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 Dec 20 18:57 | 2025 Dec 20 11:27:12 | 74.0562 | 0.00148 | 18.2134 | 71.2511 | 49.9832 | 12.49211 | – |
| 2025 Dec 19 18:57 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 18 18:57 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 17 18:58 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 16 18:57 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 15 18:58 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 14 18:56 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 13 18:56 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 12 18:57 | 2025 Dec 12 07:23:20 | 74.0562 | 0.00147 | 18.9349 | 84.1074 | 49.9832 | 12.49211 | – |
| 2025 Dec 11 18:56 | 2025 Dec 07 06:04:04 | 74.0558 | 0.00147 | 19.3814 | 92.1134 | 49.9832 | 12.49211 | – |
| 2025 Dec 10 18:56 | 2025 Dec 07 06:04:04 | 74.0558 | 0.00147 | 19.3814 | 92.1134 | 49.9832 | 12.49211 | – |
| 2025 Dec 09 18:56 | 2025 Dec 07 06:04:04 | 74.0558 | 0.00147 | 19.3814 | 92.1134 | 49.9832 | 12.49211 | – |
| 2025 Dec 08 18:56 | 2025 Dec 07 06:04:04 | 74.0558 | 0.00147 | 19.3814 | 92.1134 | 49.9832 | 12.49211 | – |
| 2025 Dec 07 18:56 | 2025 Dec 07 06:04:04 | 74.0558 | 0.00147 | 19.3814 | 92.1134 | 49.9832 | 12.49211 | – |
| 2025 Dec 06 18:56 | 2025 Dec 02 09:05:24 | 74.0555 | 0.00147 | 19.8119 | 99.8006 | 49.9832 | 12.49211 | – |
| 2025 Dec 05 18:57 | 2025 Dec 02 09:05:24 | 74.0555 | 0.00147 | 19.8119 | 99.8006 | 49.9832 | 12.49211 | – |
| 2025 Dec 04 18:57 | 2025 Dec 02 09:05:24 | 74.0555 | 0.00147 | 19.8119 | 99.8006 | 49.9832 | 12.49211 | – |
| 2025 Dec 03 18:56 | 2025 Dec 02 09:05:24 | 74.0555 | 0.00147 | 19.8119 | 99.8006 | 49.9832 | 12.49211 | – |
| 2025 Dec 02 18:56 | 2025 Dec 02 09:05:24 | 74.0555 | 0.00147 | 19.8119 | 99.8006 | 49.9832 | 12.49211 | – |
| 2025 Nov 30 18:57 | 2025 Nov 25 09:54:13 | 74.0552 | 0.00147 | 20.4273 | 110.7579 | 49.9832 | 12.49211 | – |
| 2025 Nov 29 18:56 | 2025 Nov 25 09:54:13 | 74.0552 | 0.00147 | 20.4273 | 110.7579 | 49.9832 | 12.49211 | – |
| 2025 Nov 28 18:57 | 2025 Nov 25 09:54:13 | 74.0552 | 0.00147 | 20.4273 | 110.7579 | 49.9832 | 12.49211 | – |
| 2025 Nov 27 18:57 | 2025 Nov 25 09:54:13 | 74.0552 | 0.00147 | 20.4273 | 110.7579 | 49.9832 | 12.49211 | – |
| 2025 Nov 26 18:57 | 2025 Nov 25 09:54:13 | 74.0552 | 0.00147 | 20.4273 | 110.7579 | 49.9832 | 12.49211 | – |
| 2025 Nov 25 18:57 | 2025 Nov 25 09:54:13 | 74.0552 | 0.00147 | 20.4273 | 110.7579 | 49.9832 | 12.49211 | – |
| 2025 Nov 24 18:56 | 2025 Nov 20 06:19:53 | 74.0550 | 0.00147 | 20.8821 | 118.9505 | 49.9832 | 12.49211 | – |
| 2025 Nov 23 18:57 | 2025 Nov 20 06:19:53 | 74.0550 | 0.00147 | 20.8821 | 118.9505 | 49.9832 | 12.49211 | – |