USA 31, 19458
Orbit data source: Space-Track
USA 31, 19458 is an American payload satellite in HEO that was launched on Fri, 02 Sep 1988 UTC via a TITAN 34D/TRANSTAGE 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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Identifier
Orbit
Country
USRelated business
Manufacturer
TRW
Mission
Defense Sigint
Bus & Motor
VORTEX, Unknown motor
Mass
~1,000 kg wet, ~900 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan + 1 Dish, 15.0 m
Radar Cross Section
36.563 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 USA 31
1 19458U 88077A 26171.17051262 .00000116 00000-0 17034-1 0 9992
2 19458 27.6966 10.4622 7304360 180.8075 176.5174 2.00759979 15388Epoch: 2026-06-20T04:05Z
TLE epoch observation values (Epoch: 2026-06-20T04:05:32.290Z)
Latitude
-0°
Longitude
40.69235°
Altitude
39,509.661 km
Speed
1.535 km/s
True Right ascension
00h 41m 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
23:08:40
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
39,558.99 km
Perigee altitude
777.86 km
Semi-major axis
26,546.562 km
Eccentricity
0.73044
Inclination
27.6966°
RAAN
10.4622°
Arg. of periapsis
180.8075°
True anomaly
179.20553°
Mean anomaly
176.5174°
Eccentric anomaly
177.98727°
Mean motion
0.5018 °/min
Orbital period
717.42 mins
BSTAR
0.017034
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Other satellites on launch #77 in the year 1988 (1988-09-02 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.USA 31 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. |
|---|---|---|---|---|---|---|---|
| 581 mins | 2026-06-22 12:06:23.727Z | 188.112° SSW | 2026-06-22 21:37:23.727Z | 213.418° SW | 37.91° | 2026-06-22 21:47:23.727Z | 138.755° SSE |
| 62 mins | 2026-06-23 11:04:23.727Z | 192.225° SSW | 2026-06-23 12:06:23.727Z | 187.72° SSW | 23.39° | 2026-06-23 12:06:23.727Z | 187.72° SSW |
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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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 |
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