Blass (world)

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

Blass/Utt (Halcyon 1333)
Classic Era (1115)
StarportA Excellent: Starship Construction, Overhaul, Refined fuel
Size7 Medium (11,200 km, 0.70g - 0.94g)
Atmosphere7 Standard (tainted)
Hydrographics8 Wet World 80%
Population7 Moderate (80 million)
Government5 Feudal Technocracy
Law5 Moderate Law (no concealable weapons)
Tech LevelB Average Stellar (large starships)
See also UWP
System Details
Primary F6 V
Planetoid Belts 1
Gas Giants 4

Blass is a preindustrial, agricultural world.

  • 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]

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

Monostellar System[edit]

Blass Monostellar System
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)

F6 V

Primary Main Sequence 1.248 6000 - 6700 3.042
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.01234 0.14467 1.39 - 2.26 1.234 12.34
Orbit #  * 0 4 3 7

System Data[edit]

Tremain-Blass System[edit]

The primary is Tremain, an ordinary white main sequence star. It has a luminosity of 3.042 Sols, a mass of 1.248 Sols, and a diameter of 1.845 million km. The inner system consists of (I) a trace atmosphere inner world, (II) a vacuum inner world, (III) an exotic atmosphere stormworld, and (IV) a very thin atmosphere hospitable world. (V) Blass orbits within the habitable zone and is designated the mainworld. (VI) a ringed small gas giant, (VII) a ringed small ice giant, (VIII) a sparse rocky planetoid belt, (IX) a ringed large gas giant, (X) a small gas giant, and (XI) a trace atmosphere iceworld form the outer system. Many of the worlds retain satellites.

Mainworld Data[edit]

(V) Blass[edit]

(V) Blass is designated the mainworld. It orbits Tremain at a mean distance of 1.73 AU (258.8 million km), within the habitable zone. It has an orbital period of X days XX hours and a rotation period of 19.5 hours. The axial tilt is 22 degrees. Blass has a diameter of 11,699 km, a density of 6.35 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 1.23 bar and a composition of 75% nitrogen, 24% oxygen, and 1% argon, water vapour, carbon dioxide, neon and other trace gases. The atmospheric taint is caused by the high percentage of atmospheric oxygen. Approximately 84% of the surface is covered in oceans of liquid water: average tidal ranges exceed 0.3m. Mean surface temperature: 12°C. The atmosphere is active and powerful weather systems driven by the star and the oceans surge across the globe. The climate is seasonal.

Mainworld geography and topography[edit]

Total surface area: 430 million km², Water surface area: 361 million km², Land surface area: 69 million km².

Native lifeforms[edit]

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

History & Background (Dossier)[edit]

No information yet available.

World starport[edit]

Blass has a Class A Starport, an excellent quality installation which includes all the expected amenities including refined fuel for starships, brokerage services for passengers and cargo, and a variety of ship provisions. There is a shipyard capable of doing annual maintenance, overhauls and other kinds of repair, and construction of both starships and non-starships. Most ports of this classification have both a Highport and a Downport.

  • Peace footing (government modifier x0.95). Port Capacity: 76,000 dTons


Port facilities within the system include:

World technology level[edit]

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

World government[edit]

Blass is governed by a Feudal Technocracy. Society divides itself based on the technical requirements of the society. Each of these functions are granted as a fief to an individual or group. Leadership of these fiefs determines the head of the government.

World military[edit]

No information yet available.

World economy[edit]

No information yet available.

Trade data[edit]

No information yet available.

World demographics[edit]

No information yet available.


Umerglass is the capital city of Blass. It lies below the Plateau Mountains, the location of the Emerald Atrium, the Palace of the Master and various other government buildings.

World culture[edit]

No information yet available.

Historical data[edit]

The main base of operations of the Association of the Star.

World timeline[edit]

No information yet available.

UWP listing[edit]

No information yet available.

References & Contributors / Sources[edit]

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