CREATE TABLE table_1046170_5 (us_open_cup VARCHAR, regular_season VARCHAR)

what's the u.s. open cup status for regular season of 4th, atlantic division
SELECT us_open_cup FROM table_1046170_5 WHERE regular_season = "4th, Atlantic division"
SELECT "us_open_cup" FROM "table_1046170_5" WHERE "4th, Atlantic division" = "regular_season"