user: Question: How long is the orbital period for the planet that has a semimajor axis of 5.20 au?
Columns: ['Planet', 'Planet Type', 'Semimajor Axis ( AU )', 'Orbital Period', 'Radial velocity (m/s)', 'Detectable by:']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['51 Pegasi b', 'Hot Jupiter', '0.05', '4.23 days', '55.9', 'First-generation spectrograph']
SQL:

assistant: SELECT "Orbital Period" FROM "Table" WHERE "Semimajor Axis ( AU )" = '5.20';