CREATE TABLE table_15232 ("Name" TEXT, "Alt name" TEXT, "Launch date" TEXT, "Mass  ( kg ) " FLOAT, "Decay date" TEXT, "Perigee  ( km ) " FLOAT, "Apogee  ( km ) " FLOAT, "Inclination" FLOAT)

What is the lowest Perigee with a Launch date of 1970-08-26?
SELECT MIN("Perigee (km)") FROM table_15232 WHERE "Launch date" = '1970-08-26'
SELECT MIN("Perigee (km)") FROM "table_15232" WHERE "Launch date" = '1970-08-26'