STARLINK-3521, 51742
Orbit data source: Space-Track
STARLINK-3521, 51742 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Mon, 21 Feb 2022 UTC via an FALCON 9 launch vehicle from the Air Force Eastern Test Range (AFETR). 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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
51742 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Edit Sat Name
Focus sentinelFocus sentinel
Create New Watchlist
Identifier
Orbit
Country
USRelated business
Manufacturer
SpaceX/Seattle
Mission
Operational Commercial Communications
Bus & Motor
STARLINK, Unknown motor
Mass
297 kg wet, ~275 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 1 Pan, 10.1 m
Radar Cross Section
13.562 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 STARLINK-3521
1 51742U 22016AE 26171.38314866 .00000503 00000-0 49667-4 0 9990
2 51742 53.1600 218.1893 0001416 74.9271 285.1877 15.08843375239062Epoch: 2026-06-20T09:11Z
TLE epoch observation values (Epoch: 2026-06-20T09:11:44.044Z)
Latitude
-0.00001°
Longitude
171.65721°
Altitude
540.368 km
Speed
7.594 km/s
True Right ascension
14h 32m 45s
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
21:34:05
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
540.967 km
Perigee altitude
539.008 km
Semi-major axis
6,918.124 km
Eccentricity
0.00014
Inclination
53.16°
RAAN
218.1893°
Arg. of periapsis
74.9271°
True anomaly
285.17204°
Mean anomaly
285.1877°
Eccentric anomaly
285.17987°
Mean motion
3.7719 °/min
Orbital period
95.44 mins
BSTAR
0.000049667
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #16 in the year 2022 (2022-02-21 UTC)
Did you know?
You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.STARLINK-3521 Visibility forecast
Loading observer location...
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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2026-06-22 10:56:03.678Z | 334.309° NNW | 2026-06-22 10:59:03.678Z | 32.221° NE | 23.419° | 2026-06-22 11:02:03.678Z | 82.527° E |
| 6 mins | 2026-06-22 12:36:03.678Z | 296.487° NW | 2026-06-22 12:38:03.678Z | 249.299° W | 39.72° | 2026-06-22 12:42:03.678Z | 145.691° SSE |
| 5 mins | 2026-06-23 04:08:03.678Z | 166.148° S | 2026-06-23 04:10:03.678Z | 121.657° SE | 22.767° | 2026-06-23 04:13:03.678Z | 73.976° E |
| 6 mins | 2026-06-23 05:46:03.678Z | 257.737° W | 2026-06-23 05:49:03.678Z | 334.15° NNW | 35.359° | 2026-06-23 05:52:03.678Z | 36.568° NE |
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 |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
|---|