The Dexes / Satellite Decay / 39120
CelestialObjectDex · Satellite Decay
SBIRS GEO-2 (USA 241)
39120 · 2026-04-03T09:10:06Z
Fixes
213
Observations
213
The record
Everything the slot carries, as measured. Series arrays are drawn above and listed here in full.
| start_utc | 2026-04-03T09:10:06.658464+00:00 |
|---|---|
| end_utc | 2026-08-09T06:47:46.123872+00:00 |
| family | celestialdex |
| norad_id | 39,120 |
| object_name | SBIRS GEO-2 (USA 241) |
| group | active |
| eccentricity_median | 0.000 |
| inclination_deg_median | 4.465 |
| n_snaps | 213 |
| span_days | 127.901 |
| mean_motion_first | 1.003 |
| mean_motion_last | 1.003 |
| delta_mean_motion | 0.000 |
| altitude_first_km | 35786.612 |
| altitude_last_km | 35786.602 |
| decay_rate_rev_day2 | -0.000 |
| altitude_decay_km_day | 0.000 |
| 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 | 2026-04-03T09:10:06.658464+00:00 |
| last_utc | 2026-08-09T06:47:46.123872+00:00 |
| last_fix_utc | 2026-08-09T06:47:46.123872+00:00 |
| provisional | false |
| track | [{"utc":"2026-04-03T09:10:06.658464+00:00","mean_motion":1.00271724,"altitude_km":35786.612,"eccentricity":0.00022335,"inclination_deg":4.3278},{"utc":"2026-04-03T19:26:09.195360+00:00","mean_motion": |
| total_sensor_hits | 0 |
Provenance
- celestrak
Storage: dossier · celestial_storehouse/satellite_decay/39120.json