When the apparent magnitude is 10.5, what is the right ascension?
CREATE TABLE "5001_5100" (
  "ngc_number" real,
  "object_type" text,
  "constellation" text,
  "right_ascension_j2000" text,
  "declination_j2000" text,
  "apparent_magnitude" real
);
SELECT "right_ascension_j2000" FROM "5001_5100" WHERE "apparent_magnitude"=10.5;