CHECKMATE 4, 56164
Orbit data source: Space-Track
CHECKMATE 4, 56164 is a payload satellite owned by SDA (US) in LEO that was launched on Sun, 02 Apr 2023 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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56164 intel report (Beta)
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Identifier
Orbit
Country
USRelated business
Manufacturer
York Space Sys
Mission
Operational Defense Communications
Bus & Motor
S-CLASS, Unknown motor
Mass
~300 kg wet, ~300 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 1 Pan, 1.0 m
Radar Cross Section
0.945 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 CHECKMATE 4
1 56164U 23050C 26171.18411976 .00000093 00000-0 72526-4 0 9994
2 56164 81.0016 68.9655 0005528 337.4683 22.6230 13.84815746162554Epoch: 2026-06-20T04:25Z
TLE epoch observation values (Epoch: 2026-06-20T04:25:07.947Z)
Latitude
0.00004°
Longitude
94.28001°
Altitude
945.974 km
Speed
7.381 km/s
True Right ascension
04h 35m 51s
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
21:42:54
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
948.123 km
Perigee altitude
940.027 km
Semi-major axis
7,322.212 km
Eccentricity
0.00055
Inclination
81.0016°
RAAN
68.9655°
Arg. of periapsis
337.4683°
True anomaly
22.64738°
Mean anomaly
22.623°
Eccentric anomaly
22.63519°
Mean motion
3.46401 °/min
Orbital period
103.93 mins
BSTAR
0.000072526
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Other satellites on launch #50 in the year 2023 (2023-04-02 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.CHECKMATE 4 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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2026-06-22 17:12:51.497Z | 162.307° S | 2026-06-22 17:17:51.497Z | 98.293° ESE | 35.825° | 2026-06-22 17:22:51.497Z | 25.168° NE |
| 8 mins | 2026-06-22 18:59:51.497Z | 247.377° WSW | 2026-06-22 19:02:51.497Z | 284.215° WNW | 22.791° | 2026-06-22 19:07:51.497Z | 342.659° N |
| 9 mins | 2026-06-23 04:06:51.497Z | 12.746° NNE | 2026-06-23 04:10:51.497Z | 80.398° E | 34.978° | 2026-06-23 04:15:51.497Z | 144.574° SSE |
| 8 mins | 2026-06-23 05:51:51.497Z | 315.682° NNW | 2026-06-23 05:54:51.497Z | 279.737° WNW | 23.087° | 2026-06-23 05:59:51.497Z | 221.111° SW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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