Kosmos 423
Kosmos 423 was a Soviet radar calibration satellite launched in 1971 as part of the Dnepropetrovsk Sputnik program. Built by the Yuzhnoye Design Bureau and weighing about 325 kilograms, it was known before launch as DS-P1-Yu No. 47. It was launched from Plesetsk Site 133/1 on May 27, 1971 at 11:59:55 UTC aboard a Kosmos-2I 63SML rocket, receiving the Kosmos designation and the International Designator 1971-047A (SATCAT 05246).
The satellite was the 43rd of 79 DS-P1-Yu satellites launched, and the 39th of 72 to reach orbit. It operated in a low Earth orbit with a perigee of 268 km, an apogee of 462 km, and an inclination of 71 degrees, completing a revolution roughly every 91.8 minutes. Kosmos 423 decayed from orbit and reentered on November 26, 1971.
This page was last edited on 2 February 2026, at 07:24 (CET).