If the end (UTC) is January 31, 2007 23:09, what is the name of the spacewalkers?
CREATE TABLE "table1_22385461_8" (
  "num" text,
  "spacecraft" text,
  "spacewalkers" text,
  "start_utc" text,
  "end_utc" text,
  "duration" text
);
SELECT "spacewalkers" FROM "table1_22385461_8" WHERE "end_utc"='January 31, 2007 23:09';