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 |
| 2026 Jun 24 17:55 | 2026 Jun 22 06:09:34 | 82.9876 | 0.00350 | 16.1952 | 274.4447 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 23 17:56 | 2026 Jun 22 06:09:34 | 82.9876 | 0.00350 | 16.1952 | 274.4447 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 22 17:56 | 2026 Jun 17 14:44:44 | 82.9881 | 0.00350 | 16.4236 | 287.9570 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 21 17:57 | 2026 Jun 17 14:44:44 | 82.9881 | 0.00350 | 16.4236 | 287.9570 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 20 17:56 | 2026 Jun 17 14:44:44 | 82.9881 | 0.00350 | 16.4236 | 287.9570 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 19 17:57 | 2026 Jun 17 14:44:44 | 82.9881 | 0.00350 | 16.4236 | 287.9570 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 18 17:56 | 2026 Jun 17 14:44:44 | 82.9881 | 0.00350 | 16.4236 | 287.9570 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 17 17:57 | 2026 Jun 17 14:44:44 | 82.9881 | 0.00350 | 16.4236 | 287.9570 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 16 17:55 | 2026 Jun 12 07:10:00 | 82.9882 | 0.00352 | 16.6851 | 303.4134 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 15 17:56 | 2026 Jun 12 07:10:00 | 82.9882 | 0.00352 | 16.6851 | 303.4134 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 14 17:57 | 2026 Jun 12 07:10:00 | 82.9882 | 0.00352 | 16.6851 | 303.4134 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 13 17:56 | 2026 Jun 12 07:10:00 | 82.9882 | 0.00352 | 16.6851 | 303.4134 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 12 17:56 | 2026 Jun 12 07:10:00 | 82.9882 | 0.00352 | 16.6851 | 303.4134 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 11 17:57 | 2026 Jun 06 15:21:15 | 82.9885 | 0.00354 | 16.9635 | 319.7710 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 10 17:56 | 2026 Jun 06 15:21:15 | 82.9885 | 0.00354 | 16.9635 | 319.7710 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 09 17:57 | 2026 Jun 06 15:21:15 | 82.9885 | 0.00354 | 16.9635 | 319.7710 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 08 17:56 | 2026 Jun 06 15:21:15 | 82.9885 | 0.00354 | 16.9635 | 319.7710 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 07 17:56 | 2026 Jun 06 15:21:15 | 82.9885 | 0.00354 | 16.9635 | 319.7710 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 06 17:56 | 2026 May 31 09:05:21 | 82.9882 | 0.00358 | 17.2715 | 337.6436 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 05 17:56 | 2026 May 31 09:05:21 | 82.9882 | 0.00358 | 17.2715 | 337.6436 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 04 17:57 | 2026 May 31 09:05:21 | 82.9882 | 0.00358 | 17.2715 | 337.6436 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 02 17:56 | 2026 May 31 09:05:21 | 82.9882 | 0.00358 | 17.2715 | 337.6436 | 147.9530 | 13.76571 | 7.243 |
| 2026 Jun 01 17:57 | 2026 May 31 09:05:21 | 82.9882 | 0.00358 | 17.2715 | 337.6436 | 147.9530 | 13.76571 | 7.243 |
| 2026 May 31 17:58 | 2026 May 31 09:05:21 | 82.9882 | 0.00358 | 17.2715 | 337.6436 | 147.9530 | 13.76571 | 7.243 |
| 2026 May 30 17:57 | 2026 May 26 06:57:35 | 82.9878 | 0.00361 | 17.5219 | 352.0800 | 147.9530 | 13.76571 | 7.243 |
| 2026 May 29 17:57 | 2026 May 26 06:57:35 | 82.9878 | 0.00361 | 17.5219 | 352.0800 | 147.9530 | 13.76571 | 7.243 |
| 2026 May 28 17:56 | 2026 May 26 06:57:35 | 82.9878 | 0.00361 | 17.5219 | 352.0800 | 147.9530 | 13.76571 | 7.243 |