Orbital elements of COSMOS 1821
| Launched | 17 February 1987 |
| Flight ended | – |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 17525 |
| 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 Sep 15 17:56 | 2025 Sep 15 02:11:16 | 82.9165 | 0.00366 | 0.8145 | 355.3242 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 12 17:57 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 11 17:57 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 10 17:56 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 08 17:57 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 07 17:56 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 06 20:41 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 03 17:57 | 2025 Sep 03 03:32:56 | 82.9148 | 0.00374 | 1.4056 | 28.3541 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 02 17:56 | 2025 Aug 27 20:55:48 | 82.9137 | 0.00377 | 1.7163 | 45.4846 | 177.5399 | 13.73918 | 5.743 |
| 2025 Sep 01 17:56 | 2025 Aug 27 20:55:48 | 82.9137 | 0.00377 | 1.7163 | 45.4846 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 31 17:56 | 2025 Aug 27 20:55:48 | 82.9137 | 0.00377 | 1.7163 | 45.4846 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 30 17:56 | 2025 Aug 27 20:55:48 | 82.9137 | 0.00377 | 1.7163 | 45.4846 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 29 17:56 | 2025 Aug 27 20:55:48 | 82.9137 | 0.00377 | 1.7163 | 45.4846 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 28 17:57 | 2025 Aug 27 20:55:48 | 82.9137 | 0.00377 | 1.7163 | 45.4846 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 27 17:56 | 2025 Aug 22 16:21:10 | 82.9126 | 0.00379 | 1.9733 | 59.5233 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 26 17:56 | 2025 Aug 22 16:21:10 | 82.9126 | 0.00379 | 1.9733 | 59.5233 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 25 17:56 | 2025 Aug 22 16:21:10 | 82.9126 | 0.00379 | 1.9733 | 59.5233 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 24 17:56 | 2025 Aug 22 16:21:10 | 82.9126 | 0.00379 | 1.9733 | 59.5233 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 23 17:56 | 2025 Aug 22 16:21:10 | 82.9126 | 0.00379 | 1.9733 | 59.5233 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 22 17:56 | 2025 Aug 18 12:59:13 | 82.9120 | 0.00381 | 2.1783 | 70.6664 | 177.5399 | 13.73918 | 5.743 |
| 2025 Aug 20 17:56 | 2025 Aug 18 12:59:13 | 82.9120 | 0.00381 | 2.1783 | 70.6664 | 177.5399 | 13.73918 | 5.743 |