The Dexes / Satellite Decay / 56218
CelestialObjectDex · Satellite Decay
KEPLER-21
56218 · 2026-04-03T06:21:39Z
Fixes
139
Observations
139
The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| start_utc | 2026-04-03T06:21:39.547584+00:00 |
|---|---|
| end_utc | 2026-07-09T16:13:07.229568+00:00 |
| family | celestialdex |
| norad_id | 56,218 |
| object_name | KEPLER-21 |
| group | active |
| eccentricity_median | 0.001 |
| inclination_deg_median | 97.289 |
| n_snaps | 139 |
| span_days | 97.411 |
| mean_motion_first | 15.777 |
| mean_motion_last | 16.401 |
| delta_mean_motion | 0.624 |
| altitude_first_km | 336.927 |
| altitude_last_km | 165.577 |
| decay_rate_rev_day2 | 0.004 |
| altitude_decay_km_day | -1.171 |
| 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 | 2026-04-03T06:21:39.547584+00:00 |
| last_utc | 2026-07-09T16:13:07.229568+00:00 |
| last_fix_utc | 2026-07-09T16:13:07.229568+00:00 |
| provisional | false |
| track | [{"utc":"2026-04-03T06:21:39.547584+00:00","mean_motion":15.77711388,"altitude_km":336.927,"eccentricity":0.0000666,"inclination_deg":97.2941},{"utc":"2026-04-04T06:42:51.264864+00:00","mean_motion":1 |
| total_sensor_hits | 0 |
Provenance
- celestrak
Storage: dossier · celestial_storehouse/satellite_decay/56218.json