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 Oct 31 18:57 | 2025 Oct 29 12:05:49 | 74.0573 | 0.00151 | 22.8042 | 152.7506 | 315.0208 | 12.49210 | – |
| 2025 Oct 30 18:57 | 2025 Oct 29 12:05:49 | 74.0573 | 0.00151 | 22.8042 | 152.7506 | 315.0208 | 12.49210 | – |
| 2025 Oct 29 18:57 | 2025 Oct 29 12:05:49 | 74.0573 | 0.00151 | 22.8042 | 152.7506 | 315.0208 | 12.49210 | – |
| 2025 Oct 28 18:57 | 2025 Oct 23 21:34:59 | 74.0584 | 0.00152 | 23.2992 | 161.2231 | 315.0208 | 12.49210 | – |
| 2025 Oct 27 18:57 | 2025 Oct 23 21:34:59 | 74.0584 | 0.00152 | 23.2992 | 161.2231 | 315.0208 | 12.49210 | – |
| 2025 Oct 26 18:57 | 2025 Oct 23 21:34:59 | 74.0584 | 0.00152 | 23.2992 | 161.2231 | 315.0208 | 12.49210 | – |
| 2025 Oct 25 17:57 | 2025 Oct 23 21:34:59 | 74.0584 | 0.00152 | 23.2992 | 161.2231 | 315.0208 | 12.49210 | – |
| 2025 Oct 24 17:57 | 2025 Oct 23 21:34:59 | 74.0584 | 0.00152 | 23.2992 | 161.2231 | 315.0208 | 12.49210 | – |
| 2025 Oct 22 17:56 | 2025 Oct 18 06:49:03 | 74.0592 | 0.00153 | 23.7951 | 169.6897 | 315.0208 | 12.49210 | – |
| 2025 Oct 21 17:56 | 2025 Oct 18 06:49:03 | 74.0592 | 0.00153 | 23.7951 | 169.6897 | 315.0208 | 12.49210 | – |
| 2025 Oct 20 17:56 | 2025 Oct 18 06:49:03 | 74.0592 | 0.00153 | 23.7951 | 169.6897 | 315.0208 | 12.49210 | – |
| 2025 Oct 19 17:56 | 2025 Oct 18 06:49:03 | 74.0592 | 0.00153 | 23.7951 | 169.6897 | 315.0208 | 12.49210 | – |
| 2025 Oct 18 17:56 | 2025 Oct 18 06:49:03 | 74.0592 | 0.00153 | 23.7951 | 169.6897 | 315.0208 | 12.49210 | – |
| 2025 Oct 17 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 16 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 15 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 14 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 12 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 11 17:57 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 09 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 08 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 07 17:56 | 2025 Oct 07 12:59:59 | 74.0597 | 0.00155 | 0.7438 | 185.6258 | 315.0208 | 12.49210 | – |
| 2025 Oct 05 17:56 | 2025 Sep 25 17:07:02 | 74.0588 | 0.00157 | 1.7883 | 203.0631 | 315.0208 | 12.49210 | – |
| 2025 Oct 04 17:57 | 2025 Sep 25 17:07:02 | 74.0588 | 0.00157 | 1.7883 | 203.0631 | 315.0208 | 12.49210 | – |