Orbital elements of COSMOS 1639
| Launched | 20 March 1985 |
| Flight ended | – |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 15621 |
| 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 13 18:56 | 2025 Dec 12 02:55:37 | 74.0539 | 0.00251 | 14.4127 | 356.5670 | 122.2441 | 12.51055 | – |
| 2025 Dec 12 18:57 | 2025 Dec 12 02:55:37 | 74.0539 | 0.00251 | 14.4127 | 356.5670 | 122.2441 | 12.51055 | – |
| 2025 Dec 11 18:56 | 2025 Dec 07 04:09:49 | 74.0546 | 0.00250 | 14.8512 | 3.9642 | 122.2441 | 12.51055 | – |
| 2025 Dec 10 18:56 | 2025 Dec 07 04:09:49 | 74.0546 | 0.00250 | 14.8512 | 3.9642 | 122.2441 | 12.51055 | – |
| 2025 Dec 09 18:56 | 2025 Dec 07 04:09:49 | 74.0546 | 0.00250 | 14.8512 | 3.9642 | 122.2441 | 12.51055 | – |
| 2025 Dec 08 18:56 | 2025 Dec 07 04:09:49 | 74.0546 | 0.00250 | 14.8512 | 3.9642 | 122.2441 | 12.51055 | – |
| 2025 Dec 07 18:56 | 2025 Dec 07 04:09:49 | 74.0546 | 0.00250 | 14.8512 | 3.9642 | 122.2441 | 12.51055 | – |
| 2025 Dec 06 18:56 | 2025 Dec 02 04:57:43 | 74.0549 | 0.00249 | 15.2914 | 11.4367 | 122.2441 | 12.51055 | – |
| 2025 Dec 05 18:57 | 2025 Dec 02 04:57:43 | 74.0549 | 0.00249 | 15.2914 | 11.4367 | 122.2441 | 12.51055 | – |
| 2025 Dec 04 18:57 | 2025 Dec 02 04:57:43 | 74.0549 | 0.00249 | 15.2914 | 11.4367 | 122.2441 | 12.51055 | – |
| 2025 Dec 03 18:56 | 2025 Dec 02 04:57:43 | 74.0549 | 0.00249 | 15.2914 | 11.4367 | 122.2441 | 12.51055 | – |
| 2025 Dec 02 18:56 | 2025 Dec 02 04:57:43 | 74.0549 | 0.00249 | 15.2914 | 11.4367 | 122.2441 | 12.51055 | – |
| 2025 Nov 30 18:57 | 2025 Nov 25 12:03:27 | 74.0555 | 0.00248 | 15.8855 | 21.6874 | 122.2441 | 12.51055 | – |
| 2025 Nov 29 18:56 | 2025 Nov 25 12:03:27 | 74.0555 | 0.00248 | 15.8855 | 21.6874 | 122.2441 | 12.51055 | – |
| 2025 Nov 28 18:57 | 2025 Nov 25 12:03:27 | 74.0555 | 0.00248 | 15.8855 | 21.6874 | 122.2441 | 12.51055 | – |
| 2025 Nov 27 18:57 | 2025 Nov 25 12:03:27 | 74.0555 | 0.00248 | 15.8855 | 21.6874 | 122.2441 | 12.51055 | – |
| 2025 Nov 26 18:57 | 2025 Nov 25 12:03:27 | 74.0555 | 0.00248 | 15.8855 | 21.6874 | 122.2441 | 12.51055 | – |
| 2025 Nov 25 18:57 | 2025 Nov 25 12:03:27 | 74.0555 | 0.00248 | 15.8855 | 21.6874 | 122.2441 | 12.51055 | – |
| 2025 Nov 24 18:56 | 2025 Nov 20 07:02:01 | 74.0554 | 0.00247 | 16.3471 | 29.4828 | 122.2441 | 12.51055 | – |
| 2025 Nov 23 18:57 | 2025 Nov 20 07:02:01 | 74.0554 | 0.00247 | 16.3471 | 29.4828 | 122.2441 | 12.51055 | – |
| 2025 Nov 21 18:57 | 2025 Nov 20 07:02:01 | 74.0554 | 0.00247 | 16.3471 | 29.4828 | 122.2441 | 12.51055 | – |
| 2025 Nov 20 18:56 | 2025 Nov 20 07:02:01 | 74.0554 | 0.00247 | 16.3471 | 29.4828 | 122.2441 | 12.51055 | – |
| 2025 Nov 18 18:57 | 2025 Nov 08 20:07:39 | 74.0543 | 0.00245 | 17.3623 | 47.0354 | 122.2441 | 12.51055 | – |
| 2025 Nov 16 18:58 | 2025 Nov 08 20:07:39 | 74.0543 | 0.00245 | 17.3623 | 47.0354 | 122.2441 | 12.51055 | – |