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 19 17:58 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 264.0908 | 12.51058 | – |
| 2026 May 18 17:57 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 264.0908 | 12.51058 | – |
| 2026 May 17 17:57 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 264.0908 | 12.51058 | – |
| 2026 May 16 17:56 | 2026 May 16 14:56:27 | 74.0576 | 0.00249 | 0.6309 | 124.2003 | 264.0908 | 12.51058 | – |
| 2026 May 15 17:57 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 264.0908 | 12.51058 | – |
| 2026 May 14 17:58 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 264.0908 | 12.51058 | – |
| 2026 May 13 17:58 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 264.0908 | 12.51058 | – |
| 2026 May 12 17:58 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 264.0908 | 12.51058 | – |
| 2026 May 11 17:56 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 264.0908 | 12.51058 | – |
| 2026 May 10 17:57 | 2026 May 10 03:58:19 | 74.0583 | 0.00249 | 1.2031 | 134.1569 | 264.0908 | 12.51058 | – |
| 2026 May 09 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 264.0908 | 12.51058 | – |
| 2026 May 08 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 264.0908 | 12.51058 | – |
| 2026 May 07 17:58 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 264.0908 | 12.51058 | – |
| 2026 May 06 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 264.0908 | 12.51058 | – |
| 2026 May 05 17:57 | 2026 May 05 11:02:57 | 74.0585 | 0.00250 | 1.6201 | 141.4077 | 264.0908 | 12.51058 | – |
| 2026 May 04 17:57 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 264.0908 | 12.51058 | – |
| 2026 May 03 17:57 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 264.0908 | 12.51058 | – |
| 2026 May 02 17:57 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 264.0908 | 12.51058 | – |
| 2026 May 01 17:56 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 264.0908 | 12.51058 | – |
| 2026 Apr 30 17:56 | 2026 Apr 30 12:04:09 | 74.0586 | 0.00250 | 2.0594 | 149.0438 | 264.0908 | 12.51058 | – |
| 2026 Apr 29 17:57 | 2026 Apr 24 06:21:38 | 74.0581 | 0.00251 | 2.6122 | 158.6191 | 264.0908 | 12.51058 | – |
| 2026 Apr 28 17:56 | 2026 Apr 24 06:21:38 | 74.0581 | 0.00251 | 2.6122 | 158.6191 | 264.0908 | 12.51058 | – |
| 2026 Apr 27 17:58 | 2026 Apr 24 06:21:38 | 74.0581 | 0.00251 | 2.6122 | 158.6191 | 264.0908 | 12.51058 | – |
| 2026 Apr 26 17:58 | 2026 Apr 24 06:21:38 | 74.0581 | 0.00251 | 2.6122 | 158.6191 | 264.0908 | 12.51058 | – |
| 2026 Apr 25 17:58 | 2026 Apr 24 06:21:38 | 74.0581 | 0.00251 | 2.6122 | 158.6191 | 264.0908 | 12.51058 | – |
| 2026 Apr 24 17:59 | 2026 Apr 24 06:21:38 | 74.0581 | 0.00251 | 2.6122 | 158.6191 | 264.0908 | 12.51058 | – |
| 2026 Apr 23 17:57 | 2026 Apr 19 13:10:06 | 74.0573 | 0.00252 | 3.0301 | 165.8310 | 264.0908 | 12.51058 | – |
| 2026 Apr 22 17:57 | 2026 Apr 19 13:10:06 | 74.0573 | 0.00252 | 3.0301 | 165.8310 | 264.0908 | 12.51058 | – |