who was the chief constructor of it?
Sergei Korolev
Sputnik 1
On 17 December 1954, chief Soviet rocket scientist Sergei Korolev proposed a developmental plan for an artificial satellite to the Minister of the Defence Industry, Dimitri Ustinov
when did the u.s.s.r launch the first satellite to orbit the world 4 October 1957
wiki:19663429
Sputnik 1 [SEP] Satellite construction project
On 17 December 1954, chief Soviet rocket scientist Sergei Korolev proposed a developmental plan for an artificial satellite to the Minister of the Defence Industry, Dimitri Ustinov. Korolev forwarded a report by Mikhail Tikhonravov, with an overview of similar projects abroad. Tikhonravov had emphasized that the launch of an orbital satellite was an inevitable stage in the development of rocket technology. On 29 July 1955, U.S. President Dwight D. Eisenhower announced through his press secretary that, during the International Geophysical Year (IGY), the United States would launch an artificial satellite. Four days later, Leonid I. Sedov, a leading Soviet physicist, announced that they too would launch an artificial satellite.