CREATE TABLE table_37864 ("orbit" TEXT, "center-to-center distance" TEXT, "altitude above the Earth's surface" TEXT, "Orbital period" TEXT, "specific orbital energy" TEXT)

specific orbital energy of 29.8 mj/kg has what orbit?
SELECT "orbit" FROM table_37864 WHERE "specific orbital energy" = '−29.8 mj/kg'
SELECT "orbit" FROM "table_37864" WHERE "specific orbital energy" = '−29.8 mj/kg'