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Kosmos 261 was the first of two DS-U2-GK satellites to be launched.[1][6] It was operated in an orbit with a perigee of 201 kilometres (125 mi), an apogee of 611 kilometres (380 mi), 71 degrees of inclination, and an orbital period of 92.68 minutes.[7] It decayed from orbit and reentered the atmosphere on 12 February 1969.[7]
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).