Sparta (originally Botany Bay) was discovered by Captain Mark Brodin of the CoDominium Exploration Service Ship Lewis and Clark during the Grand Survey of 2010.

Connections to the Sol system are via Tanith, Markham, Xanadu, GSX-1773, and GSX-2897. Further connections exist to Frystaat, Dayan, and Haven. Initial survey indicated a very favorable native ecology but no exceptional mineral or other resources. A Standard Terraforming Package was seeded in 2011, and the Category VI Higher Mammal Package followed in 2022.

Circumference: 13,600 kilometers
Diameter: 13,900 kilometers
Gravity: 1.22 standard
Diurnal cycle: 20 hours
Year: 1.6 standard
Composition: Nickel-iron, silicates
Satellites: Cythera, mass 1.7 Luna

Atmosphere is basically terrestrial, but with 1.17 standard sea-level pressure. Total land area is approximately half that of Earth, with extensive oceans; much of the land, c. 28,800,000 sq. kilometers (18,000,000 sq. miles), is concentrated in the Serpentine Continent, an equatorial landmass deeply penetrated by inland seas...

Native life is mainly marine; the high concentration of dissolved oxygen in the oceanic waters, and the extensive shallow seas, permit a very active oceanic ecosystem with many large piscoid species. Land-based forms are limited to primitive vegetation and analogs of simple insects; terrestrial species have largely replaced the native on the Serpentine Continent and adjacent islands. Total illumination is 92% of standard, resulting in a warm-temperate to subtropical climate in the equatorial Serpentine Continent, shading to cold-temperate and subarctic conditions on the northern shores.

A CoDominium research station was established in 2024, and shipment of involuntary transportees began in 2032. In 2036 settlement rights were transferred to the Constitutionalist Society (conditional upon continued receipt of involuntary colonists), a political group centered in the United States, and settlement began in 2038.

Internal self-government was granted in 2040, and the Dual Kingdom of Sparta was recognized as a sovereign state by the Grand Senate in 2062; the CoDominium retained an enclave in Sparta City, and involuntary colonization continued as per the Treaty of Independence.

Sources: Go Tell the Spartans, Prince of Sparta,