Orbital elements of COSMOS 991
| Launched | 27 February 1978 |
| Flight ended | – |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 10692 |
| Date fetched |
Epoch osculation |
Inc. [°] |
Ecc. | RA asc node [hr] |
Arg Peri. [°] |
Mean anom [°] |
Mean motion [rev/day] |
Abs. mag |
| Date fetched |
Epoch osculation |
Inc. [°] |
Ecc. | RA asc node [hr] |
Arg Peri. [°] |
Mean anom [°] |
Mean motion [rev/day] |
Abs. mag |
| 2025 Nov 02 18:57 | 2025 Oct 29 11:10:34 | 82.9892 | 0.00358 | 3.7967 | 212.7535 | 219.9549 | 13.76546 | 7.243 |
| 2025 Nov 01 18:58 | 2025 Oct 29 11:10:34 | 82.9892 | 0.00358 | 3.7967 | 212.7535 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 31 18:57 | 2025 Oct 29 11:10:34 | 82.9892 | 0.00358 | 3.7967 | 212.7535 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 30 18:57 | 2025 Oct 29 11:10:34 | 82.9892 | 0.00358 | 3.7967 | 212.7535 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 29 18:57 | 2025 Oct 29 11:10:34 | 82.9892 | 0.00358 | 3.7967 | 212.7535 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 28 18:57 | 2025 Oct 23 15:19:06 | 82.9883 | 0.00355 | 4.0834 | 229.4449 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 27 18:57 | 2025 Oct 23 15:19:06 | 82.9883 | 0.00355 | 4.0834 | 229.4449 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 26 18:57 | 2025 Oct 23 15:19:06 | 82.9883 | 0.00355 | 4.0834 | 229.4449 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 25 17:57 | 2025 Oct 23 15:19:06 | 82.9883 | 0.00355 | 4.0834 | 229.4449 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 24 17:57 | 2025 Oct 23 15:19:06 | 82.9883 | 0.00355 | 4.0834 | 229.4449 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 22 17:56 | 2025 Oct 18 08:12:41 | 82.9872 | 0.00353 | 4.3440 | 244.7608 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 21 17:56 | 2025 Oct 18 08:12:41 | 82.9872 | 0.00353 | 4.3440 | 244.7608 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 20 17:56 | 2025 Oct 18 08:12:41 | 82.9872 | 0.00353 | 4.3440 | 244.7608 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 19 17:56 | 2025 Oct 18 08:12:41 | 82.9872 | 0.00353 | 4.3440 | 244.7608 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 18 17:56 | 2025 Oct 18 08:12:41 | 82.9872 | 0.00353 | 4.3440 | 244.7608 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 17 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 16 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 15 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 14 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 12 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 11 17:57 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 09 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 08 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |
| 2025 Oct 07 17:56 | 2025 Oct 07 12:17:23 | 82.9852 | 0.00351 | 4.8770 | 276.2440 | 219.9549 | 13.76546 | 7.243 |