Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)
Castor neighboring systems
|X:Y Coordinates||-40.43 : -16.683[e]|
The Castor system is located near the Devil's Rock and Pollux systems. Relatively little information is available on the Castor system, but it is known that the system has at least six planets, and that at least one of those planets is inhabited and is an eight-day transit from the system nadir jump point at an acceleration of 1g. It is also known that the sixth planet in the system, Castor VI, has several moons, and that just beyond the orbit of the most distant of those moons is a known pirate point.
The Castor system was colonized at some point during the First Exodus from Terra and was a member of the Terran Hegemony by the time the Capellan Confederation was founded in the mid-twenty-fourth century.
Amaris Civil WarEdit
The Castor system became the resting place of the SLS Nelson, a Black Lion-class battlecruiser and winner of the Star League Defense Force Martial Olympiad in 2732; the Nelson played an important part in the liberation of Oliver, but took heavy damage in the process. The crew of the Nelson managed to nurse her as far as the SLDF fleet station in the Castor system, only for the SLDF command to declare that the Nelson wasn't considered a viable candidate for repair. As a result of this decision the Nelson was scuttled and abandoned in a long elliptical orbit around Castor.
Clan Invasion EraEdit
With the assistance of the Word of Blake the Free Worlds League discovered the location of the SLS Nelson in the Castor system and retrieved her, transporting her to the Ionus system to be repaired in secret at the Illium Shipyards before returning her to active service under a new designation, that of the FWLS Xanthos.
- 2271 - Inhabited world 
- 2366 - Terran Hegemony 
- 2571 - Terran Hegemony 
- 2571 - Terran Hegemony 
- 2596 - Terran Hegemony 
- 2750 - Terran Hegemony 
- 2765 - Terran Hegemony 
- 2767 - Amaris Empire 
- 2771 - Amaris Empire 
- 2774 - Amaris Empire 
- 2775 - Terran Hegemony 
- 2785 - Terran Hegemony 
- 2786 - Free Worlds League 
- 2822 - Free Worlds League 
- 2838 - Contested (Federated Suns/Free Worlds League/Lyran Commonwealth)
- 2839 - Lyran Commonwealth 
- 2864 - Free Worlds League 
- 3011 - Free Worlds League 
- 3025 - Free Worlds League 
- 3030 - Lyran Commonwealth 
- 3040 - Federated Commonwealth 
- 3050 - Federated Commonwealth 
- 3052 - Federated Commonwealth 
- 3057 - Free Worlds League 
- 3058 - Free Worlds League 
- 3063 - Free Worlds League 
- 3067 - Free Worlds League 
- 3075 - Word of Blake Protectorate 
- 3079 - Word of Blake Protectorate 
- 3081 - Republic of the Sphere 
- 3085 - Republic of the Sphere 
- 3130 - Republic of the Sphere 
- 3135 - Independent world 
- 3145 - Wolf Empire 
Star League EraEdit
When Stefan Amaris launched his fateful coup, the Thirty-eighth Amaris Fusiliers were at the forefront of efforts to secure Castor for the Amaris Empire. Over the next decade the Fusiliers worked to maintain control of Castor, using various strongarm tactics to raise a strong Patriot contingent on the planet, whilst imprisoning government officials and other prominent citizens. Hundreds of thousands were imprisoned and their valuables confiscated, and tens of thousands of those imprisoned were never seen again during the Fusiliers' tenure on Castor.
In January 2775 Stefan Amaris redeployed large numbers of Amaris Empire Armed Forces to a dozen worlds, including Castor. AEAF units had used weapons of mass destruction regularly against Star League Defense Force units throughout the Hegemony Campaign, predominantly to either damage the SLDF units targeted or to strike at civilian targets to prevent the SLDF from obtaining resources and supplies. In this case, Amaris' orders were different: he intended to create scorched wastelands that Commanding General Aleksandr Kerensky would have no choice but to try and clear, whilst saddling the SLDF with huge numbers of sick and starving civilians. The AEAF units deployed to Castor and the other eleven worlds due to be abandoned by Amaris launched large-scale WMD attacks with one purpose: to ravage the worlds, preventing them from sustaining either their human populations or their various industries... to create wastelands.
The AEAF tactics on Castor were both brutal and brutally effective. Kerensky deployed twelve corps of SLDF personnel into Amaris Empire space, and each discovered the same horrific situations. Forced to deploy the SLDF reserve into action, by February Kerensky had almost a hundred SLDF divisions either on the twelve ravaged worlds or en route to them, trying to provide aid to the populations and to clear up what damage they could. Castor fell within the operating area of Task Force Commonwealth, and the Second Army Group deployed to try and assist the population. The devastation wreaked across Castor and the other worlds bought Amaris time; for several months Kerensky was unable to resume offensive operations because of a lack of resources, and ultimately the Commanding General had no choice but to call on the Capellan Confederation, Lyran Commonwealth and Federated Suns to provide relief where they could.
