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 Sep 15 17:56 | 2025 Sep 15 05:26:41 | 74.0586 | 0.00245 | 22.2031 | 131.5277 | 258.5234 | 12.51053 | – |
| 2025 Sep 12 17:57 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 11 17:57 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 10 17:56 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 08 17:57 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 07 17:56 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 06 20:41 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 03 17:57 | 2025 Sep 03 05:32:42 | 74.0596 | 0.00247 | 23.2660 | 149.8075 | 258.5234 | 12.51053 | – |
| 2025 Sep 02 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 258.5234 | 12.51053 | – |
| 2025 Sep 01 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 258.5234 | 12.51053 | – |
| 2025 Aug 31 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 258.5234 | 12.51053 | – |
| 2025 Aug 30 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 258.5234 | 12.51053 | – |
| 2025 Aug 29 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 258.5234 | 12.51053 | – |
| 2025 Aug 28 17:57 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 258.5234 | 12.51053 | – |
| 2025 Aug 27 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 258.5234 | 12.51053 | – |
| 2025 Aug 26 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 258.5234 | 12.51053 | – |
| 2025 Aug 25 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 258.5234 | 12.51053 | – |
| 2025 Aug 24 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 258.5234 | 12.51053 | – |
| 2025 Aug 23 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 258.5234 | 12.51053 | – |
| 2025 Aug 22 17:56 | 2025 Aug 17 20:55:42 | 74.0579 | 0.00249 | 0.7157 | 174.4559 | 258.5234 | 12.51053 | – |