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{{UWP  
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This is a [[world-system]] ''under construction'' and is currently being input-programmed into the Traveller RPG Wiki.
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{{UWP  
 
|name= {{World|Cleistra|Halcyon|Abidal|2716}}
 
|name= {{World|Cleistra|Halcyon|Abidal|2716}}
 
|system=  
 
|system=  
 
|uc    = E222000-0
 
|uc    = E222000-0
 
|popc  = 0
 
|popc  = 0
|zonec = amber
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|zonec = green
 
  |u1=  
 
  |u1=  
 
|alg    = NaHu
 
|alg    = NaHu
|class  = Ba Po / Da
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|class  = Ba Po
 
|trade  = Po
 
|trade  = Po
 
|climate = TBD
 
|climate = TBD
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}}
 
}}
 
{{World summary |name= Cleistra|trade=Ba Po}}
 
{{World summary |name= Cleistra|trade=Ba Po}}
{{World summary comment|trade=Da}}
 
 
{{World summary NaHu|sector= Halcyon|subsector=Abidal}}
 
{{World summary NaHu|sector= Halcyon|subsector=Abidal}}
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== Astrography and Planetology ==  
 
== Astrography and Planetology ==  
This [[star system]] is detailed using the [[Fringian Variant System Description]].
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No information yet available.  
* The Cleistra system lies within a "[[Jump Shoal|shoal]]" region called the "[[Cleistra Bubble]]". Travel to the system presents a considerable risk to [[starship]]s.
 
  
 
{{MonostellarSystem
 
{{MonostellarSystem
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|PrimaryNotes  =
 
|PrimaryNotes  =
 
}}
 
}}
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=== System data ===
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The primary is Sangax, a dim red main sequence star. It has a luminosity of 0.0025 Sols, a mass of 0.244 Sols and a diameter of 334,000 km. (I) Cleistra is nominated the [[mainworld]]; it and (II), an exotic atmosphere world, form the outer system. Neither world retains satellites.
  
=== System Data ===
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=== Mainworld data ===
==== Sangax-Cleistra System ====
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(I) Cleistra is designated the [[mainworld]]. It orbits Sangax at a mean distance of 0.18 AU (27 million km), it has an orbital period of 56 days 11 hours and a rotation period 49 days 16 hours. The axial tilt is 90 degrees: the worlds northern pole points towards the star and it wobbles as it rotates. Cleistra has a diameter of 3,516 km, a density of 3.97 g/cm³, and a surface gravity of 0.2 G. The tidal effects of Sangax heat the interior of the world and cause seismic activity. Its atmosphere is rated as Very Thin, Tainted, with a mean surface pressure of 0.23 bar and a composition of 65% nitrogen, 19% carbon dioxide, 15% oxygen, and 1% argon, neon and other trace gases. Approximately 19% of the surface is covered in a crust of water-ice and frozen gases, though geologically active regions may have small areas of liquid water. Mean surface temperature: -158°C. Northern polar temperature: -62°C. The atmosphere is extremely sluggish and small weather systems, driven by the star, affect northern regions of the globe. Weather patterns closely match cycles within the star.
The primary is Sangax, a dim red main sequence [[star]]. It has a luminosity of 0.0025 Sols, a mass of 0.244 Sols and a diameter of 334,000 km. (I) Cleistra, designated the [[mainworld]], and (II) an [[exotic atmosphere]] [[bigworld]] form the outer system. Neither world retains [[satellite]]s.
 
* The star experiences periodic flare activity.
 
