Ssihaa (world)

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

Ssihaa/As'Kaa (Course 0834)
Classic Era (1115)
Starport? Error in Starport Decode
Size3 Small (4,800 km, 0.24g - 0.34g)
Atmosphere2 Vacuum (very thin - tainted)
Hydrographics2 Dry World 20%
Population? Error in Population Decode
Government? Error in Government Decode
Law? Error in Law Decode
Tech Level? Error in Tech Decode
See also UWP
System Details
Primary M2 III M2 V
Planetoid Belts 1
Gas Giants 3
Jump map from [1]

Aasa'tha is a hellworld with a population struggling to survive in an inhospitable environment.

  • Hellworlds often offer daily, and sometimes even hourly, life-threatening situations to their inhabitants. Survivors often form intense survival skills and tend to be grim realists.
  • It is a part of the Sath Exploration program in the As'Kaa Subsector of Course Sector, which is part of the Distant Fringe.

Astrography and Planetology

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

Binary Solar System

Ssihaa Binary Star System
Star Name Hierarchy Color Classification Remarks
Ssihaa Primary Primary Red M2 III None
Ssihaa Companion Secondary Red M2 V 780 AU from primary

System Data

H'ssakth System

The primary is H'ssakth, a red giant star. It has a luminosity of 1194 Sols, a mass of 6.74 Sols, and a diameter of 179.49 million km – the corona of the star extends to 0.6 AU, within orbital position (III). The inner system consists of (V) a vacuum worldlet, (VI) a trace atmosphere inner world, (VII) a corrosive atmosphere inferno world, and (VIII) a dense stony planetoid belt – orbital positions (I) and (II) lie within the star and orbital positions (III) and (IV) are empty. (IX) a ringed large gas giant orbits within the habitable zone. (X-I) a small gas giant, and (X-II) an corrosive atmosphere bigworld form the outer system. Many of the worlds retain satellites

K'thaa-Ssihka Subsystem

The companion is K'thaa, an ordinary red main sequence star lying approximately 780 AU from H'ssakth. It has a luminosity of 0.0268 Sols, a mass of 0.4258 Sols, and a diameter of 658,000 km. (I) Ssihaa, designated the mainworld, (II) a very thin atmosphere radworld, (III) an exotic atmosphere bigworld, and (IV) a small ice giant form the outer system. Most of the worlds retain satellites.

  • The star experiences periodic flare activity.

Mainworld Data

(I) Ssihaa

(I) Ssihaa is designated the mainworld. It orbits K'thaa at a mean distance of 0.16 AU (23.9 million km), within the habitable zone. It has an orbital period of 34 days 18 hours: it is tidally locked to K'thaa. The axial tilt is 0 degrees. Ssihaa has a diameter of 4,699 km, a density of 5.21 g/cm³, and a surface gravity of 0.35 G. Tidal stresses generated by the gravitational pull of K'thaa cause frequent geological activity. Its atmosphere is rated as Very Thin, Tainted, with a mean surface pressure of 0.18 bar and a composition of 87% nitrogen (N2), 11% abiotic oxygen (O2), 1% argon (Ar), and 1% carbon dioxide (CO2), water vapor (H2O), ozone (O3), neon (Ne) and other trace gases. The taint is caused by the very low percentage of atmospheric oxygen and the relatively high levels of background radiation: emission rates exceed 3 rads per hour. Approximately 21% of the surface is covered in sheets of water ice and lakes of liquid water. Mean surface temperature: -3°C. The climate is rated as Cold and is static, with no seasonal changes during the local year. The atmosphere is sluggish and weak weather systems driven by the star drift across the globe.

Mainworld Geography and Topography

Total surface area: 69 million km², Land surface area: 55 million km², Water surface area: 14 million km².

  • The oxygen in the atmosphere is abiotic in origin, produced by the photocatalytic reaction between UV energy radiating from the star and titanium dioxide (TiO2), which is found in surface minerals such as ilmenite.
  • Ssihaa is a Twilight Zone World.
  • The world experiences libration, which causes the star to move in the sky and periodically rise and fall above the horizon in the twilight region.

Native Lifeforms

H'ssakth System

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

K'thaa-Ssihka Subsystem

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

History & Background (Dossier)

No information yet available.

World starport

No information yet available.

World technology level

No information yet available.

World government

No information yet available.

World military

No information yet available.

World economy

No information yet available.

Trade data

No information yet available.

World demographics

No information yet available.

World culture

No information yet available.

Historical data

No information yet available.

World timeline

No information yet available.

UWP listing

No information yet available.

References & Contributors / Sources

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  1. "Jump Map API" and map location from