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 |
| 2026 Mar 03 18:56 | 2026 Feb 26 12:07:03 | 99.0508 | 0.04685 | 1.0192 | 57.2352 | 307.3012 | 13.03726 | 4.743 |
| 2026 Mar 02 18:57 | 2026 Feb 26 12:07:03 | 99.0508 | 0.04685 | 1.0192 | 57.2352 | 307.3012 | 13.03726 | 4.743 |
| 2026 Mar 01 18:57 | 2026 Feb 26 12:07:03 | 99.0508 | 0.04685 | 1.0192 | 57.2352 | 307.3012 | 13.03726 | 4.743 |
| 2026 Feb 28 18:56 | 2026 Feb 26 12:07:03 | 99.0508 | 0.04685 | 1.0192 | 57.2352 | 307.3012 | 13.03726 | 4.743 |
| 2026 Feb 27 19:05 | 2026 Feb 26 12:07:03 | 99.0508 | 0.04685 | 1.0192 | 57.2352 | 307.3012 | 13.03726 | 4.743 |
| 2026 Feb 26 20:45 | 2026 Feb 26 12:07:03 | 99.0508 | 0.04685 | 1.0192 | 57.2352 | 307.3012 | 13.03726 | 4.743 |
| 2026 Feb 05 18:58 | 2026 Feb 02 11:38:28 | 99.0491 | 0.04685 | 23.6721 | 113.4953 | 307.3012 | 13.03726 | 4.743 |
| 2026 Feb 04 18:57 | 2026 Feb 02 11:38:28 | 99.0491 | 0.04685 | 23.6721 | 113.4953 | 307.3012 | 13.03726 | 4.743 |