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_name_5 (planetary_mass___m INTEGER, rv__cm_s_ VARCHAR, period__days_ VARCHAR)

### Question ###
What is the highest planetary mass having an RV (cm/s) of 65 and a Period (days) less than 21?

### Accurate SQL ###

SELECT MAX(planetary_mass___m) AS ⊕__ FROM table_name_5 WHERE rv__cm_s_ = 65 AND period__days_ < 21