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 Sep 06 20:41 | 2025 Sep 05 10:03:42 | 11.7149 | 0.00020 | 21.8176 | 229.0624 | 143.6419 | 1.00286 | 5.500 |
| 2025 Sep 03 17:57 | 2025 Sep 02 09:44:20 | 11.7191 | 0.00020 | 21.8190 | 227.6120 | 143.6419 | 1.00286 | 5.500 |
| 2025 Sep 02 17:56 | 2025 Sep 02 05:27:26 | 11.7193 | 0.00020 | 21.8191 | 227.6060 | 143.6419 | 1.00286 | 5.500 |
| 2025 Sep 01 17:56 | 2025 Aug 31 10:09:26 | 11.7218 | 0.00021 | 21.8200 | 226.4539 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 31 17:56 | 2025 Aug 31 04:35:04 | 11.7222 | 0.00021 | 21.8201 | 226.2641 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 30 17:56 | 2025 Aug 29 10:11:37 | 11.7247 | 0.00021 | 21.8209 | 225.1169 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 29 17:56 | 2025 Aug 28 13:01:06 | 11.7259 | 0.00021 | 21.8214 | 224.4118 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 28 17:57 | 2025 Aug 27 10:13:39 | 11.7275 | 0.00021 | 21.8219 | 223.2860 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 27 17:56 | 2025 Aug 25 10:17:38 | 11.7303 | 0.00020 | 21.8228 | 221.3633 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 26 17:56 | 2025 Aug 25 10:17:38 | 11.7303 | 0.00020 | 21.8228 | 221.3633 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 25 17:56 | 2025 Aug 24 10:16:57 | 11.7317 | 0.00020 | 21.8233 | 220.4003 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 24 17:56 | 2025 Aug 23 12:00:24 | 11.7330 | 0.00020 | 21.8238 | 219.7322 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 23 17:56 | 2025 Aug 22 11:53:06 | 11.7344 | 0.00020 | 21.8242 | 218.9583 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 22 17:56 | 2025 Aug 20 10:43:38 | 11.7372 | 0.00020 | 21.8252 | 217.5347 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 20 17:56 | 2025 Aug 19 10:22:19 | 11.7386 | 0.00020 | 21.8258 | 217.0060 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 19 17:56 | 2025 Aug 18 10:23:20 | 11.7399 | 0.00019 | 21.8263 | 216.5649 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 18 17:56 | 2025 Aug 18 10:23:20 | 11.7399 | 0.00019 | 21.8263 | 216.5649 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 16 17:56 | 2025 Aug 15 11:19:33 | 11.7440 | 0.00019 | 21.8277 | 215.9458 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 15 17:57 | 2025 Aug 14 11:34:43 | 11.7454 | 0.00019 | 21.8282 | 215.6977 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 14 17:56 | 2025 Aug 13 10:00:25 | 11.7469 | 0.00019 | 21.8288 | 215.7969 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 13 17:58 | 2025 Aug 12 10:21:21 | 11.7483 | 0.00018 | 21.8292 | 215.9095 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 12 17:56 | 2025 Aug 11 11:38:23 | 11.7496 | 0.00018 | 21.8297 | 215.9534 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 11 17:56 | 2025 Aug 10 10:54:38 | 11.7510 | 0.00018 | 21.8302 | 215.9971 | 143.6419 | 1.00286 | 5.500 |
| 2025 Aug 10 17:57 | 2025 Aug 10 10:54:38 | 11.7510 | 0.00018 | 21.8302 | 215.9971 | 143.6419 | 1.00286 | 5.500 |