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 Aug 31 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 274.1202 | 12.51052 | – |
| 2025 Aug 30 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 274.1202 | 12.51052 | – |
| 2025 Aug 29 17:56 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 274.1202 | 12.51052 | – |
| 2025 Aug 28 17:57 | 2025 Aug 27 18:22:55 | 74.0593 | 0.00248 | 23.8389 | 159.5837 | 274.1202 | 12.51052 | – |
| 2025 Aug 27 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 274.1202 | 12.51052 | – |
| 2025 Aug 26 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 274.1202 | 12.51052 | – |
| 2025 Aug 25 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 274.1202 | 12.51052 | – |
| 2025 Aug 24 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 274.1202 | 12.51052 | – |
| 2025 Aug 23 17:56 | 2025 Aug 20 19:50:59 | 74.0584 | 0.00249 | 0.4538 | 170.0351 | 274.1202 | 12.51052 | – |
| 2025 Aug 22 17:56 | 2025 Aug 17 20:55:42 | 74.0579 | 0.00249 | 0.7157 | 174.4559 | 274.1202 | 12.51052 | – |
| 2025 Aug 20 17:56 | 2025 Aug 17 20:55:42 | 74.0579 | 0.00249 | 0.7157 | 174.4559 | 274.1202 | 12.51052 | – |
| 2025 Aug 19 17:56 | 2025 Aug 17 20:55:42 | 74.0579 | 0.00249 | 0.7157 | 174.4559 | 274.1202 | 12.51052 | – |
| 2025 Aug 18 17:56 | 2025 Aug 17 20:55:42 | 74.0579 | 0.00249 | 0.7157 | 174.4559 | 274.1202 | 12.51052 | – |
| 2025 Aug 16 17:56 | 2025 Aug 12 09:40:51 | 74.0568 | 0.00250 | 1.2004 | 182.6657 | 274.1202 | 12.51052 | – |
| 2025 Aug 15 17:57 | 2025 Aug 12 09:40:51 | 74.0568 | 0.00250 | 1.2004 | 182.6657 | 274.1202 | 12.51052 | – |
| 2025 Aug 14 17:56 | 2025 Aug 12 09:40:51 | 74.0568 | 0.00250 | 1.2004 | 182.6657 | 274.1202 | 12.51052 | – |
| 2025 Aug 13 17:58 | 2025 Aug 12 09:40:51 | 74.0568 | 0.00250 | 1.2004 | 182.6657 | 274.1202 | 12.51052 | – |
| 2025 Aug 12 17:56 | 2025 Aug 12 09:40:51 | 74.0568 | 0.00250 | 1.2004 | 182.6657 | 274.1202 | 12.51052 | – |
| 2025 Aug 11 17:56 | 2025 Aug 06 21:56:15 | 74.0560 | 0.00251 | 1.6869 | 190.8875 | 274.1202 | 12.51052 | – |
| 2025 Aug 10 17:57 | 2025 Aug 06 21:56:15 | 74.0560 | 0.00251 | 1.6869 | 190.8875 | 274.1202 | 12.51052 | – |
| 2025 Aug 09 17:56 | 2025 Aug 06 21:56:15 | 74.0560 | 0.00251 | 1.6869 | 190.8875 | 274.1202 | 12.51052 | – |
| 2025 Aug 08 17:56 | 2025 Aug 06 21:56:15 | 74.0560 | 0.00251 | 1.6869 | 190.8875 | 274.1202 | 12.51052 | – |
| 2025 Aug 07 17:56 | 2025 Aug 06 21:56:15 | 74.0560 | 0.00251 | 1.6869 | 190.8875 | 274.1202 | 12.51052 | – |
| 2025 Aug 05 17:56 | 2025 Jul 31 22:07:57 | 74.0554 | 0.00252 | 2.2180 | 199.8904 | 274.1202 | 12.51052 | – |
| 2025 Aug 04 17:56 | 2025 Jul 31 22:07:57 | 74.0554 | 0.00252 | 2.2180 | 199.8904 | 274.1202 | 12.51052 | – |