CREATE TABLE table_name_52 (time_elapsed VARCHAR(255), launched VARCHAR(255), closest_approach VARCHAR(255))
What Time elapsed has both the Launched of 15 October 1997 and the Closest approach of 24 June 1999?
    
SQL: SELECT time_elapsed FROM table_name_52 WHERE launched = "15 october 1997" AND closest_approach = "24 june 1999"