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Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)

Sirius neighboring systems
Sirius neighboring systems
System Information
X:Y Coordinates -2.562 : -7.86[e]
Spectral class A1V[1]
Planets 6[1]
Sirius VI Orbital view
Sirius VI Orbital view
System position 6th[1]
Jump point
47 days[1]
Moons 1 (Sirius VI-a)[1]
Surface gravity 0.86[1]
Atmospheric pressure Thin (Breathable)[1]
Equatorial temperature 33°C[1]
Surface water 16%[1]
Highest native life Plants[1]
Reference Year 3130[1]
Ruler Governor: Richard Leybel[1]
Planetary Legate: Beverly Liktenstein[1]
Capital Wiedergeburt[1]
Population 9,109,000[1]

Political AffiliationEdit

The main star of the Sirius system (Sirius A) has a white dwarf companion (Sirius B) on an elongated orbit that brings it to within nearly 10 AU of the primary roughly every 50 years, with such close passages in 2993.

Planetary InfoEdit

Sirius VEdit

The planet Sirius V has a chill, subzero hydrogen-methane atmosphere that makes for a yellow-green sky.[35] Red mud and ice-rimmed pools of liquid ammonia are mentioned.[35] The surface temperature rarely raises beyond -40 centigrade, and the gravity is 1.5g; the planet was settled almost a century after the research station on Sirius VI-a, to exploit its considerable resources of heavy metals and transuranic minerals.[35]

Sirius VI/VI-aEdit

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 Sirius VI was colonized. Throughout the Succession Wars, the terraforming that allowed the settlement of Sirius VI was slowly reversed, until the only habitable area was the domed city of Calgary. The capital city of Sirius VI-a, Lost Hope, was located on the Bounty continent, one of two main continents on the moon. Bounty and the other major continent, Hinterlands, would become home to the bulk of the population in the Sirius system.[1]

System HistoryEdit

Early HistoryEdit

Terran Alliance explorer Alana Korvin DeVall founded the Sirius colony[36] in 2167[2]. 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.[2] 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,[3] and became one of the worlds within the Alliance Core region of the Terran Hegemony.[9]

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.[2] Whilst Sirius VI continued to be plagued with chronic earthquakes and volcanic activity and remained a water-poor world, the mining colonists on Sirius VI and the settlers on Sirius VI-a developed a symboitic relationship, and travel between the two dwarfed the traffic with other systems in terms of frequency. The Projects were an interesting waypoint for those traveling between the two.[1]

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.[2] The blockade resulted in widespread starvation on Sirius VI.[1]

Succession Wars eraEdit

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.[2] Many of the planetary settlements on Sirius VI were torn apart by seismic activity, and conditions on the planet steadily worsened; control of the Sirius system was fought over by the Confederation, the Free Worlds League and later the Federated Commonwealth.[1]

Third Succession WarEdit

In 2901 the Tenth and Fourteenth Marik Militias were responsible for conquering Sirius for the Free Worlds League.[19]

As of ca. late 3027, Sirius was described as a "fairly important world on Liao trade lanes".[37]

Tiantan massacreEdit

Sirius V was raided by the Gray Death Legion (in the employ of House Marik and the Free Worlds League) in late 3027.[38] Following the surrender of the capital city of Tiantan, rogue elements posing as the Gray Death Legion detonated demolition charges at the city's domes and marched BattleMechs through the ruins, killing some 17 million inhabitants with the intent of blaming the atrocity on the Gray Death Legion. It would later be revealed that a conspiracy involving rogue ComStar Precentor Emilio Rachan and Lord Garth of Irian was behind the act.[39]

Fourth Succession WarEdit

Following negotiations between Colonel Pavel Ridzik, chief military advisor to Chancellor Maximillian Liao, and AFFS Lieutenant General Ardan Sortek, conducted in February 3029 Ridzik created a new nation, the Tikonov Free Republic. The Republic was created by incorporating those worlds of the Tikonov Commonality that hadn't already been conquered during the first half of the Fourth Succession War. Ridzik returned to Elgin, the new capital of the Tikonov Free Republic, on the 3rd of March 3029 and swiftly began implementing a new government consisting of family members, friends and other appointees loyal to himself, purging dissident elements on the various Republic worlds and taking the opportunity to settle old scores. Sirius was one of the systems incorporated into the Republic.[21]

FedCom Civil WarEdit

By the end of the FedCom Civil War and the demise of the Federated Commonwealth Sirius VI had been rendered almost completely uninhabited, the world having become a wasteland of a broken, shifting landscape intercut with rivers of volcanic lava.[1]


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.[40]

The Dark AgeEdit

The Sirius system was incorporated into the Republic of the Sphere; the bulk of the population in the system lived on Sirius VI-a, scattered in small farming communities across the two major continents. Calgary remained the last population center on Sirius VI, huddled on the banks of the Sulfur Sea.[1]

Military DeploymentEdit

Industrial CentersEdit

Nearby SystemsEdit

Systems within 60 light-years (distance in light years)
Closest systems first:
Procyon 5.7 Keid 7.9 Terra 10.4 Rigil Kentarus 10.7
New Home 14.7 Carver V 15.7 New Earth 20.8 Bryant 21.1
Caph 22.8 Graham IV 23.5 Killbourn 23.5 Alula Australis 24.9
New Stevens 26.7 Outreach 27.4 Oliver 30.1 Brownsville 31.0
Hechnar 32.6 Altair 33.0 Epsilon Eridani 34.3 Yorii 34.5
Pollux 36.7 Fomalhaut 36.7 Thorin 36.8 Zavijava 36.8
Dieron 37.5 Epsilon Indi 39.5 Asta 40.1 Chara 40.9
Devil's Rock 41.1 Denebola 41.5 Northwind 41.7 Imbros III 42.4
Capolla 44.1 Lipton 45.6 Castor 46.7 Rocky 46.8
Elgin 47.2 Hall 47.8 Saffel 47.9 Muphrid 47.9
Zosma 50.1 Terra Firma 50.8 Tyrfing 51.1 Lockdale 53.3
Zollikofen 53.6 Afleir 53.6 Mandal 54.5 Hsien 54.7
Small World 55.1 Dyev 56.9 Sheratan 57.1 Talitha 58.4
Athenry 59.0


