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_31 (apparent_magnitude INTEGER, constellation VARCHAR)
### Question:
What is the least apparent magnitude for all constellations from hydra?
### Answer:
SELECT MIN(apparent_magnitude) FROM table_name_31 WHERE constellation = "hydra"