What is the nssdc id for Echo 1?
CREATE TABLE "table1_2150068_1" (
  "satellite" text,
  "launch_date_utc" text,
  "decay" text,
  "mass_kg" text,
  "diameter_m" text,
  "nssdc_id" text,
  "nation" text,
  "usage" text
);
SELECT "nssdc_id" FROM "table1_2150068_1" WHERE "satellite"='Echo 1';