The Dexes / Satellite Decay / 28899
CelestialObjectDex · Satellite Decay
INMARSAT 4-F2
28899 · 2026-04-02T06:42:21Z
Fixes
176
Sensor hits
0
Observations
176
The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| start_utc | 2026-04-02T06:42:21.152736+00:00 |
|---|---|
| end_utc | 2026-08-09T17:58:50.814336+00:00 |
| family | celestialdex |
| norad_id | 28,899 |
| object_name | INMARSAT 4-F2 |
| group | active |
| eccentricity_median | 0.000 |
| inclination_deg_median | 5.082 |
| n_snaps | 176 |
| span_days | 129.470 |
| mean_motion_first | 1.003 |
| mean_motion_last | 1.003 |
| delta_mean_motion | -0.000 |
| altitude_first_km | 35786.709 |
| altitude_last_km | 35786.887 |
| decay_rate_rev_day2 | 0.000 |
| altitude_decay_km_day | -0.001 |
| 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 | 2026-04-02T06:42:21.152736+00:00 |
| last_utc | 2026-08-09T17:58:50.814336+00:00 |
| last_fix_utc | 2026-08-09T17:58:50.814336+00:00 |
| provisional | false |
| track | [{"utc":"2026-04-02T06:42:21.152736+00:00","mean_motion":1.00271378,"altitude_km":35786.709,"eccentricity":0.000325,"inclination_deg":4.997},{"utc":"2026-04-03T18:38:39.185952+00:00","mean_motion":1.0 |
Provenance
- celestrak
Storage: dossier · celestial_storehouse/satellite_decay/28899.json