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 |
| 2025 May 09 17:57 | 2025 May 09 06:50:37 | 74.0559 | 0.00152 | 14.1030 | 49.0940 | 7.7434 | 12.49207 | – |
| 2025 May 08 17:56 | 2025 May 03 14:38:43 | 74.0563 | 0.00151 | 14.6041 | 57.9257 | 7.7434 | 12.49207 | – |
| 2025 May 07 17:56 | 2025 May 03 14:38:43 | 74.0563 | 0.00151 | 14.6041 | 57.9257 | 7.7434 | 12.49207 | – |
| 2025 May 06 17:57 | 2025 May 03 14:38:43 | 74.0563 | 0.00151 | 14.6041 | 57.9257 | 7.7434 | 12.49207 | – |
| 2025 May 05 17:56 | 2025 May 03 14:38:43 | 74.0563 | 0.00151 | 14.6041 | 57.9257 | 7.7434 | 12.49207 | – |
| 2025 May 04 17:57 | 2025 May 03 14:38:43 | 74.0563 | 0.00151 | 14.6041 | 57.9257 | 7.7434 | 12.49207 | – |
| 2025 May 03 17:57 | 2025 May 03 14:38:43 | 74.0563 | 0.00151 | 14.6041 | 57.9257 | 7.7434 | 12.49207 | – |
| 2025 May 01 17:56 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 30 17:56 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 29 17:57 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 27 17:56 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 26 17:57 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 25 17:56 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 24 17:56 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 23 17:57 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 22 17:56 | 2025 Apr 22 11:19:12 | 74.0556 | 0.00151 | 15.5878 | 75.3812 | 7.7434 | 12.49207 | – |
| 2025 Apr 21 17:57 | 2025 Apr 15 20:15:33 | 74.0538 | 0.00152 | 16.1731 | 85.7437 | 7.7434 | 12.49207 | – |
| 2025 Apr 20 17:56 | 2025 Apr 15 20:15:33 | 74.0538 | 0.00152 | 16.1731 | 85.7437 | 7.7434 | 12.49207 | – |
| 2025 Apr 19 17:56 | 2025 Apr 15 20:15:33 | 74.0538 | 0.00152 | 16.1731 | 85.7437 | 7.7434 | 12.49207 | – |
| 2025 Apr 18 17:57 | 2025 Apr 15 20:15:33 | 74.0538 | 0.00152 | 16.1731 | 85.7437 | 7.7434 | 12.49207 | – |
| 2025 Apr 17 17:56 | 2025 Apr 15 20:15:33 | 74.0538 | 0.00152 | 16.1731 | 85.7437 | 7.7434 | 12.49207 | – |
| 2025 Apr 16 17:57 | 2025 Apr 15 20:15:33 | 74.0538 | 0.00152 | 16.1731 | 85.7437 | 7.7434 | 12.49207 | – |
| 2025 Apr 15 17:56 | 2025 Apr 10 20:54:40 | 74.0538 | 0.00151 | 16.6124 | 93.5225 | 7.7434 | 12.49207 | – |
| 2025 Apr 14 17:56 | 2025 Apr 10 20:54:40 | 74.0538 | 0.00151 | 16.6124 | 93.5225 | 7.7434 | 12.49207 | – |