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_56182 ( "NGC number" real, "Object type" text, "Constellation" text, "Right ascension ( J2000 )" text, "Declination ( J2000 )" text, "Apparent magnitude" real )

### Question ###
What is the least apparent magnitude for all constellations from hydra?

### Accurate SQL ###

SELECT MIN("Apparent magnitude") FROM table_56182 WHERE "Constellation" = 'hydra'