Sedulan (world)

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

Sedulan/Cradle (Halcyon 1008)
Classic Era (1115)
StarportC Routine: No Construction, Major Repair, Unrefined fuel
Size9 Large (14,400 km, 1.03g - 1.33g)
Atmosphere7 Standard (tainted)
HydrographicsA Water World 100%
Population9 High (3 billion)
Government8 Civil Service Bureaucracy
Law9 High Law (no weapons out of home)
Tech LevelB Average Stellar (large starships)
See also UWP
System Details
Primary F2 V
Planetoid Belts 0
Gas Giants 2
Jump map from [1]

Sedulan is a high-population, industrial water world, which has 90% or more of its surface covered in an ocean of water and a billion or more sophonts in population size.

  • The inhabitants of this world live on the roughly 10% of exposed land mass, in underwater colonies, on city ships, or similar arrangements.
  • As an industrial world, this planet has well-developed manufacturing and processing industries. Manufactured goods are a major export item.
  • Its economy is rapidly growing and living conditions are expected to rapidly improve barring outside forces.
  • It is a member of the Unity of Sed in the Cradle Subsector of Halcyon Sector, which is part of the Distant Fringe.

Astrography and Planetology[edit]

Monostellar System[edit]

Sedulan Monostellar System
Star Name Hierarchy Color Classification Remarks
Sedulan Primary Yellow-White F2 V

System Data[edit]

Quillan-Sedulan System[edit]

The primary is Quilan, an ordinary white main sequence star. It has a luminosity of 6.26 Sols, a mass of 1.54 Sols and a diameter of 2.198 million km. The inner system consists of (I) a vacuum worldlet, (II), a vacuum worldlet, (III) a trace atmosphere inner world, and (IV) Sedulan, designated the mainworld. (V) an exotic atmosphere bigworld orbits within the habitable zone. (VII) a large gas giant, (VIII) a large gas giant, (IX-I) a vacuum iceworld, (IX-II) an exotic atmosphere bigworld, and (X) a vacuum iceworld form the outer system – orbital position (VI) is empty. Many of the worlds retain satellites.

Mainworld Data[edit]

(IV) Sedulan[edit]

(IV) Sedulan is designated the mainworld and orbits Quilan at a mean distance of 1.13 AU (169 million km), within the within the H– region of the inner system. It has an orbital period of 353 days 13 hours and a rotation period of 44.75 hours. The axial tilt is 16.5 degrees. Sedulan has a diameter of 15,160 km, a density of 5.20 g/cm³, and a surface gravity of 1.11 G. Its atmosphere is rated as Standard, Tainted, with a mean surface pressure of 1.35 bar and a composition of 78% nitrogen (N2), 21% oxygen (O2), and 1% argon (Ar), water vapor (H2O), carbon dioxide (CO2), neon (Ne) and other trace gases. The taint is caused by pollution of industrial origin. Approximately 99.9% of the surface is covered in oceans of liquid water: average tidal ranges exceed 1.5m. Mean surface temperature: 30°C. The atmosphere is dynamic and powerful weather systems, driven by the star and the warm oceans, sweep across the globe. The climate is seasonal and weather patterns follow regular cycles during the local year.


Sedulan retains two natural satellites, a very thin atmosphere worldlet named Paradin and a thin atmosphere desert moon named Gerasta:

(IVa) Paradin (UWP F330315-A, orbiting at 13 Diameters/197,000 km)
(IVb) Gerasta (UWP F640269-A, orbiting at 30 Diameters/455,000 km).

Mainworld Geography and Topography[edit]

Total surface area: 722 million km², Land surface area: 7 million km², Water surface area: 715 million km².

Native Lifeforms[edit]

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

  • Paradin, Sedulan's hot small inner moon, has primitive native life, consisting entirely of microscopic cyanobacteria-parallels that exist in any location where they can find even a minimal trace of shelter and moisture. Their metabolic functions maintain the process of atmospheric renewal.
  • Gerasta, Sedulan's hot, marginally hospitable desert outer moon, has extensive native life, consisting of minute multicellular organisms that can be found in most ecological niches. Their metabolic functions drive the process of atmospheric renewal.

History & Background (Dossier)[edit]

World starport[edit]

Sedulan has a routine quality starport.

  • A Class-C Starport Facility has minimal if any shipyards and can only perform extremely limited repair work.
  • This facility has many very skilled personnel who can perform surprisingly sophisticated repair work despite the limited facilities.
  • This facility has refueling infrastructure and limited refining capabilities. One may purchase unrefined fuel here.
  • Starports of this class rarely have both a Lowport and a Highport.

World technology level[edit]

Sedulan possesses a Technology Level of TL–11 or TL-B in Hexadecimal Notation.

World government[edit]

Sedulan 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]

Local Defense Forces (approximately 13 million personnel).

Unity of Sed militia forces (approximately 100 million personnel).

World Economy[edit]

  • Resources: 8 (Moderate)
  • Labor: 8 (Hundreds of millions)
  • Infrastructure: A (Extensive)
  • Efficiency: −4 (Very poor)

Trade Data[edit]

No information yet available.

World Demographics[edit]

Population: 3,266,000,000

  • Native Non-Human Races:
    • Hoppers: 150,000 (less than 0.01% of the population), concentrated within tightly policed hives in human communities.
    • Temelik: 3,000 (less than 0.01% of the population), generally in hiding.

World Culture[edit]

  • Homogeneity: B (Discordant)
  • Acceptance: D (Very Xenophilic)
  • Strangeness: A (Incomprehensible)
  • Symbols: F (Extremely abstract)

Historical Data[edit]

Until 5571AD the world was known as Corolis.

World timeline[edit]

No information yet available.

UWP listing[edit]

No information yet available.

References & Contributors / Sources[edit]

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