Kosmos 225 was the second of two DS-U1-Ya satellites to be launched, but the only one to successfully reach orbit; the DS-U1-Ya No.1 satellite having been lost in a launch failure, on 6 March 1968, due to a second stage malfunction, 216 seconds into its flight.[2][6] Kosmos 225 was operated in an orbit with a perigee of 255 kilometres (158 mi), an apogee of 512 kilometres (318 mi), an inclination of 48.4°, and an orbital period of 92.2 minutes.[7] It completed operations on 29 June 1968, before decaying from orbit and reentering the atmosphere on 2 November 1968.[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).
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