 
 
=== Mainworld Data ===
 
==== (I) Cleistra ====
 
(I) Cleistra is designated the [[mainworld]]. It orbits Sangax at a mean distance of 0.18 AU (27 million km), it has an orbital period of 56 days 11 hours and a rotation period 49 days 16 hours. The axial tilt is 90 degrees: the world's northern pole points towards the star and it wobbles as it rotates. Cleistra has a diameter of 3,516 km, a density of 3.97 g/cm³, and a surface gravity of 0.2 G. Tidal stresses generated by Sangax heat the interior of the world and cause geological activity. Its atmosphere is rated as [[Very thin atmosphere|Very Thin]], [[Tainted atmosphere|Tainted]], with a mean surface pressure of 0.23 bar and a composition of 73% nitrogen (N<sub><small>2</small></sub>), 18% oxygen (O<sub><small>2</small></sub>), 7% carbon dioxide (CO<sub><small>2</small></sub>), 1% argon (Ar), and 1% water vapor (H<sub><small>2</small></sub>O), neon (Ne), and other trace gases. The [[Tainted atmosphere|taint]] is caused by the high percentage of atmospheric carbon dioxide and the relatively high levels of background radiation: emission rates exceed 2 rads per hour. Approximately 19% of the surface is covered in a crust of water-ice and frozen gases, though geologically active regions may have small areas of liquid water. Mean surface temperature: -158°C. Northern polar temperature: -62°C. The [[Fringian_Variant_System_Description#Planetary_Climate|climate]] is rated as Very Cold and is static, with no seasonal changes during the local year. The atmosphere is extremely sluggish and minor weather systems, driven by the star, affect northern regions of the globe. Weather patterns closely match cycles within the star.
 
  
 
==== Mainworld geography and topography ====
 
==== Mainworld geography and topography ====
Total surface area: 39.9 million km², Land surface area: 32.3 million km², Ice coverage: 7.6 million km². The Everdark mountains dominate the southern hemisphere and extend to the equator. The rugged northern temperate zone, called the Dawnlands, is marked by the Murtaugh Depression. It is formed by five huge, shallow impact craters spaced at regular intervals across the globe and linked by fractured canyons. They give way to the Powder Plains and the jagged northern Glarebright mountains.
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Total surface area: 39.9 million km², Land surface area: 32.3 million km², Ice coverage: 7.6 million km². The Everdark mountains dominate the southern hemisphere and extend to the equator. The rugged northern temperate zone, called the Dawnlands, is marked by the Murtaugh Basin, the ancient remains of five huge impact craters. They give way to the Powder Plains and the jagged northern Glarebright mountains.
* Oxygen contained deep within the world's interior is released by outgassing and serves to renew the atmosphere: it continuously reacts with surface materials and other atmospheric gases, gradually reducing the percentage of oxygen in the air. Experts predict that the atmosphere will be reduced to a [[Trace atmosphere|trace]] in a few tens of million of years.
 
  
=== Native Lifeforms ===
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=== Native lifeforms ===
==== Sangax-Cleistra System ====
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Cleistra has no native life and no offworld organisms have colonised the world. Seismic activity allows gas and liquid to escape from the interior of the planet and helps the process of atmospheric renewal.
Neither [[world]] in the [[system]] is known to have native life.
 
  
 
== History & Background (Dossier) ==
 
== History & Background (Dossier) ==
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|S1= Author & Contributor: Lord (Marquis) and Master Scout Emeritus [[User: Alagoric|Adie Alegoric Stewart]] of the [[IISS]]
 
|S1= Author & Contributor: Lord (Marquis) and Master Scout Emeritus [[User: Alagoric|Adie Alegoric Stewart]] of the [[IISS]]
 
|S2= Author & Contributor: Lord (Marquis) and Master of Sophontology [[User:Maksim-Smelchak|Maksim-Smelchak]] of the [[Ministry of Science]]
 
|S2= Author & Contributor: Lord (Marquis) and Master of Sophontology [[User:Maksim-Smelchak|Maksim-Smelchak]] of the [[Ministry of Science]]
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|S3=
 
}}
 
}}
  
  
[[Category: Anomaly worlds]]
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{{LEA|Distant Fringe|Distant Fringe worlds|T5 Second Survey worlds}}
{{LEA|Distant Fringe|Distant Fringe worlds}}
 

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