Orbital elements of COSMOS 1638
| Launched | 20 March 1985 |
| Flight ended | – |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 15620 |
| 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 Feb 26 20:45 | 2026 Feb 26 12:47:49 | 74.0563 | 0.00159 | 12.2026 | 327.5305 | 110.3177 | 12.49213 | – |
| 2026 Feb 05 18:58 | 2026 Feb 02 11:58:59 | 74.0525 | 0.00155 | 14.3252 | 3.5916 | 110.3177 | 12.49213 | – |
| 2026 Feb 04 18:57 | 2026 Feb 02 11:58:59 | 74.0525 | 0.00155 | 14.3252 | 3.5916 | 110.3177 | 12.49213 | – |
| 2026 Feb 03 18:56 | 2026 Feb 02 11:58:59 | 74.0525 | 0.00155 | 14.3252 | 3.5916 | 110.3177 | 12.49213 | – |
| 2026 Feb 02 18:56 | 2026 Feb 02 11:58:59 | 74.0525 | 0.00155 | 14.3252 | 3.5916 | 110.3177 | 12.49213 | – |
| 2026 Feb 01 18:56 | 2026 Jan 27 06:50:40 | 74.0521 | 0.00154 | 14.8741 | 12.9882 | 110.3177 | 12.49213 | – |
| 2026 Jan 31 18:56 | 2026 Jan 27 06:50:40 | 74.0521 | 0.00154 | 14.8741 | 12.9882 | 110.3177 | 12.49213 | – |
| 2026 Jan 30 18:57 | 2026 Jan 27 06:50:40 | 74.0521 | 0.00154 | 14.8741 | 12.9882 | 110.3177 | 12.49213 | – |