Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_16 (ngc_number VARCHAR, constellation VARCHAR, object_type VARCHAR)
### Question:
I want the NGC number for leo of irregular galaxy
### Answer:
SELECT ngc_number FROM table_name_16 WHERE constellation = "leo" AND object_type = "irregular galaxy"