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 15 17:56 | 2025 Sep 15 04:52:57 | 11.7014 | 0.00021 | 21.8129 | 229.8333 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 14 17:56 | 2025 Sep 14 07:17:02 | 11.7026 | 0.00021 | 21.8133 | 229.5449 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 12 17:57 | 2025 Sep 11 09:56:42 | 11.7066 | 0.00020 | 21.8147 | 229.3693 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 11 17:57 | 2025 Sep 10 08:15:15 | 11.7081 | 0.00020 | 21.8152 | 229.4672 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 10 17:56 | 2025 Sep 09 09:09:51 | 11.7094 | 0.00020 | 21.8157 | 229.3386 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 08 17:57 | 2025 Sep 08 04:51:55 | 11.7110 | 0.00020 | 21.8163 | 229.1688 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 07 17:56 | 2025 Sep 06 10:02:32 | 11.7135 | 0.00020 | 21.8171 | 229.3419 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 06 20:41 | 2025 Sep 05 10:03:42 | 11.7149 | 0.00020 | 21.8176 | 229.0624 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 03 17:57 | 2025 Sep 02 09:44:20 | 11.7191 | 0.00020 | 21.8190 | 227.6120 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 02 17:56 | 2025 Sep 02 05:27:26 | 11.7193 | 0.00020 | 21.8191 | 227.6060 | 75.4678 | 1.00291 | 5.500 |
| 2025 Sep 01 17:56 | 2025 Aug 31 10:09:26 | 11.7218 | 0.00021 | 21.8200 | 226.4539 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 31 17:56 | 2025 Aug 31 04:35:04 | 11.7222 | 0.00021 | 21.8201 | 226.2641 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 30 17:56 | 2025 Aug 29 10:11:37 | 11.7247 | 0.00021 | 21.8209 | 225.1169 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 29 17:56 | 2025 Aug 28 13:01:06 | 11.7259 | 0.00021 | 21.8214 | 224.4118 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 28 17:57 | 2025 Aug 27 10:13:39 | 11.7275 | 0.00021 | 21.8219 | 223.2860 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 27 17:56 | 2025 Aug 25 10:17:38 | 11.7303 | 0.00020 | 21.8228 | 221.3633 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 26 17:56 | 2025 Aug 25 10:17:38 | 11.7303 | 0.00020 | 21.8228 | 221.3633 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 25 17:56 | 2025 Aug 24 10:16:57 | 11.7317 | 0.00020 | 21.8233 | 220.4003 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 24 17:56 | 2025 Aug 23 12:00:24 | 11.7330 | 0.00020 | 21.8238 | 219.7322 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 23 17:56 | 2025 Aug 22 11:53:06 | 11.7344 | 0.00020 | 21.8242 | 218.9583 | 75.4678 | 1.00291 | 5.500 |
| 2025 Aug 22 17:56 | 2025 Aug 20 10:43:38 | 11.7372 | 0.00020 | 21.8252 | 217.5347 | 75.4678 | 1.00291 | 5.500 |