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 Sep 02 17:56 | 2025 Aug 27 20:58:31 | 74.0535 | 0.00159 | 4.3356 | 245.0761 | 179.8032 | 12.49209 | – |
| 2025 Sep 01 17:56 | 2025 Aug 27 20:58:31 | 74.0535 | 0.00159 | 4.3356 | 245.0761 | 179.8032 | 12.49209 | – |
| 2025 Aug 31 17:56 | 2025 Aug 27 20:58:31 | 74.0535 | 0.00159 | 4.3356 | 245.0761 | 179.8032 | 12.49209 | – |
| 2025 Aug 30 17:56 | 2025 Aug 27 20:58:31 | 74.0535 | 0.00159 | 4.3356 | 245.0761 | 179.8032 | 12.49209 | – |
| 2025 Aug 29 17:56 | 2025 Aug 27 20:58:31 | 74.0535 | 0.00159 | 4.3356 | 245.0761 | 179.8032 | 12.49209 | – |
| 2025 Aug 28 17:57 | 2025 Aug 27 20:58:31 | 74.0535 | 0.00159 | 4.3356 | 245.0761 | 179.8032 | 12.49209 | – |
| 2025 Aug 27 17:56 | 2025 Aug 22 23:47:19 | 74.0533 | 0.00159 | 4.7670 | 252.1515 | 179.8032 | 12.49209 | – |
| 2025 Aug 26 17:56 | 2025 Aug 22 23:47:19 | 74.0533 | 0.00159 | 4.7670 | 252.1515 | 179.8032 | 12.49209 | – |
| 2025 Aug 25 17:56 | 2025 Aug 22 23:47:19 | 74.0533 | 0.00159 | 4.7670 | 252.1515 | 179.8032 | 12.49209 | – |
| 2025 Aug 24 17:56 | 2025 Aug 22 23:47:19 | 74.0533 | 0.00159 | 4.7670 | 252.1515 | 179.8032 | 12.49209 | – |
| 2025 Aug 23 17:56 | 2025 Aug 22 23:47:19 | 74.0533 | 0.00159 | 4.7670 | 252.1515 | 179.8032 | 12.49209 | – |
| 2025 Aug 22 17:56 | 2025 Aug 17 22:54:56 | 74.0533 | 0.00160 | 5.2119 | 259.5632 | 179.8032 | 12.49209 | – |
| 2025 Aug 20 17:56 | 2025 Aug 17 22:54:56 | 74.0533 | 0.00160 | 5.2119 | 259.5632 | 179.8032 | 12.49209 | – |
| 2025 Aug 19 17:56 | 2025 Aug 17 22:54:56 | 74.0533 | 0.00160 | 5.2119 | 259.5632 | 179.8032 | 12.49209 | – |
| 2025 Aug 18 17:56 | 2025 Aug 17 22:54:56 | 74.0533 | 0.00160 | 5.2119 | 259.5632 | 179.8032 | 12.49209 | – |
| 2025 Aug 16 17:56 | 2025 Aug 12 08:42:52 | 74.0538 | 0.00160 | 5.7059 | 267.6581 | 179.8032 | 12.49209 | – |
| 2025 Aug 15 17:57 | 2025 Aug 12 08:42:52 | 74.0538 | 0.00160 | 5.7059 | 267.6581 | 179.8032 | 12.49209 | – |
| 2025 Aug 14 17:56 | 2025 Aug 12 08:42:52 | 74.0538 | 0.00160 | 5.7059 | 267.6581 | 179.8032 | 12.49209 | – |
| 2025 Aug 13 17:58 | 2025 Aug 12 08:42:52 | 74.0538 | 0.00160 | 5.7059 | 267.6581 | 179.8032 | 12.49209 | – |
| 2025 Aug 12 17:56 | 2025 Aug 12 08:42:52 | 74.0538 | 0.00160 | 5.7059 | 267.6581 | 179.8032 | 12.49209 | – |
| 2025 Aug 11 17:56 | 2025 Aug 06 23:05:07 | 74.0543 | 0.00160 | 6.1830 | 275.4944 | 179.8032 | 12.49209 | – |
| 2025 Aug 10 17:57 | 2025 Aug 06 23:05:07 | 74.0543 | 0.00160 | 6.1830 | 275.4944 | 179.8032 | 12.49209 | – |
| 2025 Aug 09 17:56 | 2025 Aug 06 23:05:07 | 74.0543 | 0.00160 | 6.1830 | 275.4944 | 179.8032 | 12.49209 | – |
| 2025 Aug 08 17:56 | 2025 Aug 06 23:05:07 | 74.0543 | 0.00160 | 6.1830 | 275.4944 | 179.8032 | 12.49209 | – |
| 2025 Aug 07 17:56 | 2025 Aug 06 23:05:07 | 74.0543 | 0.00160 | 6.1830 | 275.4944 | 179.8032 | 12.49209 | – |