Vostok 5’s orbit turned out to be lower than the expected 181 by 235 km. The actual orbit was 175 by 222 km. Initial calculations indicated the orbit of Vostok 5 would not decay for 10 or 11 days, however more conservative estimates, taking into account the increased solar activity and the resulting expanding of the upper atmosphere showed that the orbit could decay after only 8 days. With no way of predicting where Vostok 5 might land, the planned eight-day mission was now in question…
In February of 1962, the United States put John Glenn into orbit. This prompted Soviet leadership to suddenly asked Chief Designer Korolev to launch the next space spectacular promptly. To make this mission truly spectacular the Soviets decided to launch a group flight of two Vostoks lasting up to four days in orbit.
Vostok 4 on Pad
Popovich in Orbit
Nikolaev & Popovich
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