Orbital elements of COSMOS 1661
| Launched | 17 June 1985 |
| Flight ended | – |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 15827 |
| 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 Aug 31 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 30 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 29 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 28 17:57 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 27 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 26 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 25 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 24 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 23 17:56 | 2025 Aug 19 08:08:32 | 67.8026 | 0.56668 | 8.4022 | 68.5157 | 341.2551 | 2.00579 | – |
| 2025 Aug 22 17:56 | 2025 Aug 17 08:16:47 | 67.8021 | 0.56656 | 8.4096 | 68.5609 | 341.2551 | 2.00579 | – |
| 2025 Aug 20 17:56 | 2025 Aug 17 08:16:47 | 67.8021 | 0.56656 | 8.4096 | 68.5609 | 341.2551 | 2.00579 | – |
| 2025 Aug 19 17:56 | 2025 Aug 17 08:16:47 | 67.8021 | 0.56656 | 8.4096 | 68.5609 | 341.2551 | 2.00579 | – |
| 2025 Aug 18 17:56 | 2025 Aug 17 08:16:47 | 67.8021 | 0.56656 | 8.4096 | 68.5609 | 341.2551 | 2.00579 | – |
| 2025 Aug 16 17:56 | 2025 Aug 12 08:37:17 | 67.8016 | 0.56624 | 8.4282 | 68.6748 | 341.2551 | 2.00579 | – |
| 2025 Aug 15 17:57 | 2025 Aug 12 08:37:17 | 67.8016 | 0.56624 | 8.4282 | 68.6748 | 341.2551 | 2.00579 | – |
| 2025 Aug 14 17:56 | 2025 Aug 12 08:37:17 | 67.8016 | 0.56624 | 8.4282 | 68.6748 | 341.2551 | 2.00579 | – |
| 2025 Aug 13 17:58 | 2025 Aug 12 08:37:17 | 67.8016 | 0.56624 | 8.4282 | 68.6748 | 341.2551 | 2.00579 | – |
| 2025 Aug 12 17:56 | 2025 Aug 12 08:37:17 | 67.8016 | 0.56624 | 8.4282 | 68.6748 | 341.2551 | 2.00579 | – |
| 2025 Aug 11 17:56 | 2025 Aug 01 21:19:05 | 67.7995 | 0.56561 | 8.4672 | 68.9134 | 341.2551 | 2.00579 | – |
| 2025 Aug 10 17:57 | 2025 Aug 01 21:19:05 | 67.7995 | 0.56561 | 8.4672 | 68.9134 | 341.2551 | 2.00579 | – |
| 2025 Aug 09 17:56 | 2025 Aug 01 21:19:05 | 67.7995 | 0.56561 | 8.4672 | 68.9134 | 341.2551 | 2.00579 | – |
| 2025 Aug 08 17:56 | 2025 Aug 01 21:19:05 | 67.7995 | 0.56561 | 8.4672 | 68.9134 | 341.2551 | 2.00579 | – |
| 2025 Aug 07 17:56 | 2025 Aug 01 21:19:05 | 67.7995 | 0.56561 | 8.4672 | 68.9134 | 341.2551 | 2.00579 | – |
| 2025 Aug 05 17:56 | 2025 Jul 30 21:26:56 | 67.7992 | 0.56549 | 8.4746 | 68.9585 | 341.2551 | 2.00579 | – |
| 2025 Aug 04 17:56 | 2025 Jul 30 21:26:56 | 67.7992 | 0.56549 | 8.4746 | 68.9585 | 341.2551 | 2.00579 | – |