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 May 16 17:56 | 2026 May 16 14:10:06 | 74.0556 | 0.00160 | 5.2201 | 212.1166 | 320.1932 | 12.49214 | – |
| 2026 May 15 17:57 | 2026 May 10 07:57:51 | 74.0545 | 0.00161 | 5.7728 | 221.3766 | 320.1932 | 12.49214 | – |
| 2026 May 14 17:58 | 2026 May 10 07:57:51 | 74.0545 | 0.00161 | 5.7728 | 221.3766 | 320.1932 | 12.49214 | – |
| 2026 May 13 17:58 | 2026 May 10 07:57:51 | 74.0545 | 0.00161 | 5.7728 | 221.3766 | 320.1932 | 12.49214 | – |
| 2026 May 12 17:58 | 2026 May 10 07:57:51 | 74.0545 | 0.00161 | 5.7728 | 221.3766 | 320.1932 | 12.49214 | – |
| 2026 May 11 17:56 | 2026 May 10 07:57:51 | 74.0545 | 0.00161 | 5.7728 | 221.3766 | 320.1932 | 12.49214 | – |
| 2026 May 10 17:57 | 2026 May 10 07:57:51 | 74.0545 | 0.00161 | 5.7728 | 221.3766 | 320.1932 | 12.49214 | – |
| 2026 May 09 17:57 | 2026 May 05 09:00:57 | 74.0537 | 0.00162 | 6.2106 | 228.6696 | 320.1932 | 12.49214 | – |
| 2026 May 08 17:57 | 2026 May 05 09:00:57 | 74.0537 | 0.00162 | 6.2106 | 228.6696 | 320.1932 | 12.49214 | – |
| 2026 May 07 17:58 | 2026 May 05 09:00:57 | 74.0537 | 0.00162 | 6.2106 | 228.6696 | 320.1932 | 12.49214 | – |
| 2026 May 06 17:57 | 2026 May 05 09:00:57 | 74.0537 | 0.00162 | 6.2106 | 228.6696 | 320.1932 | 12.49214 | – |
| 2026 May 05 17:57 | 2026 May 05 09:00:57 | 74.0537 | 0.00162 | 6.2106 | 228.6696 | 320.1932 | 12.49214 | – |
| 2026 May 04 17:57 | 2026 Apr 30 09:40:05 | 74.0529 | 0.00163 | 6.6498 | 235.9633 | 320.1932 | 12.49214 | – |
| 2026 May 03 17:57 | 2026 Apr 30 09:40:05 | 74.0529 | 0.00163 | 6.6498 | 235.9633 | 320.1932 | 12.49214 | – |
| 2026 May 02 17:57 | 2026 Apr 30 09:40:05 | 74.0529 | 0.00163 | 6.6498 | 235.9633 | 320.1932 | 12.49214 | – |
| 2026 May 01 17:56 | 2026 Apr 30 09:40:05 | 74.0529 | 0.00163 | 6.6498 | 235.9633 | 320.1932 | 12.49214 | – |
| 2026 Apr 30 17:56 | 2026 Apr 30 09:40:05 | 74.0529 | 0.00163 | 6.6498 | 235.9633 | 320.1932 | 12.49214 | – |
| 2026 Apr 29 17:57 | 2026 Apr 24 11:26:54 | 74.0521 | 0.00163 | 7.1733 | 244.6210 | 320.1932 | 12.49214 | – |
| 2026 Apr 28 17:56 | 2026 Apr 24 11:26:54 | 74.0521 | 0.00163 | 7.1733 | 244.6210 | 320.1932 | 12.49214 | – |
| 2026 Apr 27 17:58 | 2026 Apr 24 11:26:54 | 74.0521 | 0.00163 | 7.1733 | 244.6210 | 320.1932 | 12.49214 | – |
| 2026 Apr 26 17:58 | 2026 Apr 24 11:26:54 | 74.0521 | 0.00163 | 7.1733 | 244.6210 | 320.1932 | 12.49214 | – |
| 2026 Apr 25 17:58 | 2026 Apr 24 11:26:54 | 74.0521 | 0.00163 | 7.1733 | 244.6210 | 320.1932 | 12.49214 | – |
| 2026 Apr 24 17:59 | 2026 Apr 24 11:26:54 | 74.0521 | 0.00163 | 7.1733 | 244.6210 | 320.1932 | 12.49214 | – |
| 2026 Apr 23 17:57 | 2026 Apr 19 12:18:13 | 74.0520 | 0.00164 | 7.6118 | 251.8225 | 320.1932 | 12.49214 | – |
| 2026 Apr 22 17:57 | 2026 Apr 19 12:18:13 | 74.0520 | 0.00164 | 7.6118 | 251.8225 | 320.1932 | 12.49214 | – |
| 2026 Apr 21 17:57 | 2026 Apr 19 12:18:13 | 74.0520 | 0.00164 | 7.6118 | 251.8225 | 320.1932 | 12.49214 | – |
| 2026 Apr 20 17:57 | 2026 Apr 19 12:18:13 | 74.0520 | 0.00164 | 7.6118 | 251.8225 | 320.1932 | 12.49214 | – |
| 2026 Apr 19 17:58 | 2026 Apr 19 12:18:13 | 74.0520 | 0.00164 | 7.6118 | 251.8225 | 320.1932 | 12.49214 | – |