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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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<iframe src="https://www.satcat.com/sats-embedded/56164?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/56164?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

56164, 2023-050C

Orbit

LEO

Last TLE update

20 hours ago

Origin

Space Development Agency (US)

Manufacturer

York Space Sys

Mission

Operational Defense Communications

Bus & Motor

S-CLASS, Unknown motor

Mass

~300 kg wet, ~300 kg dry

Launch date (UTC)

2023-04-02 (2 years ago)

Launch vehicle

FALCON 9

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 1 Pan, 1.0 m

Radar Cross Section

0.945 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 20 hours ago

0 CHECKMATE 4
1 56164U 23050C   25213.72268808  .00000069  00000-0  51023-4 0  9996
2 56164  81.0018  18.1510 0006301 113.1619 247.0201 13.84761791117923

Epoch: 2025-08-01T17:20Z

TLE epoch observation values (Epoch: 2025-08-01T17:20:40.25Z)

Latitude

-0.00004°

Longitude

167.41416°

Altitude

951.707 km

Speed

7.375 km/s

True Right ascension

01h 12m 36s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-67.96317°

Longitude

143.69307°

Altitude

977.23 km

Speed

7.36 km/s

Apparent Right ascension

17h 51m 28s

Apparent Declination

-68° 48' 47"

Sunlit

Object is in full shadow

Visualization observer readout

Local Sidereal Time

03:34:12

Azimuth

201.263° SSW

Elevation

-55.816°

Doppler factor

Orbital elements

Apogee altitude

948.879 km

Perigee altitude

939.652 km

Semi-major axis

7,322.402 km

Eccentricity

0.00063

Inclination

81.0018°

RAAN

18.151°

Arg. of periapsis

113.1619°

True anomaly

246.95365°

Mean anomaly

247.0201°

Eccentric anomaly

246.98687°

Mean motion

3.46388 °/min

Orbital period

103.93 mins

BSTAR

0.000051023

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Other satellites on launch #50 in the year 2023 (2023-04-02 UTC)

CHECKMATE 4 Visibility forecast

Observer location: undefined°, undefined°

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.
9 mins	2025-08-02 21:40:02.179Z	15.776° NNE	2025-08-02 21:45:02.179Z	75.111° E	24.164°	2025-08-02 21:49:02.179Z	121.927° SE
9 mins	2025-08-02 23:26:02.179Z	328.318° NNW	2025-08-02 23:30:02.179Z	263.983° W	34.208°	2025-08-02 23:35:02.179Z	200.476° SSW
9 mins	2025-08-03 11:05:02.179Z	155.628° SSE	2025-08-03 11:09:02.179Z	97.589° ESE	34.56°	2025-08-03 11:14:02.179Z	26.367° NE
8 mins	2025-08-03 12:51:02.179Z	245.952° WSW	2025-08-03 12:54:02.179Z	284.051° WNW	23.869°	2025-08-03 12:59:02.179Z	343.599° N

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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Authenticating...

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Check out CHECKMATE 4, 56164 on other resources

View CHECKMATE 4, 56164 on NASA - NSSDCA Website

View CHECKMATE 4, 56164 on Heavens-Above

View CHECKMATE 4, 56164 on Keep Track

View CHECKMATE 4, 56164 on Celestrak

View CHECKMATE 4, 56164 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.