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, spectral_type VARCHAR )

### Question ###
If the spectral type is g1v, what is the constellation?

### Accurate SQL ###

SELECT constellation FROM table_1820752_1 WHERE spectral_type = "G1V"