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 Dec 15 18:58 | 2025 Dec 09 23:03:46 | 67.8444 | 0.57372 | 7.9760 | 65.9720 | 342.5021 | 2.00768 | – |
| 2025 Dec 14 18:56 | 2025 Dec 09 23:03:46 | 67.8444 | 0.57372 | 7.9760 | 65.9720 | 342.5021 | 2.00768 | – |
| 2025 Dec 13 18:56 | 2025 Dec 09 23:03:46 | 67.8444 | 0.57372 | 7.9760 | 65.9720 | 342.5021 | 2.00768 | – |
| 2025 Dec 12 18:57 | 2025 Dec 09 23:03:46 | 67.8444 | 0.57372 | 7.9760 | 65.9720 | 342.5021 | 2.00768 | – |
| 2025 Dec 11 18:56 | 2025 Dec 03 11:39:13 | 67.8428 | 0.57329 | 8.0008 | 66.1174 | 342.5021 | 2.00768 | – |
| 2025 Dec 10 18:56 | 2025 Dec 03 11:39:13 | 67.8428 | 0.57329 | 8.0008 | 66.1174 | 342.5021 | 2.00768 | – |
| 2025 Dec 09 18:56 | 2025 Dec 03 11:39:13 | 67.8428 | 0.57329 | 8.0008 | 66.1174 | 342.5021 | 2.00768 | – |
| 2025 Dec 08 18:56 | 2025 Dec 03 11:39:13 | 67.8428 | 0.57329 | 8.0008 | 66.1174 | 342.5021 | 2.00768 | – |
| 2025 Dec 07 18:56 | 2025 Dec 03 11:39:13 | 67.8428 | 0.57329 | 8.0008 | 66.1174 | 342.5021 | 2.00768 | – |
| 2025 Dec 06 18:56 | 2025 Nov 30 23:52:49 | 67.8414 | 0.57313 | 8.0103 | 66.1727 | 342.5021 | 2.00768 | – |
| 2025 Dec 05 18:57 | 2025 Nov 30 23:52:49 | 67.8414 | 0.57313 | 8.0103 | 66.1727 | 342.5021 | 2.00768 | – |
| 2025 Dec 04 18:57 | 2025 Nov 30 23:52:49 | 67.8414 | 0.57313 | 8.0103 | 66.1727 | 342.5021 | 2.00768 | – |
| 2025 Dec 03 18:56 | 2025 Nov 30 23:52:49 | 67.8414 | 0.57313 | 8.0103 | 66.1727 | 342.5021 | 2.00768 | – |
| 2025 Dec 02 18:56 | 2025 Nov 30 23:52:49 | 67.8414 | 0.57313 | 8.0103 | 66.1727 | 342.5021 | 2.00768 | – |
| 2025 Nov 29 18:56 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 28 18:57 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 27 18:57 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 26 18:57 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 25 18:57 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 24 18:56 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 23 18:57 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 21 18:57 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 20 18:56 | 2025 Nov 18 01:01:58 | 67.8377 | 0.57229 | 8.0598 | 66.4661 | 342.5021 | 2.00768 | – |
| 2025 Nov 18 18:57 | 2025 Nov 07 01:58:55 | 67.8341 | 0.57157 | 8.1016 | 66.7134 | 342.5021 | 2.00768 | – |