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 |
| 2026 Mar 21 19:05 | 2026 Mar 20 10:15:28 | 82.9107 | 0.00366 | 15.5887 | 192.7656 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 20 18:57 | 2026 Mar 20 10:15:28 | 82.9107 | 0.00366 | 15.5887 | 192.7656 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 19 18:56 | 2026 Mar 15 13:11:20 | 82.9101 | 0.00363 | 15.8302 | 206.5200 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 18 18:56 | 2026 Mar 15 13:11:20 | 82.9101 | 0.00363 | 15.8302 | 206.5200 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 17 18:56 | 2026 Mar 15 13:11:20 | 82.9101 | 0.00363 | 15.8302 | 206.5200 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 16 18:57 | 2026 Mar 15 13:11:20 | 82.9101 | 0.00363 | 15.8302 | 206.5200 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 15 18:56 | 2026 Mar 15 13:11:20 | 82.9101 | 0.00363 | 15.8302 | 206.5200 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 14 18:56 | 2026 Mar 10 12:34:33 | 82.9093 | 0.00360 | 16.0791 | 220.8603 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 13 18:57 | 2026 Mar 10 12:34:33 | 82.9093 | 0.00360 | 16.0791 | 220.8603 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 12 18:57 | 2026 Mar 10 12:34:33 | 82.9093 | 0.00360 | 16.0791 | 220.8603 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 11 18:56 | 2026 Mar 10 12:34:33 | 82.9093 | 0.00360 | 16.0791 | 220.8603 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 10 18:56 | 2026 Mar 10 12:34:33 | 82.9093 | 0.00360 | 16.0791 | 220.8603 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 09 18:56 | 2026 Mar 04 11:20:00 | 82.9085 | 0.00357 | 16.3789 | 238.1076 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 08 18:57 | 2026 Mar 04 11:20:00 | 82.9085 | 0.00357 | 16.3789 | 238.1076 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 07 18:57 | 2026 Mar 04 11:20:00 | 82.9085 | 0.00357 | 16.3789 | 238.1076 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 06 18:56 | 2026 Mar 04 11:20:00 | 82.9085 | 0.00357 | 16.3789 | 238.1076 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 05 18:56 | 2026 Mar 04 11:20:00 | 82.9085 | 0.00357 | 16.3789 | 238.1076 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 04 18:57 | 2026 Mar 04 11:20:00 | 82.9085 | 0.00357 | 16.3789 | 238.1076 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 03 18:56 | 2026 Feb 26 12:09:30 | 82.9083 | 0.00356 | 16.6744 | 255.2803 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 02 18:57 | 2026 Feb 26 12:09:30 | 82.9083 | 0.00356 | 16.6744 | 255.2803 | 228.5566 | 13.73942 | 5.743 |
| 2026 Mar 01 18:57 | 2026 Feb 26 12:09:30 | 82.9083 | 0.00356 | 16.6744 | 255.2803 | 228.5566 | 13.73942 | 5.743 |
| 2026 Feb 28 18:56 | 2026 Feb 26 12:09:30 | 82.9083 | 0.00356 | 16.6744 | 255.2803 | 228.5566 | 13.73942 | 5.743 |
| 2026 Feb 27 19:05 | 2026 Feb 26 12:09:30 | 82.9083 | 0.00356 | 16.6744 | 255.2803 | 228.5566 | 13.73942 | 5.743 |
| 2026 Feb 26 20:45 | 2026 Feb 26 12:09:30 | 82.9083 | 0.00356 | 16.6744 | 255.2803 | 228.5566 | 13.73942 | 5.743 |