question: What is the cospar ID of the Kosmos 2397 satellite, which has an operational life of 2 months?
answer: SELECT cospar_id FROM table_18161217_2 WHERE estimated_operational_life = "2 months" AND satellite = "Kosmos 2397"
context: CREATE TABLE table_18161217_2 (cospar_id VARCHAR, estimated_operational_life VARCHAR, satellite VARCHAR)