Orbital elements of EXPLORER 31
| Launched | 28 November 1965 |
| Flight ended | – |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 1806 |
| Alternative names |
ISIS-X |
| 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 13 18:56 | 2025 Dec 11 21:36:53 | 79.7760 | 0.14234 | 9.6181 | 141.6371 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 12 18:57 | 2025 Dec 11 21:36:53 | 79.7760 | 0.14234 | 9.6181 | 141.6371 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 11 18:56 | 2025 Dec 06 22:21:29 | 79.7744 | 0.14236 | 9.8912 | 151.3761 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 10 18:56 | 2025 Dec 06 22:21:29 | 79.7744 | 0.14236 | 9.8912 | 151.3761 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 09 18:56 | 2025 Dec 06 22:21:29 | 79.7744 | 0.14236 | 9.8912 | 151.3761 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 08 18:56 | 2025 Dec 06 22:21:29 | 79.7744 | 0.14236 | 9.8912 | 151.3761 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 07 18:56 | 2025 Dec 06 22:21:29 | 79.7744 | 0.14236 | 9.8912 | 151.3761 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 06 18:56 | 2025 Dec 02 11:01:26 | 79.7730 | 0.14238 | 10.1370 | 160.1326 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 05 18:57 | 2025 Dec 02 11:01:26 | 79.7730 | 0.14238 | 10.1370 | 160.1326 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 04 18:57 | 2025 Dec 02 11:01:26 | 79.7730 | 0.14238 | 10.1370 | 160.1326 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 03 18:56 | 2025 Dec 02 11:01:26 | 79.7730 | 0.14238 | 10.1370 | 160.1326 | 229.5150 | 12.08168 | 9.243 |
| 2025 Dec 02 18:56 | 2025 Dec 02 11:01:26 | 79.7730 | 0.14238 | 10.1370 | 160.1326 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 30 18:57 | 2025 Nov 25 12:03:16 | 79.7719 | 0.14239 | 10.5195 | 173.7430 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 29 18:56 | 2025 Nov 25 12:03:16 | 79.7719 | 0.14239 | 10.5195 | 173.7430 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 28 18:57 | 2025 Nov 25 12:03:16 | 79.7719 | 0.14239 | 10.5195 | 173.7430 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 27 18:57 | 2025 Nov 25 12:03:16 | 79.7719 | 0.14239 | 10.5195 | 173.7430 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 26 18:57 | 2025 Nov 25 12:03:16 | 79.7719 | 0.14239 | 10.5195 | 173.7430 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 25 18:57 | 2025 Nov 25 12:03:16 | 79.7719 | 0.14239 | 10.5195 | 173.7430 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 24 18:56 | 2025 Nov 20 00:51:45 | 79.7732 | 0.14239 | 10.8200 | 184.4376 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 23 18:57 | 2025 Nov 20 00:51:45 | 79.7732 | 0.14239 | 10.8200 | 184.4376 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 21 18:57 | 2025 Nov 20 00:51:45 | 79.7732 | 0.14239 | 10.8200 | 184.4376 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 20 18:56 | 2025 Nov 20 00:51:45 | 79.7732 | 0.14239 | 10.8200 | 184.4376 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 18 18:57 | 2025 Nov 08 14:33:12 | 79.7795 | 0.14237 | 11.4483 | 206.8230 | 229.5150 | 12.08168 | 9.243 |
| 2025 Nov 16 18:58 | 2025 Nov 08 14:33:12 | 79.7795 | 0.14237 | 11.4483 | 206.8230 | 229.5150 | 12.08168 | 9.243 |