The Dexes / Satellite Decay / 53961
CelestialObjectDex · Satellite Decay
SES-21
53961 · 2026-04-02T15:31:59Z
Fixes
183
Observations
183
The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| start_utc | 2026-04-02T15:31:59.291328+00:00 |
|---|---|
| end_utc | 2026-08-09T16:40:30.848736+00:00 |
| family | celestialdex |
| norad_id | 53,961 |
| object_name | SES-21 |
| group | active |
| eccentricity_median | 0.000 |
| inclination_deg_median | 0.028 |
| n_snaps | 183 |
| span_days | 129.048 |
| mean_motion_first | 1.003 |
| mean_motion_last | 1.003 |
| delta_mean_motion | -0.000 |
| altitude_first_km | 35786.850 |
| altitude_last_km | 35787.348 |
| decay_rate_rev_day2 | 0.000 |
| altitude_decay_km_day | -0.016 |
| 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 | 2026-04-02T15:31:59.291328+00:00 |
| last_utc | 2026-08-09T16:40:30.848736+00:00 |
| last_fix_utc | 2026-08-09T16:40:30.848736+00:00 |
| provisional | false |
| track | [{"utc":"2026-04-02T15:31:59.291328+00:00","mean_motion":1.00270875,"altitude_km":35786.85,"eccentricity":0.00010299,"inclination_deg":0.0296},{"utc":"2026-04-04T05:12:39.510144+00:00","mean_motion":1 |
| total_sensor_hits | 0 |
Provenance
- celestrak
Storage: dossier · celestial_storehouse/satellite_decay/53961.json