Ryosa (world)

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

Ryosa/Sithula (Divide 2609)
Classic Era (1115)
Starport? Error in Starport Decode
Size4 Small (6,400 km, 0.32g - 0.46g)
Atmosphere4 Thin (tainted)
Hydrographics0 Desert World 0%
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 K0 IV D
Planetoid Belts 1
Gas Giants 4


Astrography and Planetology[edit]

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

Binary Solar System[edit]

No results
Ryosa Binary Star System
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)


Primary Giant 2.3 4000 - 5000 4.67
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.03071 0.17924 1.72 - 2.8 3.071 30.71
Orbit #  * 0 5 5 9

System Data[edit]

Ryosa System[edit]

The primary is an unnamed orange subgiant star. It has a luminosity of 4.67 Sols, a mass of 2.3 Sols, and a diameter of 4.61 million km. The inner system consists of (III) an exotic atmosphere radworld, and (IV) a corrosive atmosphere inferno world – orbital positions (I) and (II) are empty. (V-I) Ryosa, designated the mainworld, and (V-II) a standard atmosphere hospitable world have a shared orbit within the habitable zone. (VI) a ringed large gas giant, (VII) a very large gas giant, (VIII-I) a small gas giant, and (VIII-II) a ringed small ice giant form the outer system. Many of the worlds retain satellites.

Dwarf Star Subsystem[edit]

The companion is an unnamed dwarf star lying approximately 2,350 from the primary. It has a luminosity of 0.00003 Sols, a mass of 1.11 Sols, and a diameter of 8,450 km. (I) a vacuum worldlet, and (II) a sparse icy planetoid belt form the outer system. No significant body retains satellites.

Mainworld Data[edit]

(V-I) Ryosa[edit]

(V-I) Ryosa is designated the mainworld. It orbits the primary at a mean distance of 1.39 AU (207.9 million km), within the habitable zone. It has an orbital period of 1 year 30 days and a rotation period of 22.5 hours. The axial tilt is 164 degrees. Ryosa has a diameter of 6,977 km, a density of 6.34 g/cm³, and a surface gravity of 0.63 G. The world is geologically active. Its atmosphere is rated as Thin, Tainted, with a mean surface pressure of 0.62 bar and a composition of 83% nitrogen (N2), 16% abiotic oxygen (O2), and 1% argon (Ar), carbon dioxide (CO2), nitrogen dioxide (NO2), ozone (O3), neon (Ne) and other trace gases. The taint is caused by the low percentage of atmospheric oxygen and by the lack of water vapor in the atmosphere. Approximately 0.5% of the surface is covered in pools and lakes of liquid water. Mean surface temperature: 63°C. The atmosphere is active and strong weather systems driven by the star drive across the globe. The climate is seasonal.


Ryosa retains a single natural satellite, a tiny cratered vacuum worldlet named Curlew:

(V-Ia) Curlew (known UWP ?S00???-?, orbiting at 7 Diameters/49,000 km)

Mainworld Geography and Topography[edit]

Total surface area: 153 million km², Land surface area: 152.3 million km², Water surface area: 700,000 km².

  • The oxygen in the atmosphere is abiotic in origin, produced by the photocatalytic reaction between the high levels of UV energy radiating from the star and titanium dioxide (TiO2), which is found in surface minerals such as ilmenite.

Native Lifeforms[edit]

Ryosa, the mainworld, does not have native life.

The temperate hospitable world lying in orbital position (IV) (within the habitable zone) has primitive native life, consisting entirely of microscopic cyanobacteria-parallels that exist within every ecological niche. Their metabolic functions maintain the process of atmospheric renewal.

History & Background (Dossier)[edit]

The Ryosa system has been studied by the Local Astrographical Survey Project, a part of the Astronomy Department of the University of Selasia.

World starport[edit]

Ryosa has no listed Starport data.

World technology level[edit]

Ryosa has no listed Technology Level data.

World government[edit]

Ryosa has no listed Government data.

World military[edit]

No information yet available.

World economy[edit]

No information yet available.

Trade data[edit]

No information yet available.

World demographics[edit]

Ryosa has no listed Population data.

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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