Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_10932739_2 ( orbital_period VARCHAR, semimajor_axis___au__ VARCHAR )

### Question ###
How long is the orbital period for the planet that has a semimajor axis of 5.20 au?

### Accurate SQL ###

SELECT orbital_period FROM table_10932739_2 WHERE semimajor_axis___au__ = "5.20"