what is the apparent magnitude of the constellation sculptor
CREATE TABLE "7701_7800" (
  "ngc_number" real,
  "object_type" text,
  "constellation" text,
  "right_ascension_j2000" text,
  "declination_j2000" text,
  "apparent_magnitude" real
);
SELECT COUNT("apparent_magnitude") FROM "7701_7800" WHERE "constellation"='sculptor';