Orbital elements of H-1 R/B
| Launched | 6 February 1990 |
| Flight ended | – |
| Launch site | Tanegashima Space Center, Japan |
| Owner | Japan |
| NORAD ID | 20491 |
| 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 14 23:19:26 | 99.0238 | 0.04687 | 15.8013 | 83.3614 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 12 17:57 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 11 17:57 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 10 17:56 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 08 17:57 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 07 17:56 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 06 20:41 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 03 17:57 | 2025 Sep 03 05:31:43 | 99.0234 | 0.04687 | 15.1444 | 110.8799 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 02 17:56 | 2025 Aug 27 20:39:25 | 99.0217 | 0.04686 | 14.7881 | 125.8121 | 282.0597 | 13.03726 | 4.743 |
| 2025 Sep 01 17:56 | 2025 Aug 27 20:39:25 | 99.0217 | 0.04686 | 14.7881 | 125.8121 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 31 17:56 | 2025 Aug 27 20:39:25 | 99.0217 | 0.04686 | 14.7881 | 125.8121 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 30 17:56 | 2025 Aug 27 20:39:25 | 99.0217 | 0.04686 | 14.7881 | 125.8121 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 29 17:56 | 2025 Aug 27 20:39:25 | 99.0217 | 0.04686 | 14.7881 | 125.8121 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 28 17:57 | 2025 Aug 27 20:39:25 | 99.0217 | 0.04686 | 14.7881 | 125.8121 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 27 17:56 | 2025 Aug 22 17:15:09 | 99.0200 | 0.04685 | 14.5006 | 137.8752 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 26 17:56 | 2025 Aug 22 17:15:09 | 99.0200 | 0.04685 | 14.5006 | 137.8752 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 25 17:56 | 2025 Aug 22 17:15:09 | 99.0200 | 0.04685 | 14.5006 | 137.8752 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 24 17:56 | 2025 Aug 22 17:15:09 | 99.0200 | 0.04685 | 14.5006 | 137.8752 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 23 17:56 | 2025 Aug 22 17:15:09 | 99.0200 | 0.04685 | 14.5006 | 137.8752 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 22 17:56 | 2025 Aug 17 23:03:23 | 99.0185 | 0.04683 | 14.2345 | 149.0406 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 20 17:56 | 2025 Aug 17 23:03:23 | 99.0185 | 0.04683 | 14.2345 | 149.0406 | 282.0597 | 13.03726 | 4.743 |
| 2025 Aug 19 17:56 | 2025 Aug 17 23:03:23 | 99.0185 | 0.04683 | 14.2345 | 149.0406 | 282.0597 | 13.03726 | 4.743 |