangements.
  • As a preindustrial world, this planet cannot yet manufacture enough high-technology resources to support a modern, star-faring society. Having to import most manufactured and high tech goods drives the price up for these items at this world.
  • This a "high technology" world with technology achievements at, near, or over technology standards for Charted Space.
  • It is a member of the Bright Conclave in the Alasim Subsector of Halcyon Sector, which is part of the Distant Fringe.
  • This world-system hosts a Military Base, usually associated with military ground forces, which may be located on or off-world.

Description (Astrography & Planetology)[edit]

A world in Halcyon Sector in the Distant Fringe.

Monostellar System[edit]

Selasia Monostellar System
Star Name Hierarchy Color Classification Remarks
Selasia Primary Yellow G3 V None

System Data[edit]

Monsado-Selasia System[edit]

The primary is Monsado, an ordinary yellow main sequence star. It has a luminosity of 0.886 Sols, a mass of 0.98 Sols, and a diameter of 1.391 million km. The inner system consists of (I) a vacuum inner world, and (II) a vacuum worldlet. (III) Selasia orbits within the habitable zone and is designated the mainworld. (IV) a large gas giant, (V) a ringed large gas giant, (VI) a sparse icy planetoid belt, (VII) a small gas giant, (VIII) a small ice giant, (IX) a trace atmosphere worldlet, (X) an exotic atmosphere stormworld, and (XI) a vacuum worldlet form the outer system. Most of the worlds retain satellites.

Mainworld Data[edit]

(III) Selasia[edit]

(III) Selasia is designated the mainworld. It orbits Monsado at a mean distance of 0.78 AU (116.7 million km), within the habitable zone. It has an orbital period of 254 days 4 hours and a rotation period of 31 hours. The axial tilt is 11 degrees. Selasia has a diameter of 13,120 km, a density of 5.72 g/cm³, and a surface gravity of 1.06 G. The world is geologically active. Its atmosphere is rated as Standard, Tainted, with a mean surface pressure of 1.14 bar and a composition of 72% nitrogen (N2), 27% oxygen (O2), and 1% argon (Ar), water vapor (H2O), carbon dioxide (CO2), ozone (O3), neon (Ne) and other trace gases. The taint is caused by an extremely unpleasant odor of organic origin. Selasia is a water world: approximately 97% of the surface is covered in oceans of liquid water: average tidal ranges exceed 0.75m. Mean surface temperature: 3°C. The climate is rated as Temperate-Cool and experiences very minor seasonal changes during the local year. The atmosphere is dynamic and strong weather systems driven by the star and the seas sweep across the globe.


Selasia retains a single natural satellite, a very thin atmosphere hospitable world named Taffar:

(IIIa) Taffar (UWP F633668-B, orbiting at 8 Diameters/102,000 km)

Mainworld Geography and Topography[edit]

Total surface area: 541 million km², Water surface area: 525 million km², Land surface area: 16 million km². Selasia is almost entirely covered in a world-ocean of liquid water. The land area is made up of scattered islands and isolated archipelagos, largely of volcanic origin. Only a relatively small part of that available land surface is desirable: some islands are environmentally hostile, some have difficult terrain such as mountains, some are geologically active, and many areas of "land" are subject to Selasia's extreme tides and regularly flood. In total, the usable surface area of the world is considered to be somewhere around 7 million km². Both poles have small icecaps.

Native Lifeforms[edit]

Monsado-Selasia System[edit]

Selasia, the mainworld, has extensive, abundant native life, with complex organisms inhabiting every ecological niche. Their metabolic functions drive the process of atmospheric renewal.

  • Taffar, Selasia's temperate hospitable moon has extensive, abundant native life, with complex organisms inhabiting every ecological niche. Their metabolic functions drive the process of atmospheric renewal.

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

History & Background (Dossier)[edit]

World starport[edit]

Selasia has an excellent quality starport.

  • A Class A Starport Facility has very well developed shipyards and is capable of producing first rate starships.
  • This facility has many very skilled personnel who can perform not only major repair work, but overhaul work as well.
  • This facility has advanced refueling and refining infrastructure. One may purchase practically any kind of refined fuel here.
  • Almost every starport of this class possesses both a Lowport and a Highport. Sometimes multiple ports of each type.
  • Peace footing (government modifier x1.1). Port Capacity: 880,000 dTons


Port facilities within the system include:

World technology level[edit]

Selasia possesses a Technology Level of TL–12 or TL-C in Hexadecimal Notation.

World government[edit]

Selasia has a Civil Service Bureaucracy government.

  • It is a government by agencies employing individuals selected for their expertise.
  • The typical power source of this government is an Oligarchy.
  • The typical power structure of this government is a Unitary State.

World military[edit]

No information yet available.

World economy[edit]

No information yet available.

Trade data[edit]

A number of important companies have their headquarters at Selasia:

World demographics[edit]

Population: 800,000,000

World culture[edit]

  • Homogeneity: D (Fragmented)
  • Acceptance: A (Very friendly)
  • Strangeness: 5
  • Symbols: F

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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  1. "Jump Map API" and map location from