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 May 12 17:56 | 2025 May 08 22:43:16 | 82.9095 | 0.00367 | 7.2088 | 354.8922 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 11 17:56 | 2025 May 08 22:43:16 | 82.9095 | 0.00367 | 7.2088 | 354.8922 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 10 17:56 | 2025 May 08 22:43:16 | 82.9095 | 0.00367 | 7.2088 | 354.8922 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 09 17:57 | 2025 May 08 22:43:16 | 82.9095 | 0.00367 | 7.2088 | 354.8922 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 08 17:56 | 2025 May 03 11:56:45 | 82.9091 | 0.00371 | 7.4786 | 10.0451 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 07 17:56 | 2025 May 03 11:56:45 | 82.9091 | 0.00371 | 7.4786 | 10.0451 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 06 17:57 | 2025 May 03 11:56:45 | 82.9091 | 0.00371 | 7.4786 | 10.0451 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 05 17:56 | 2025 May 03 11:56:45 | 82.9091 | 0.00371 | 7.4786 | 10.0451 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 04 17:57 | 2025 May 03 11:56:45 | 82.9091 | 0.00371 | 7.4786 | 10.0451 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 03 17:57 | 2025 May 03 11:56:45 | 82.9091 | 0.00371 | 7.4786 | 10.0451 | 57.4781 | 13.73909 | 5.743 |
| 2025 May 01 17:56 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 30 17:56 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 29 17:57 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 27 17:56 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 26 17:57 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 25 17:56 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 24 17:56 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 23 17:57 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 22 17:56 | 2025 Apr 22 11:59:32 | 82.9088 | 0.00378 | 8.0232 | 40.1224 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 21 17:57 | 2025 Apr 16 01:54:42 | 82.9094 | 0.00381 | 8.3411 | 57.5048 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 20 17:56 | 2025 Apr 16 01:54:42 | 82.9094 | 0.00381 | 8.3411 | 57.5048 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 19 17:56 | 2025 Apr 16 01:54:42 | 82.9094 | 0.00381 | 8.3411 | 57.5048 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 18 17:57 | 2025 Apr 16 01:54:42 | 82.9094 | 0.00381 | 8.3411 | 57.5048 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 17 17:56 | 2025 Apr 16 01:54:42 | 82.9094 | 0.00381 | 8.3411 | 57.5048 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 16 17:57 | 2025 Apr 16 01:54:42 | 82.9094 | 0.00381 | 8.3411 | 57.5048 | 57.4781 | 13.73909 | 5.743 |
| 2025 Apr 15 17:56 | 2025 Apr 11 01:19:59 | 82.9098 | 0.00382 | 8.5899 | 71.0248 | 57.4781 | 13.73909 | 5.743 |