Seich (world)

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

Seich/Velous (Far Home 1512)
Classic Era (1115)
StarportB Good: Spacecraft Construction, Overhaul, Refined fuel
Size2 Small (3,200 km, 0.10g - 0.17g)
Atmosphere0 Vacuum
Hydrographics0 Desert World 0%
Population6 Moderate (5 million)
Government6 Captive Government/Colony
Law8 High Law (controlled blades)
Tech LevelA Early Stellar (jump drive)
See also UWP
System Details
Primary M3 V M7 VI D
Planetoid Belts 2
Gas Giants 1
Jump map from [1]

Seich is a non-agricultural and nonindustrial vacuum world, which warrants hazardous environment precautions.

  • Life in a vacuum requires great discipline. After all, it only takes one forgotten seal on a vacuum suit to spell death. Those who survive tend to be very methodically-minded and attentive to small detail.
  • It requires extensive imports of outside technology to maintain a modern, star-faring society.
  • It is unable to produce quality foodstuffs and must import them.
  • It has few prospects for economic development.
  • It is a Non-Aligned world dominated by human sophonts located in the Velous Subsector of Far Home Sector.
  • This world-system hosts a Military Base, usually associated with military ground forces, which may be located on or off-world.
  • This world is controlled by Dhon

Astrography and Planetology[edit]

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

Trinary Solar System[edit]

Seich Trinary Star System
Star Name Hierarchy Color Classification Remarks
Seich Primary Primary Red M3 V
Seich Companion Secondary Red M7 VI 18500 AU from primary
Seich Far Companion Tertiary White Dwarf D 5.35 AU from secondary

System Data[edit]

Astor-Seich System[edit]

The primary is Astor, 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 very thin atmosphere radworld, (II) a trace atmosphere radworld, (III) Ditter, an exotic atmosphere bigworld: (IIIa) Seich is its only satellite and is designated the mainworld, (IV-I) a large gas giant, and (IV-II) a vacuum iceworld form the outer system. Many of the worlds retain satellites.

Namsal Subsystem[edit]

The companion is Namsal, a dim red subdwarf star that orbits Astor at a mean distance of 5.35 AU (orbital position (VII), 800.4 million km) and has an orbital period of 19 years 259 days. It has a luminosity of 0.00103 Sols, a mass of 0.081 Sols, and a diameter of 109,000 km. (I) a trace atmosphere worldlet, (II) a vacuum worldlet, and (III) a vacuum iceworld form the outer system. All of the worlds retain small satellites.

Gelum Subsystem[edit]

The far companion is Gelum, a tiny dwarf star lying approximately 18,500 AU from Astor and Namsal. It has a luminosity of 0.00003 Sols, a mass of 1.11 Sols, and a diameter of 8,450 km. (I) a vacuum iceworld, and (II) a dense icy planetoid belt form the outer system. The iceworld does not retain satellites.

(III) Ditter[edit]

(III) Ditter (UWP YDA0000-0) is designated a bigworld. It orbits Astor at a mean distance of 0.73 AU (109.2 million km), within the habitable zone. It has an orbital period of 362 days 20 hours and a rotation period of 43 hours. The axial tilt is 22 degrees. Ditter has a diameter of 21,344 km, a density of 5.37 g/cm³, and a surface gravity of 1.63 G. The world is geologically very active. Its atmosphere is rated as Exotic, with a mean surface pressure of 3.31 bar and a composition of 88% nitrogen (N2), 10% carbon dioxide (CO2), 1% argon (Ar), and 1% abiotic oxygen (O2), water vapor (H2O), ozone (O3), neon (Ne) and other trace gases. The world has no hydrosphere. Mean surface temperature: -153°C. The climate is rated as Frigid and experiences moderate seasonal changes during the local year. The atmosphere is dynamic and strong weather systems driven by the star surge across the globe.


Ditter retains a single natural satellite:

(IIIa) Seich (designated the mainworld, orbiting at 55 Diameters/1.15 million km)

Mainworld Data[edit]

(IIIa) Seich[edit]

(IIIa) Seich is the only major moon of (III) Ditter and is designated the mainworld. It orbits its parent world at a mean distance of 55 diameters (1.15 million km), with an orbital period of 106 days 22 hours: it is tidally locked to ditter. The axial tilt is 3 degrees relative to Ditter. Seich has a diameter of 3,526 km, a density of 4.82 g/cm³ and a surface gravity of 0.24 G. Tidal stresses generated by the gravitational pull of Ditter cause frequent geological activity. The atmosphere is rated as Vacuum. The world has no hydrosphere. Mean surface temperature: -168°C.

Mainworld Geography and Topography[edit]

Total surface area: 39 million km².

Native Lifeforms[edit]

Astor-Seich System[edit]

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

Namsal Subsystem[edit]

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

Gelum Subsystem[edit]

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

History & Background (Dossier)[edit]

No information yet available.

World starport[edit]

Seich has a good quality starport.

  • A Class B Starport Facility has not very well developed shipyards and is only capable of producing spaceships.
  • 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. Such ports rarely have more than one of each kind of port.

World technology level[edit]

Seich possesses a Technology Level of TL–10 or TL-A in Hexadecimal Notation.

World government[edit]

Seich is a Captive Government or Colony.

  • It is a government by a leadership answerable to an outside group, a colony or conquered area.
  • The typical power source of this government is an Vassal State.
  • The typical power structure of this government is a Federation .

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.

World culture[edit]

No information yet available.

Historical data[edit]

No information yet available.

World timeline[edit]

UWP listing[edit]

No information yet available.

References & Contributors / Sources[edit]

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  1. "Jump Map API" and map location from