FLOCK 3S 2, 43821 (Decayed)
Orbit data source: Space-Track
FLOCK 3S 2, 43821 was a payload satellite owned by Planet (US) in LEO that was launched on Mon, 03 Dec 2018 UTC via an FALCON 9 launch vehicle from the Air Force Western Test Range (AFWTR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
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43821 intel report (Beta)
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Identifier
Orbit
Country
USRelated business
Manufacturer
Planet
Mission
Decayed Commercial Imaging
Bus & Motor
CUBESAT 3U, Unknown motor
Mass
4.7 kg wet, 4.7 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 1.0 m
Radar Cross Section
0.108 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 10 months ago
TLE from 10 months ago
0 FLOCK 3S 2
1 43821U 18099BR 25245.58205734 .07949261 24853-5 21745-2 0 9993
2 43821 97.4717 326.6260 0007594 302.3169 57.7388 16.28035396370673Epoch: 2025-09-02T13:58Z
TLE epoch observation values (Epoch: 2025-09-02T13:58:09.754Z)
Latitude
0°
Longitude
135.11413°
Altitude
198.395 km
Speed
7.789 km/s
True Right ascension
21h 46m 30s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
13:40:33
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
199.643 km
Perigee altitude
189.66 km
Semi-major axis
6,572.788 km
Eccentricity
0.00076
Inclination
97.4717°
RAAN
326.626°
Arg. of periapsis
302.3169°
True anomaly
57.81242°
Mean anomaly
57.7388°
Eccentric anomaly
57.77561°
Mean motion
4.07304 °/min
Orbital period
88.39 mins
BSTAR
0.0021745
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Other satellites on launch #99 in the year 2018 (2018-12-03 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.FLOCK 3S 2 Visibility forecast
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Span | Click to sort rows by Start time (UTC) header in descending order | Start Az. | Max El. time (UTC) | Max El. Az. | Max El. | End time (UTC) | End Az. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2026-06-25 16:41:01.613Z | 254.876° W | 2026-06-25 16:45:01.613Z | 217.796° SW | 42.759° | 2026-06-25 16:46:01.613Z | 97.428° ESE |
| 4 mins | 2026-06-25 17:28:01.613Z | 250.129° W | 2026-06-25 17:30:01.613Z | 36.392° NE | 27.275° | 2026-06-25 17:32:01.613Z | 129.427° SE |
| 7 mins | 2026-06-25 18:06:01.613Z | 207.341° SW | 2026-06-25 18:06:01.613Z | 207.341° SW | 39.502° | 2026-06-25 18:13:01.613Z | 223.808° SW |
| 4 mins | 2026-06-25 18:25:01.613Z | 219.616° SW | 2026-06-25 18:28:01.613Z | 140.748° SSE | 39.385° | 2026-06-25 18:29:01.613Z | 268.718° W |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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