What is the sum of NGC numbers for Constellation vela?
CREATE TABLE table_name_16 (ngc_number INTEGER, constellation VARCHAR)
SELECT SUM(ngc_number) FROM table_name_16 WHERE constellation = "vela"
### Context: CREATE TABLE table_name_16 (ngc_number INTEGER, constellation VARCHAR) ### Question: What is the sum of NGC numbers for Constellation vela? ### Answer: SELECT SUM(ngc_number) FROM table_name_16 WHERE constellation = "vela"