Aysur Solar-system – Austin Bunton Designs

System Specs:

Stellar Mass: 0.98 Sol Masses
Stellar Class: G
Luminosity: N/A Sol
Planets: 6
Moons: 1
Asteroid Belts: 1
Asteroids: 1
Objects: 0

Prerequisite: Collector Ship (mission) or Project Firewalker: Rosalie Lost (Mass Effect 2)
Prerequisite: Leviathan: Find Garneau (Mass Effect 3)
Aysur has above-average amounts of mineral resources. Its gas giants have moderate amounts of metals while its terrestrial worlds have rich concentrations.

Most of the mining interests in the area are involved in Arvuna’s economy. Despite its potential wealth, the system itself is considered politically insignificant to the Systems Alliance, the Attican Traverse, and even the Terminus Systems.

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Planets Directory:

Agnin
Shasu
Dranen (Arvuna‡)
asteroid belt
Mahavid‡
Alformus
Shir
Tamgauta

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Agnin:

Orbital Distance: 0.7 AU
Orbital Period: 0.6 Earth-years
Keplerian Ratio: 0.953
Radius: 4,834 km
Day Length: 61.1 Earth-hours
Atmospheric Pressure: 86.87 atm
Surface Temp: 684 °C
Surface Gravity: 0.5 g
Mass: 0.285 Earth-masses

A hothouse planet, Agnin’s scorching clouds of methane and sulfur dioxide give the planet a pale green color in visible light. The SO2 from volcanic activity rains down as sulfuric acid in the upper atmosphere, but this is boiled away before the liquid ever reaches the surface. Agnin’s harsh environment has prevented exploration by anything except probes.

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Shasu:

Orbital Distance: 1.4 AU
Orbital Period: 1.7 Earth-years
Keplerian Ratio: 0.949
Radius: 1,454 km
Day Length: 37.4 Earth-hours
Atmospheric Pressure: 0.34 atm
Surface Temp: 23 °C
Surface Gravity: 0.1 g
Mass: 0.005 Earth-masses

Shasu is a dwarf planet that is believed to have been ejected from Agnin during a giant impact with another planet-sized body. At the time, Agnin had a magma ocean covering much of its surface, and the liquid rock sprayed into space, where it coalesced and cooled over millions of years. The theory is that during the cooling, Shasu first orbited Agnin but was eventually pulled from that orbit by the gravity wells of other planets, primarily Dranen.

Today, Shasu is relatively temperate, with a light hydrogen-helium atmosphere, attracting spacers who use its atmosphere to refuel. Its crust composition is similar to Agnin, evident in its high sulfur content.

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Dranen:

Orbital Distance: 2.5 AU
Orbital Period: 4.0 Earth-years
Keplerian Ratio: 0.977
Radius: 72,021 km
Day Length: 17.1 Earth-hours
Atmospheric Pressure: 1.94 atm
Surface Temp: N/A °C
Surface Gravity: N/A g
Mass: N/A Earth-masses
Satellites: 44

A sizable hydrogen-nitrogen gas giant just on the far side of its pale yellow star’s “frost line,” Dranen is known for its spectacular storms. At least three persistent observable “spots” — actually cyclonic and anticyclonic storms — have lasted for over 544 years, significantly longer than Jupiter’s Great Red Spot. The largest of these spots, the Ishna, has consistently held a diameter over three times that of Earth.

Dranen has 44 moons. Two of them are of special interest to the Citadel Committee on Habitable Worlds. The first, Arvuna, is a life-bearing world that has already been colonized. The second, Alahya, is slowly being terraformed into an ammonia-based world for volus populations.

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Arvuna:

Orbital Distance: 2.5 AU (Dranen)
Orbital Period: 4.0 Earth-years (Dranen), 66 days (Arvuna)
Keplerian Ratio: _ 17.863
Radius: 6,448 km
Day Length: 29.2 Earth-hours
Atmospheric Pressure: 1.45 atm
Surface Temp: 1 °C
Surface Gravity: 1.1 g
Mass: 1.116 Earth-masses
Colony: human
Capital: Asa, founded 2160 CE, population 948,700

Arvuna, a moon of Dranen, is classified as a water world because oceans or ice cover 90% of its surface. Besides prodigious sea life, Arvuna is home to a host of venomous arthropodal pests in the tropical zone with metallic carapaces similar to those found on Palaven to resist radiation coming from Dranen’s magnetosphere. There are several well-shielded human colonies on Arvuna, although they are alienated from the Council and politically insignificant to the Traverse and Terminus Systems.

The Reapers have yet to reach Arvuna, concentrating instead on the Balor system. While this cuts Arvuna off from the cluster’s mass relay, it is at least some evidence that the Reapers cannot be everywhere at once.

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Mahavid:

Orbital Distance: 6.3 AU
Orbital Period: 15.8 Earth-years
Keplerian Ratio: N/A
Radius: 535 km
Day Length: 10.3 Earth-hours
Atmospheric Pressure: Trace atm
Surface Temp: −142 °C
Surface Gravity: 0.0006 g
Mass: N/A (near 0) Earth-masses
Colony: population 152

Mahavid is a metallic asteroid in the very sparse Nahata Belt. It has a high nickel and iron content in the form of kamacite. The rights to mine Mahavid belong to T-GES Mineral Works, who sell their products primarily to the colonists of Arvuna. A close fly-by reveals light emanating from its facilities.

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Alformus:

Orbital Distance: 10.1 AU
Orbital Period: 32.2 Earth-years
Keplerian Ratio: 0.994
Radius: 67,626 km
Day Length: 8.8 Earth-hours
Atmospheric Pressure: 1.81 atm
Surface Temp: N/A °C
Surface Gravity: N/A g
Mass: N/A Earth-masses

A hydrogen-helium gas giant, Alformus had its helium-3 refueling stations destroyed in an attack by Grow Zero, an anti-population terrorist group that wanted no more immigration to Arvuna. A consortium of Arvuna-based corporations are currently rebuilding the stations.

ALLIANCE ADVISORY: Alformus is not considered vital to the stability of the Aysur system. Civilians working on the helium-3 platforms should not expect Alliance military intervention in case of kidnapping or other violence.

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Shir:

Orbital Distance: 20.0 AU
Orbital Period: 89.7 Earth-years
Keplerian Ratio: 0.994
Radius: 4,900 km
Day Length: 31.0 Earth-hours
Atmospheric Pressure: Trace atm
Surface Temp: −185 °C
Surface Gravity: 0.7 g
Mass: 0.41 Earth-masses

A remote rock planet capped in ice, Shir has been exploited by Arvunan corporations for its minerals. Home to gold veins, which is used in spaceship shielding as well as jewelry, and cobalt deposits, used in high-tensile alloys, Shir shows no signs of being exhausted any time soon. A light gravity helps keep the planetary exportation process cheap.

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Tamgauta:

Orbital Distance: 42.2 AU
Orbital Period: 275.1 Earth-years
Keplerian Ratio: 0.993
Radius: 3,354 km
Day Length: 64.8 Earth-hours
Atmospheric Pressure: Trace atm
Surface Temp: −216 °C
Surface Gravity: 0.2 g
Mass: 0.055 Earth-masses

The outermost planet of the Aysur system, Tamgauta is remote and largely unexplored. Its carbon dioxide atmosphere has long since frozen into fields of dry ice.