NAVSTAR 77 (USA 289), 43873
Orbit data source: Space-Track
NAVSTAR 77 (USA 289), 43873 is a payload satellite owned by USAF SMC (US) in MEO that was launched on Sun, 23 Dec 2018 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.
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43873 intel report (Beta)
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Identifier
Orbit
Country
USRelated business
Manufacturer
LMSS Denver
Mission
Operational Defense Navigation
Bus & Motor
A2100, LEROS-1C?
Mass
4,400 kg wet, ~2,160 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 7.0 m
Radar Cross Section
13.646 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 NAVSTAR 77 (USA 289)
1 43873U 18109A 26171.21185719 -.00000019 00000-0 00000+0 0 9995
2 43873 55.6840 92.0670 0038226 197.8624 309.8411 2.00561777 55132Epoch: 2026-06-20T05:05Z
TLE epoch observation values (Epoch: 2026-06-20T05:05:04.461Z)
Latitude
26.4558°
Longitude
-92.43613°
Altitude
20,118.434 km
Speed
3.884 km/s
True Right ascension
16h 49m 02s
True Declination
26° 25' 08"
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
21:24:11
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
20,283.88 km
Perigee altitude
20,080.82 km
Semi-major axis
26,560.487 km
Eccentricity
0.00382
Inclination
55.684°
RAAN
92.067°
Arg. of periapsis
197.8624°
True anomaly
309.50373°
Mean anomaly
309.8411°
Eccentric anomaly
309.67252°
Mean motion
0.50141 °/min
Orbital period
717.98 mins
BSTAR
0
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Other satellites on launch #109 in the year 2018 (2018-12-23 UTC)
No other RSOs were in this launch
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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.NAVSTAR 77 (USA 289) 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. |
|---|---|---|---|---|---|---|---|
| 377 mins | 2026-06-23 00:37:11.867Z | 271.428° WNW | 2026-06-23 04:09:11.867Z | 56.054° ENE | 44.846° | 2026-06-23 06:54:11.867Z | 160.667° S |
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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