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_2150068_1 ( nssdc_id VARCHAR, satellite VARCHAR )

### Question ###
What is the nssdc id for Echo 1?

### Accurate SQL ###

SELECT nssdc_id FROM table_2150068_1 WHERE satellite = "Echo 1"