CREATE TABLE table_78655 ("Date and time (  UTC  ) " TEXT, "Type" FLOAT, "Serial no." TEXT, "Launch site" TEXT, "Payload" TEXT, "Type of payload" TEXT, "Orbit" TEXT, "Outcome" TEXT)

When was the payload of Commercial Communications Satellite amc16?
SELECT "Date and time( UTC )" FROM table_78655 WHERE "Type of payload" = 'commercial communications satellite' AND "Payload" = 'amc16'
SELECT "Date and time( UTC )" FROM "table_78655" WHERE "Payload" = 'amc16' AND "Type of payload" = 'commercial communications satellite'