The Dexes / Satellite Decay / 66174
CelestialObjectDex · Satellite Decay
HTV-X1
66174 · 2026-04-03T15:01:57Z
Fixes
74
Observations
74
The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| start_utc | 2026-04-03T15:01:57.716544+00:00 |
|---|---|
| end_utc | 2026-05-26T01:02:49.632000+00:00 |
| family | celestialdex |
| norad_id | 66,174 |
| object_name | HTV-X1 |
| group | active |
| eccentricity_median | 0.001 |
| inclination_deg_median | 51.636 |
| n_snaps | 74 |
| span_days | 52.417 |
| mean_motion_first | 15.325 |
| mean_motion_last | 15.650 |
| delta_mean_motion | 0.325 |
| altitude_first_km | 468.307 |
| altitude_last_km | 373.214 |
| decay_rate_rev_day2 | 0.008 |
| altitude_decay_km_day | -2.451 |
| decay_note | mean_motion slope (rev/day^2) and altitude slope (km/day) from least-squares fit of measured GP elements; altitude from Kepler a=(GM/n^2)^(1/3) - R_earth |
| first_utc | 2026-04-03T15:01:57.716544+00:00 |
| last_utc | 2026-05-26T01:02:49.632000+00:00 |
| last_fix_utc | 2026-05-26T01:02:49.632000+00:00 |
| provisional | false |
| track | [{"utc":"2026-04-03T15:01:57.716544+00:00","mean_motion":15.32516519,"altitude_km":468.307,"eccentricity":0.00072843,"inclination_deg":51.6359},{"utc":"2026-04-03T19:43:39.982656+00:00","mean_motion": |
| total_sensor_hits | 0 |
Provenance
- celestrak
Storage: dossier · celestial_storehouse/satellite_decay/66174.json