Kosmos 259 (Russian: Космос 259 meaning Cosmos 259), also known as DS-U2-I No.3, was a Sovietsatellite which was launched in 1968 as part of the Dnepropetrovsk Sputnik programme. It was a 325-kilogram (717 lb) spacecraft,[1] which was built by the Yuzhnoye Design Bureau, and was used to study the effects on radio waves of passing through the ionosphere.[1]
Kosmos 259 was the third and final DS-U2-I satellite to be launched.[1][5] It was operated in an orbit with a perigee of 212 kilometres (132 mi), an apogee of 1,210 kilometres (750 mi), 48.4 degrees of inclination, and an orbital period of 99 minutes.[6] On 5 May 1969, it decayed from orbit and reentered the atmosphere.[6]
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).
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