|Sirius VI, Sirius VI-a|
|Planetary System Info|
|Position in System||6 (of 6)|
|Time to Jump Point||47 days|
|HPG Facility Class||B|
|Percent, Level of Native Life||Plants|
|Planetary Capital||Lost Hope|
(References to Sirius)
Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)
X: -2.56 Y: -7.85[e]
- Number of Moons: 1 (Sirius VI-a)
- Surface Water: 16%
- Atm. Pressure: Thin (Breathable)
- Surface Gravity: 0.86
- Equatorial Temp: 33°C
- Highest Native Life: Plants
The first settlements on Sirius were actually on Sirius VI-a, the moon of the last planet, as it had a breathable atmosphere. It wasn't until around fifty years later that the resource-rich, but oxygen-poor planet was colonized. Throughout the Succession Wars, the terraforming that allowed the settlement of Sirius VI was slowly reversed, until the only habitable area is the domed city of Calgary. The capital, Lost Hope, is on the Bounty continent of Sirius VI-a, which is also home to the continent of Hinterlands.
Terran Alliance explorer Alana Korvin DeVall founded the Sirius colony in 2167. Upon its discovery, Sirius was considered a poor colonization candidate, due to its hostile atmosphere and frequent seismic activity, but its vast mineral wealth encouraged the adventurous (and desperate) to seek a profit. In 2200, the major mining corporations finally decided to move in, and began terraforming Sirius with oxygen factories and sulfur-eating algae. Sirius was one of the systems that remained a part of the Terran Alliance following the Outer Reaches Rebellion and the Demarcation Declaration of 2242, and became one of the worlds within the Alliance Core region of the Terran Hegemony.
By 2300, the atmosphere had become breathable, and Seismic Suppressor Stations were constructed, designed to sense an approaching earthquake and prevent it through underground explosives. Despite this use of advanced Hegemonic technology, surface disruptions prevented the construction of any terrestrial manufacturing centers. Instead, orbital factories were constructed, along with twin habitation colonies known as "The Projects." Each station could house 10,000 workers in Terra-like comfort.
During the Amaris Civil War, the Rim Worlds Republic destroyed The Projects without reason, killing 8,000 colonists. A further 9,000 were killed on the planet's surface when Republican forces stripped the planet of its resources and prevented the shipping of any further supplies. After the fall of the Star League, the planet fell under the control of the Capellan Confederation, but lacking the Hegemony's technological know-how, the oxygen factories have since started to fail, forcing much of the population to evacuate the planet.
During the third week of June 3069 the worlds of Berenson, Irian, Procyon and Sirius were rocked by internal conflict as Free Worlds League Loyalists clashed with local government forces as a result of the local governments turning against the false Thomas Marik and the government on Atreus.
 Era Specific Data
- Population: 9,109,000
- Governor: Richard Leybel
- Planetary Legate: Beverly Liktenstein
 Planetary Garrison
- Lothar's Fusiliers (2nd Battalion)
- 3rd Confederation Reserve Cavalry (1st Battalion)
- Justine's Grenadiers (2nd Battalion)
- Kerr's Intruders (3rd Battalion)
 3059 to 3067
 Owner History
- 2167 - Terran Alliance 
- 2200 - Terran Alliance 
- 2271 - Terran Alliance 
- 2341 - Terran Hegemony 
- 2366 - Terran Hegemony 
- 2571 - Terran Hegemony 
- 2596 - Terran Hegemony 
- 2750 - Terran Hegemony 
- 2765 - Terran Hegemony 
- 2767 - Amaris Empire 
- 3025 - Capellan Confederation 
- 3030 - Tikonov Free Republic
- 3040 - Federated Commonwealth
- 3052 - Federated Commonwealth
- 3057 - Chaos March
- 3062 - Free Worlds League
- 3067 - Free Worlds League 
- 3072 - Word of Blake Protectorate
- 3130 - Republic of the Sphere 
 Nearby Systems
| Systems within 60 light-years (distance in light years)|
Closest systems first:
|Procyon||5.69||Keid||7.93||Terra||10.42||Rigil Kentarus||10.69||New Home||14.65|
|Carver V||15.74||New Earth||20.77||Bryant||21.11||Caph||22.78||Graham IV||23.49|
|Killbourn||23.53||Alula Australis||24.91||New Stevens||26.68||Outreach||27.38||Oliver||30.08|
|Epsilon Indi||39.47||Asta||40.09||Chara||40.93||Devil's Rock||41.07||Denebola||41.52|
- The planet Sirius is mis-spelled in ComStar (sourcebook) as Siris.
- ↑ 1.0 1.1 1.2 Dark Age: Republic Worlds (3130), p. 247, "Planet Profile"
- ↑ House Liao (The Capellan Confederation), p. 64
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 The Star League, p. 177
- ↑ 4.0 4.1 Handbook: House Marik, p. 16, "Free Worlds League Founding ["
- ↑ 5.0 5.1 Historical: Reunification War, p. 159, "Inner Sphere - 2596"
- ↑ Jihad: Final Reckoning, p. 47, "The Jihad In Review"
- ↑ 7.0 7.1 7.2 House Liao (The Capellan Confederation), p. 105 - "Unit Deployment Table"
- ↑ 8.0 8.1 House Liao (The Capellan Confederation), p. 106 - "Unit Deployment Table"
- ↑ 9.0 9.1 ComStar (sourcebook), p. 84, "Com Guards Deployment Table"
- ↑ Field Manual: Free Worlds League, p. 110 - "Free Worlds League Deployment Table"
- ↑ 11.0 11.1 Field Manual: Updates, p. 159 - "Fre Worlds League Deployment Table"
- ↑ Field Manual: Free Worlds League, p. 113 - "Free Worlds League Deployment Table"
- ↑ Field Manual: Updates, p. 161 - "Free Worlds League Deployment Table"
- ↑ Field Manual: Updates, p. 160 - "Free Worlds League Deployment Table"
- ↑ Field Report: Clans, p. 15, "Clan Jade Falcon Deployment Status"
- ↑ Handbook: House Steiner, p. 13, "Lyran Commonwealth Founding "
- ↑ Handbook: House Liao, p. 17, "Capellan Confederation Foundation "
- ↑ Handbook: Major Periphery States, p. 18, "Rim Worlds Republic after Age of War "
- ↑ Handbook: House Steiner, p. 25, "Lyran Commonwealth after Age of War "
- ↑ Era Report: 2750, p. 37, "Inner Sphere - 2750"
- ↑ Historical: Liberation of Terra Volume 1, p. 11, "Inner Sphere - 2765"
- ↑ Historical: Liberation of Terra Volume 1, p. 84-85, "Atrocities And Excesses"
- ↑ Map of the Inner Sphere 3130
- ComStar (sourcebook)
- Dark Age: Republic Worlds (3130)
- Era Report: 2750
- Field Manual: Free Worlds League
- Field Manual: Updates
- Field Report: Clans
- Handbook: House Liao
- Handbook: House Marik
- Handbook: House Steiner
- Historical: Liberation of Terra Volume 1
- Historical: Reunification War
- House Liao (The Capellan Confederation)
- Jihad: Final Reckoning
- Map of the Inner Sphere 3130
- The Star League