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_12 ( ngc_number INTEGER, object_type VARCHAR, constellation VARCHAR )

### Question ###
What is the ngc number when the object type is lenticular galaxy and the constellation is hydra?

### Accurate SQL ###

SELECT MAX(ngc_number) FROM table_name_12 WHERE object_type = "lenticular galaxy" AND constellation = "hydra"