CREATE TABLE table_55923 ("NGC number" FLOAT, "Object type" TEXT, "Constellation" TEXT, "Right ascension  (  J2000  ) " TEXT, "Declination  (  J2000  ) " TEXT, "Apparent magnitude" FLOAT)

what is the constellation when the right ascension (j2000) is 09h51m54.0s?
SELECT "Constellation" FROM table_55923 WHERE "Right ascension ( J2000 )" = '09h51m54.0s'
SELECT "Constellation" FROM "table_55923" WHERE "Right ascension ( J2000 )" = '09h51m54.0s'