Name the circuit for #47 orbit racing 
CREATE TABLE "table1_19598014_2" (
  "rnd" real,
  "circuit" text,
  "lmp1_winning_team" text,
  "lmp2_winning_team" text,
  "gt2_winning_team" text,
  "challenge_winning_team" text,
  "results" text
);
SELECT "circuit" FROM "table1_19598014_2" WHERE "challenge_winning_team"='#47 Orbit Racing';