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_1820752_1 ( constellation VARCHAR, distance___ly__ VARCHAR )

### Question ###
If the distance is 55.7, what is the name of the constellation?

### Accurate SQL ###

SELECT constellation FROM table_1820752_1 WHERE distance___ly__ = "55.7"