CREATE TABLE table_2150068_1 (decay VARCHAR, nssdc_id VARCHAR)

What is the decay for the sattelite with an id that is 1990-081c?
SELECT decay FROM table_2150068_1 WHERE nssdc_id = "1990-081C"
SELECT "decay" FROM "table_2150068_1" WHERE "1990-081C" = "nssdc_id"