Having scorched Castor, the Thirty-eighth Fusiliers ignored the order to withdraw to Terra, instead abandoning Amaris and heading into the Free Worlds League, where they promptly vanished - one of five assorted Republican regiments identified by historians as having escaped from the occupation of the Hegemony largely intact.
Second Succession WarEdit
In 2838 the Free Worlds League Military was struggling under the combination of the ComStar interdiction of the Free Worlds League and Parliament's efforts to choke off funding to the military. Both the Capellan Confederation and Lyran Commonwealth had taken advantage of the League's woes to make military gains, with the LCAF expanding two major salients into the League with ruthless efficiency. However, in 2838 the FWLM forces fighting a tenacious defense in the League systems of the former Terran Hegemony found their LCAF opponents being hampered by expeditions from the Draconis Combine and Federated Suns, both looking to make gains of their own from the weakened League. Castor was one of the systems caught up in this - the LCAF had landed the Seventeenth Skye Rangers on the planet to destroy the defending FWLM garrison and occupy the world, only to have the Third Ceti Hussars land on the world later to try and claim it for the Federated Suns. Although the LCAF managed to rebuff the Ceti Hussars and finally claim Castor in spring 2839, by the time they had secured the world the interdiction had ended.
Third Succession WarEdit
In June 3011 two mercenary units in the employ of the LCAF, Snord's Irregulars and the Kell Hounds launched a joint attack on Castor. The mission was to find and destroy a rumored stockpile of old nuclear weapons, and to give the Kell Hounds some combat experience in the process (their first combat mission in fact); Cranston Snord also intended to try and acquire a collection of Fabergé eggs believed to be on Castor, and to have the Irregulars humiliate the Thirtieth Marik Militia. According to subsequent commentary from Captain Jonathan Taylor, Thirteenth Marik Militia, Second battalion, First company, Cranston Snord personally destroyed his Centurion during that joint raid, indicating that at least elements of the Thirteenth Marik Militia were involved in the fighting. The attackers managed to identify and destroy the weapons cache just before the defenders could use the nuclear weapons on the attackers with the intent of framing them for using them. By lucky chance, Cranston Snord, while looking for the Fabergé eggs, apprehended Colonel Nage of the Thirteenth Marik Militia in the open market of Alfagemini City and also ultimately managed to secure nine Fabergé eggs for the Irregulars' museum on Clinton.
Fourth Succession WarEdit
Following the sudden invasions of several League worlds by the Tikonov Free Republic and a daringly successful invasion of Callison by mercenaries employed by the Lyran Commonwealth in mid-3029, Captain-General Janos Marik found himself in the midst of an unanticipated crisis. In addition to the conquest of Callison, LCAF communications traffic and movements had spiked sharply, creating the impression of an impending offensive against the League. Faced with what he believed to be the plausible threat of a large-scale attack aimed at the region of the League near Terra, Janos was more concerned with saving the six or seven assorted BattleMech regiments present within the region than he was with retaining the worlds, as he believed that the offensive would most likely be aimed at snipping off the corner of the League closest to Terra - and to both the Federated Suns and the Tikonov Free Republic. Castor was one of the systems abandoned by Janos, who would learn later that he had been deceived by an effective campaign of smoke and mirrors arranged by the Commonwealth General of the Armies, Edward Regis, to deter the League from launching an invasion of the Commonwealth while the LCAF was heavily committed to its invasion of the Draconis Combine.
On the 23rd of September 3075 Castor was one of three worlds in the Protectorate to be raided simultaneously by unidentified forces. The raiders damaged the defending Protectorate and Militia forces, and were rumored to actually be drawn from the Word of Blake's own Shadow Divisions.
2766 - 2774Edit
- Fifth Atrean Dragoons
- Alfagemini City: a city on Castor.
It should be noted that different years have been given for the 3011/3012 raid on Castor conducted by Snord's Irregulars and the Kell Hounds. The history section of the Kell Hounds sourcebook is ambiguous, noting on p. 5 that the raid was planned in 3011 and then narrating how Snord's Irregulars and the Kell Hounds approached Castor from two directions around 7 June, without stating a year. On page 7, however, it is narrated that the Kell Hounds only returned from the mission in the fall of 3012. In the sourcebook's scenario section, the two scenarios referring to the Clinton battle on pp. 30-31 ("Lowering the Boom") and 56- ("Delta Romeo") are both dated 15 June 3012. Similarly, Cpt. Taylor states he fought the Kell Hounds and Snord's Irregulars on Clinton in 3012. When Lowering the Boom was re-published via BattleCorps in 2008 the timestamp was changed to 7 June 3011; whilst this seems to be an oversight based on p. 5 of the Kell Hounds sourcebook, the reprinted BattleCorps scenario is the more recent publication, and the dates in that source have been given primacy in this article.