  • The planet Sirius is misspelled in the ComStar (sourcebook) as Siris.[43]


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 Dark Age: Republic Worlds (3130), p. 250, "Sirius"
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 The Star League, p. 177
  3. 3.0 3.1 Handbook: House Marik, p. 16, "Free Worlds League Founding [[2271]"
  4. Handbook: House Kurita, p. 18, "Draconis Combine Founding - 2319"
  5. Handbook: House Steiner, p. 13, "Lyran Commonwealth Founding [2341]"
  6. Handbook: House Liao, p. 17, "Capellan Confederation Foundation [2366]"
  7. Handbook: Major Periphery States, p. 18, "Rim Worlds Republic after Age of War [2571]"
  8. Handbook: House Steiner, p. 25, "Lyran Commonwealth after Age of War [2571]"
  9. 9.0 9.1 Historical: Reunification War, p. 159, "Inner Sphere - 2596"
  10. Era Report: 2750, p. 37, "Inner Sphere - 2750"
  11. Historical: Liberation of Terra Volume 1, p. 11, "Inner Sphere - 2765"
  12. Historical: Liberation of Terra Volume 1, p. 84-85, "Atrocities And Excesses"
  13. Historical: Liberation of Terra Volume 1, p. 104, "Rim Worlds Republic - [2767] Map"
  14. 14.0 14.1 Historical: Liberation of Terra Volume 1, p. 138, "Operation LIBERATION Wave 1 [July 2772 - December 2774]"
  15. First Succession War (Source Book), pp. 24-25, "Inner Sphere - [2786] Map"
  16. Handbook: House Marik, p. 34, "Free Worlds League after First Succession War [2822]"
  17. First Succession War (Source Book), pp. 112-113, "Inner Sphere - [2822] Map"
  18. Handbook: House Marik, p. 38, "Free Worlds League after Second Succession War [2864]"
  19. 19.0 19.1 House Marik (The Free Worlds League), p. 90, "Marik Militia"
  20. 20.0 20.1 20.2 House Liao (The Capellan Confederation), p. 105 - "Unit Deployment Table"
  21. 21.0 21.1 NAIS The Fourth Succession War Military Atlas Volume 2, p. 16-17, "Tikonov Free Republic"
  22. NAIS The Fourth Succession War Military Atlas Volume 2, p. 16, "Tikonov Commonality (Map)"
  23. NAIS The Fourth Succession War Military Atlas Volume 2, p. 94, "End Of The War"
  24. Historical: War of 3039, p. 133, "Inner Sphere - 3040"
  25. Era Report: 3052, p. 11, "Inner Sphere - 3050"
  26. Era Report: 3052, p. 23, "Inner Sphere - April 3052"
  27. Era Report: 3062, p. 11, "Inner Sphere - August 3057"
  28. Handbook: House Liao, p. 60, "Capellan Confederation after Operation Guerrero - [3058] Map"
  29. Era Report: 3062, p. 29, "Inner Sphere - July 3063"
  30. 30.0 30.1 Field Manual: Updates, p. 159 - "Fre Worlds League Deployment Table"
  31. Handbook: House Liao, p. 68, "Capellan Confederation after FedCom Civil War - [3067] Map"
  32. Jihad: Final Reckoning, p. 43, "Inner Sphere - [3067] Map"
  33. Map of the Inner Sphere 3130
  34. Inner Sphere - 3145
  35. 35.0 35.1 35.2 The Price of Glory (PDF Edition), pp. 5 - 10
  36. House Liao (The Capellan Confederation), p. 64
  37. The Price of Glory, p. 119
  38. According to the Gray Death Legion scenario pack, p. 33, the Gray Death Legion made landfall on Helm on 24 March 3028 after a hasty trip from Sirius V. Given the travel time to Sirius V's jump point, the distance between the Sirius and Helm systems which requires at least five jumps, and the travel time from Helm's jump point to the planet indicates that the Gray Death Legion must have left Sirius V sometime in late 3027.
  39. The Price of Glory
  40. Jihad: Final Reckoning, p. 47, "The Jihad In Review"
  41. 41.0 41.1 First Succession War (Source Book), p. 138, "First Succession War Deployment Table - FWLM"
  42. 42.0 42.1 House Liao (The Capellan Confederation), p. 106 - "Unit Deployment Table"
  43. 43.0 43.1 ComStar (sourcebook), p. 84, "Com Guards Deployment Table"
  44. 'ComStar (sourcebook), p. 85'
  45. Field Manual: Free Worlds League, p. 110 - "Free Worlds League Deployment Table"
  46. Field Manual: Free Worlds League, p. 113 - "Free Worlds League Deployment Table"
  47. Field Manual: Updates, p. 161 - "Free Worlds League Deployment Table"
  48. Field Manual: Updates, p. 160 - "Free Worlds League Deployment Table"
  49. Field Report: Clans, p. 15, "Clan Jade Falcon Deployment Status"
  50. Field Manual: 3145, p. 145, "Republic Armed Forces - Triarii Protectors"
  51. First Succession War, p. 125, "Shipbuilding Casualties of the First Succession War"
  52. Experimental Technical Readout: Primitives, Volume 5, p. 10, "Asher Hover Scout"