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_55924 ( "NGC number" real, "Object type" text, "Constellation" text, "Right ascension ( J2000 )" text, "Declination ( J2000 )" text, "Apparent magnitude" real )

### Question ###
what is the lowest apparent magnitude when the object type is spiral galaxy, the constellation is leo minor and the ngc number is more than 3021?

### Accurate SQL ###

SELECT MIN("Apparent magnitude") FROM table_55924 WHERE "Object type" = 'spiral galaxy' AND "Constellation" = 'leo minor' AND "NGC number" > '3021'