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 |
| 2026 May 30 17:57 | 2026 May 26 07:54:47 | 74.0567 | 0.00248 | 23.7705 | 109.2363 | 63.6706 | 12.51058 | – |
| 2026 May 29 17:57 | 2026 May 26 07:54:47 | 74.0567 | 0.00248 | 23.7705 | 109.2363 | 63.6706 | 12.51058 | – |
| 2026 May 28 17:56 | 2026 May 26 07:54:47 | 74.0567 | 0.00248 | 23.7705 | 109.2363 | 63.6706 | 12.51058 | – |
| 2026 May 27 17:57 | 2026 May 26 07:54:47 | 74.0567 | 0.00248 | 23.7705 | 109.2363 | 63.6706 | 12.51058 | – |
| 2026 May 26 17:57 | 2026 May 26 07:54:47 | 74.0567 | 0.00248 | 23.7705 | 109.2363 | 63.6706 | 12.51058 | – |
| 2026 May 25 17:57 | 2026 May 21 08:56:17 | 74.0572 | 0.00249 | 0.2099 | 116.8772 | 63.6706 | 12.51058 | – |
| 2026 May 24 17:57 | 2026 May 21 08:56:17 | 74.0572 | 0.00249 | 0.2099 | 116.8772 | 63.6706 | 12.51058 | – |
| 2026 May 23 17:58 | 2026 May 21 08:56:17 | 74.0572 | 0.00249 | 0.2099 | 116.8772 | 63.6706 | 12.51058 | – |
| 2026 May 22 17:57 | 2026 May 21 08:56:17 | 74.0572 | 0.00249 | 0.2099 | 116.8772 | 63.6706 | 12.51058 | – |
| 2026 May 21 17:57 | 2026 May 21 08:56:17 | 74.0572 | 0.00249 | 0.2099 | 116.8772 | 63.6706 | 12.51058 | – |
| 2026 May 20 17:57 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 63.6706 | 12.51058 | – |
| 2026 May 19 17:58 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 63.6706 | 12.51058 | – |
| 2026 May 18 17:57 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 63.6706 | 12.51058 | – |
| 2026 May 17 17:57 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 63.6706 | 12.51058 | – |
| 2026 May 16 17:56 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 63.6706 | 12.51058 | – |
| 2026 May 15 17:57 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 63.6706 | 12.51058 | – |
| 2026 May 14 17:58 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 63.6706 | 12.51058 | – |
| 2026 May 13 17:58 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 63.6706 | 12.51058 | – |
| 2026 May 12 17:58 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 63.6706 | 12.51058 | – |
| 2026 May 11 17:56 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 63.6706 | 12.51058 | – |
| 2026 May 10 17:57 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 63.6706 | 12.51058 | – |
| 2026 May 09 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 63.6706 | 12.51058 | – |
| 2026 May 08 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 63.6706 | 12.51058 | – |
| 2026 May 07 17:58 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 63.6706 | 12.51058 | – |
| 2026 May 06 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 63.6706 | 12.51058 | – |
| 2026 May 05 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 63.6706 | 12.51058 | – |
| 2026 May 04 17:57 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 63.6706 | 12.51058 | – |
| 2026 May 03 17:57 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 63.6706 | 12.51058 | – |