Orbital elements of RADUGA 21
| Launched | 9 December 1987 |
| Flight ended | – |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 18631 |
| 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 08 17:56 | 2025 May 07 17:02:25 | 11.8868 | 0.00012 | 21.8766 | 189.2488 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 07 17:56 | 2025 May 06 17:03:10 | 11.8883 | 0.00012 | 21.8771 | 188.5710 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 06 17:57 | 2025 May 06 05:31:38 | 11.8890 | 0.00012 | 21.8773 | 188.2676 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 05 17:56 | 2025 May 04 05:07:38 | 11.8919 | 0.00011 | 21.8783 | 187.1422 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 04 17:57 | 2025 May 04 05:07:38 | 11.8919 | 0.00011 | 21.8783 | 187.1422 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 03 17:57 | 2025 May 02 17:05:41 | 11.8940 | 0.00011 | 21.8790 | 186.5140 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 02 17:57 | 2025 May 01 17:06:17 | 11.8954 | 0.00011 | 21.8795 | 186.3603 | 173.9829 | 1.00232 | 5.500 |
| 2025 May 01 17:56 | 2025 Apr 28 17:08:15 | 11.8997 | 0.00010 | 21.8810 | 187.2379 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 30 17:56 | 2025 Apr 28 17:08:15 | 11.8997 | 0.00010 | 21.8810 | 187.2379 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 29 17:57 | 2025 Apr 28 17:08:15 | 11.8997 | 0.00010 | 21.8810 | 187.2379 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 27 17:56 | 2025 Apr 26 11:34:09 | 11.9029 | 0.00010 | 21.8821 | 189.2694 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 26 17:57 | 2025 Apr 26 11:34:09 | 11.9029 | 0.00010 | 21.8821 | 189.2694 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 25 17:56 | 2025 Apr 24 17:10:47 | 11.9054 | 0.00010 | 21.8829 | 190.4167 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 24 17:56 | 2025 Apr 22 17:12:10 | 11.9082 | 0.00010 | 21.8839 | 192.3508 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 23 17:57 | 2025 Apr 22 17:12:10 | 11.9082 | 0.00010 | 21.8839 | 192.3508 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 22 17:56 | 2025 Apr 21 17:12:49 | 11.9096 | 0.00010 | 21.8843 | 193.1998 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 21 17:57 | 2025 Apr 20 17:43:38 | 11.9110 | 0.00010 | 21.8848 | 194.0257 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 20 17:56 | 2025 Apr 19 11:00:02 | 11.9128 | 0.00010 | 21.8854 | 195.1232 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 19 17:56 | 2025 Apr 19 05:30:15 | 11.9131 | 0.00010 | 21.8855 | 195.3761 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 18 17:57 | 2025 Apr 17 07:32:58 | 11.9159 | 0.00010 | 21.8864 | 195.8043 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 17 17:56 | 2025 Apr 16 17:16:00 | 11.9168 | 0.00010 | 21.8867 | 195.4895 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 16 17:57 | 2025 Apr 16 06:58:57 | 11.9174 | 0.00010 | 21.8869 | 195.8607 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 15 17:56 | 2025 Apr 14 17:16:59 | 11.9197 | 0.00010 | 21.8876 | 195.2441 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 14 17:56 | 2025 Apr 14 04:52:45 | 11.9205 | 0.00010 | 21.8879 | 195.4373 | 173.9829 | 1.00232 | 5.500 |
| 2025 Apr 11 17:57 | 2025 Apr 10 11:08:34 | 11.9259 | 0.00010 | 21.8896 | 193.5954 | 173.9829 | 1.00232 | 5.500 |