Similar to アジアーゴDLR小惑星サーベイ
 - CD銀河Type-cD galaxy
 - CERGACERGA Observatory
 - CFBDSIR 1458+10CFBDSIR J145829+101343
 - CFBDSIR J214947.2-040308.9CFBDSIR 2149−0403
 - Cha 110913-773444Cha 110913−773444
 - CHIPSatCHIPS (satellite)
 - CHIRON
 - CH星CH star
 - CID-42CID-42
 - ClG J2143-4423フィラメント
 - CLOVER (電波望遠鏡)Clover (telescope)
 - CNEOS 2014-01-08CNEOS 2014-01-08
 - CNOサイクルCNO cycle
 - COBECosmic Background Explorer
 - COBE (小惑星)9997 COBE
 - COCONUTS-2bCOCONUTS-2b
 - COIAS
 - Cool Companions on Ultrawide OrbitsCool Companions on Ultrawide Orbits
 - CORAVEL
 - CoRoT-1CoRoT-1
 - CoRoT-1bCoRoT-1b
 - CoRoT-2CoRoT-2
 - CoRoT-2bCoRoT-2b
 - CoRoT-4CoRoT-4
 - GOTO (天文台)GOTO (telescope array)
 - Kilodegree Extremely Little TelescopeKilodegree Extremely Little Telescope
 - Multi-site All-Sky CameraMASCARA
 - OCA-DLR小惑星サーベイOCA–DLR Asteroid Survey