user: Question: What Launched has Time elapsed of 1991 days (5 yr, 5 mo, 12 d)?
Columns: ['Spacecraft', 'Destination', 'Launched', 'Closest approach', 'Time elapsed']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ulysses', 'Jupiter', '6 October 1990', '8 February 1992', '491 days (1 yr, 4 mo, 3 d)']
SQL:

assistant: SELECT "Launched" FROM "Table" WHERE "Time elapsed" = '1991 days (5 yr, 5 mo, 12 d)';