Sena (world)

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Sena/Sena (Halcyon 1327)
Classic Era (1115)
StarportC Routine: No Construction, Major Repair, Unrefined fuel
Size4 Small (6,400 km, 0.32g - 0.46g)
Atmosphere5 Thin
Hydrographics0 Desert World 0%
Population4 Moderate (20 thousand)
Government3 Self-Perpetuating Oligarchy
Law3 Low Law (no automatic weapons)
Tech Level8 Pre-Stellar (superconductors)
See also UWP
System Details
Primary M6 III M0 V
Planetoid Belts 1
Gas Giants 2

Sena is a poor, nonindustrial desert world with no free-standing water.

  • It requires extensive imports of outside technology to maintain a modern, star-faring society. Having to import most manufactured and high tech goods drives the price up for these items at this world.
  • It is a Non-Aligned world dominated by human sophonts located in the Sena Subsector of Halcyon Sector.

Astrography and Planetology[edit]

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

Binary Solar System[edit]

Sena Binary Star System
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)


Primary Giant 7.85 2000 - 2800 2382.5
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 2.42859 4.04857 38.81 - 63.25 242.859 2428.59
Orbit # 5 6 9 12 15
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)

M0 V

Secondary Main Sequence 0.489 2800 - 3600 0.04
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.00511 0.01659 0.16 - 0.26 0.511 5.11
Orbit #  *  * 0 1 6
876 AU from primary

System Data[edit]

Igsook-Sena System[edit]

The primary is Igsook, a red giant star. It has a luminosity of 2383 Sols, a mass of 7.85 Sols, and a diameter of 363 million km – the star's corona extends out to 1.22 AU, within orbital position (IV). The inner system consists of (V) a vacuum worldlet, (VI) a vacuum inner world, (VII) a trace atmosphere inner world, (VIII) an exotic atmosphere stormworld, and (IX) a corrosive atmosphere inferno world – orbital positions (I) to (III) lie within the star and orbital position (IV) is empty. (X) a ringed small gas giant orbits within the habitable zone: Sena is its only major satellite and is designated the mainworld. Few of the worlds retain satellites.

Ushuru Subsystem[edit]

The companion is Ushuru, an ordinary red main sequence star that lies approximately 876 AU from Igsook. It has a luminosity of 0.04 Sols, a mass of 0.489 Sols, and a diameter of 764,000 km. (I) a very thin atmosphere hospitable world orbits within the habitable zone. (II) a sparse icy planetoid belt, (III) a large gas giant, and (IV) an exotic atmosphere bigworld form the outer system.

(X) Moston[edit]

(X) Moston is a ringed small gas giant that orbits Igsook at a mean distance of 41.2 AU (6.2 million km), within the habitable zone, and has an orbital period of 94 years 142 days. It has a diameter of 37,000 km and an atmosphere consisting of 92% hydrogen (H2), 8% helium (He), and less than 1% methane (CH4), carbon monoxide (CO), ammonia (NH3), water vapor (H2O) and other trace gases. It is a banded brown-tan color with high altitude white clouds. It retains a single major satellite.


Moston retains a dark ring system and a single major satellite:

(Xr) Ring System (UWP YR00000-0, extending to 2 Diameters/75,000 km)
(Xa) Sena (designated the mainworld, orbiting at 25 Diameters/925,000 km)

Mainworld Data[edit]

(Xa) Sena[edit]

(Xa) Sena is the only major moon of (X) Moston and is designated the mainworld. It orbits its parent world at a mean distance of 25 diameters (925,000 km), with an orbital period of 129 days 12 hours: it is tidally locked to Moston. The axial tilt is 3 degrees relative to Moston. Sena has a diameter of 6,273 km, a density of 4.95 g/cm³ and a surface gravity of 0.44 G. Tidal stresses generated by the gravitational pull of Moston cause regular geological activity. The atmosphere is rated as Thin, with a mean surface pressure of 0.49 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. Sena is a desert world: around 2% of the surface is covered in lakes of liquid water. Tidal ranges are negligible. Mean surface temperature: 39°C. The climate is rated as Hot and is static, with no seasonal changes during the local year. The atmosphere is slow and weak weather systems driven by the star drift across the globe.

Mainworld Geography and Topography[edit]

Total surface area: 124 million km², Land surface area: 121.5 million km², Water surface area: 2.5 million km².

Native Lifeforms[edit]

Igsook-Sena System[edit]

Sena, the mainworld, has primitive native life, consisting entirely of microscopic cyanobacteria-parallels that exist in any location where they can find even a minimal trace of water. Their metabolic functions maintain the process of atmospheric renewal.

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

Ushuru Subsystem[edit]

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

History & Background (Dossier)[edit]

No information yet available.

World starport[edit]

Sena has a Class C Starport, an average quality installation which includes amenities including unrefined fuel for starships, some brokerage services for passengers and cargo, and a variety of ship provisions. There is a shipyard capable of doing maintenance and other kinds of repair. Ports of this classification generally have only a downport, unless this is a trade port or system with an hostile environment mainworld.

World technology level[edit]

Sena possesses a Technology Level of TL–8.

  • Common Communication technologies for this TL include: Fiber optics, improved telephones, and satellite communication and data networks.
  • Common Power Generation technologies for this TL include: Improved geothermal and improved batteries.
  • Common Transportation technologies for this TL include:
    • Land: Advanced automobiles.
    • Water: Triphibians and early artificial gills.
    • Air: Improved helicopters and hypersonic jets.
    • Space: Space shuttles, early space stations, and improved interplanetary spacecraft (System Craft).

World government[edit]

Sena is governed by Self-Perpetuating Oligarchy. A single family or small group provides the leadership and important positions in the government. These positions are inherited by member of the group or their family members. The organization may be monarchy, with titles passed to family members. Or a plutocracy where inheritance of the family fortune includes government position. Or the organization may be more typical organization with positions of power inherited.

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]

No information yet available.

UWP listing[edit]

No information yet available.

References & Contributors / Sources[edit]

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