The Dexes / Satellite Decay / 21639
CelestialObjectDex · Satellite Decay
TDRS 5
21639 · 2026-04-03T10:31:38Z
Fixes
178
Observations
178
The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| start_utc | 2026-04-03T10:31:38.515872+00:00 |
|---|---|
| end_utc | 2026-08-09T12:01:46.362720+00:00 |
| family | celestialdex |
| norad_id | 21,639 |
| object_name | TDRS 5 |
| group | active |
| eccentricity_median | 0.001 |
| inclination_deg_median | 14.072 |
| n_snaps | 178 |
| span_days | 128.063 |
| mean_motion_first | 1.003 |
| mean_motion_last | 1.003 |
| delta_mean_motion | -0.000 |
| altitude_first_km | 35784.617 |
| altitude_last_km | 35788.423 |
| decay_rate_rev_day2 | 0.000 |
| altitude_decay_km_day | -0.006 |
| 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 | 2026-04-03T10:31:38.515872+00:00 |
| last_utc | 2026-08-09T12:01:46.362720+00:00 |
| last_fix_utc | 2026-08-09T12:01:46.362720+00:00 |
| provisional | false |
| track | [{"utc":"2026-04-03T10:31:38.515872+00:00","mean_motion":1.00278841,"altitude_km":35784.617,"eccentricity":0.0008779,"inclination_deg":14.081},{"utc":"2026-04-04T05:27:31.958208+00:00","mean_motion":1 |
| total_sensor_hits | 0 |
Provenance
- celestrak
Storage: dossier · celestial_storehouse/satellite_decay/21639.json