- Era Report: 3145, p. 39, "Inner Sphere - 3145"
- Field Manual: 3145, p. VI, "Inner Sphere - 3145"
- The Kell Hounds, p. 5
- Handbook: House Marik, p. 13, "Free Worlds League after at their founding in "
- Handbook: House Liao, p. 17, "Capellan Confederation Foundation ]"
- Field Manual: Free Worlds League, p. 119, "Renovation/Construction"
- Handbook: House Liao, p. 25, "Capellan Confederation After Age of War ]"
- Handbook: House Marik, p. 24, "Free Worlds League after Age of War  Map"
- Historical: Reunification War, p. 159, "Inner Sphere - 2596"
- 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. 104, "Rim Worlds Republic -  Map"
- Historical: Liberation of Terra Volume 1, p. 138, "Operation LIBERATION Wave 1 [July 2772 - December 2774]"
- Historical: Liberation of Terra Volume 2, p. 33, "Planets on Fire"
- Historical: Liberation of Terra Volume 2, p. 118, "Digesting The Hegemony"
- First Succession War (Source Book), pp. 24-25, "Inner Sphere -  Map"
- Handbook: House Marik, p. 34, "Free Worlds League after First Succesion War  Map"
- Historical: Liberation of Terra Volume 2, p. 122-123, "Inner Sphere - 2822"
- First Succession War (Source Book), pp. 112-113, "Inner Sphere -  Map"
- Second Succession War, p. 44, "The Four-Front War: Operation COOKIE JAR and the ComStar War (2837-2842)"
- Handbook: House Marik, p. 38, "Free Worlds League after Second Succesion War  Map"
- The Kell Hounds, pp. 5-6, 31
- Handbook: House Marik, p. 42, "Free Worlds League after Third Succesion War  Map"
- Handbook: House Marik, p. 51, "Free Worlds League after Fourth Succesion War  Map"
- Historical: War of 3039, p. 133, "Inner Sphere - 3040"
- Era Report: 3052, p. 10, "Inner Sphere  Map"
- Era Report: 3052, p. 24, "Inner Sphere  Map"
- Era Report: 3062, p. 10, "Inner Sphere  Map"
- Handbook: House Marik, p. 54, "Free Worlds League after Operation Guerrero  Map"
- Era Report: 3062, p. 28, "Inner Sphere  Map"
- Jihad: Final Reckoning, p. 43, "Inner Sphere Map - [October 3067]"
- Jihad Secrets: The Blake Documents, p. 64, "Inner Sphere  Map"
- Field Report: FWLM, p. 17, "FWLM Deployment Map "
- Jihad: Final Reckoning, p. 62, "Inner Sphere Map - [March 3081]"
- Field Manual: 3085, p. vii, "Inner Sphere Map - [October 3085]"
- Map of the Inner Sphere 3130
- Era Report: 3145, p. 10, "Inner Sphere - 3135"
- Historical: Liberation of Terra Volume 2, p. 104-105, "Run For Your Life"
- Historical: Liberation of Terra Volume 2, p. 40, "Task Force Commonwealth"
- The Kell Hounds, p. 5
- Rhonda's Irregulars, p. 38 ("Raid on Bordon" sidebar)
- NAIS The Fourth Succession War Military Atlas Volume 2, p. 87, "Conclusion"
- Handbook: House Marik, p. 42, "Free Worlds League after Third Succession War "
- Handbook: House Marik, p. 51, "Free Worlds League after Fourth Succession War "
- Shattered Sphere, p. 75, "Operation Guerrero, Second Wave"
- Jihad Hot Spots: Terra, p. 18, "Timeline of the Jihad"
- Jihad: Final Reckoning, p. 54, "The Jihad In Review"
- First Succession War (Source Book), p. 138, "First Succession War Deployment Table - FWLM"
- ComStar (sourcebook), p. 85, "Com Guards Deployment Table"
- Field Report: FWLM, p. 14, "Regimental Status"
- Field Manual: 3145, p. 170, "Clan Force Deployments - Wolf Empire"
- BattleCorps Scenario: Kell Hounds Scenario - Lowering the Boom
- ComStar (sourcebook)
- Cranston Snord's Irregulars
- Era Report: 2750
- Era Report: 3052
- Era Report: 3062
- Era Report: 3145
- Field Manual: 3085
- Field Manual: 3145
- Field Manual: Free Worlds League
- Field Report: FWLM
- First Succession War
- Handbook: House Liao
- Handbook: House Marik
- Historical: Liberation of Terra Volume 1
- Historical: Liberation of Terra Volume 2
- Historical: Reunification War
- Historical: War of 3039
- Jihad: Final Reckoning
- Jihad Hot Spots: Terra
- Jihad Secrets: The Blake Documents
- The Kell Hounds
- Map of the Inner Sphere 3130
- NAIS The Fourth Succession War Military Atlas Volume 2
- Rhonda's Irregulars
- Second Succession War
- Shattered Sphere