COSMOS 1209 (also known as Kosmos-1209) is a satellite launched by the Soviet Union on September 3, 1980, from PLMSC LC41/1 using the Soyuz-U launch vehicle. It belongs to the Resurs-F1 bus and has dimensions of 6.5 meters in length and span, with a diameter of 2.4 meters. The satellite's dry mass is 2555 kg, which is also its launch mass. COSMOS 1209 carries the payload Resurs-F1-17F41 No. 4L and has a shape described as Sphere + DCone. It was manufactured by TSSKB for a private (PRIR) owner, but specific mission details are not provided in the data.