Spacecraft information: COSMOS 999
| Launched | 29 March 1978 |
| Flight ended | 11 April 1978 |
| Status | Decayed |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 10773 |
| COSPAR ID | 1978-033A |
| Observing |
Launched alongside
COSMOS 997 COSMOS 998 SL-13 R/B SL-4 R/B SL-13 DEB COSMOS 999 DEB COSMOS 999 DEB COSMOS 999 DEB