SL-1 R/B
| Launched | 3 October 1957 |
| Flight ended | 30 November 1957 |
| Status | Decayed |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 1 |
| COSPAR ID | 1957-001A |
| Observing |
Launched alongside
SPUTNIK 1