NAVSTAR 70 (USA 251), 39741
Orbit data source: Space-Track
NAVSTAR 70 (USA 251), 39741 is a payload satellite owned by USAF SMC (US) in MEO that was launched on Sat, 17 May 2014 UTC via a DELTA 4M+(4,2) 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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39741 intel report (Beta)
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Identifier
Orbit
Country
USRelated business
Manufacturer
Boeing/ES
Mission
Operational Defense Navigation
Bus & Motor
GPS IIF, AOCS
Mass
1,630 kg wet, ~1,500 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 9.0 m
Radar Cross Section
13.960 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 3 hours ago
TLE from 3 hours ago
0 NAVSTAR 70 (USA 251)
1 39741U 14026A 26138.54510104 -.00000069 00000-0 00000+0 0 9992
2 39741 56.5121 332.6713 0038530 326.8805 32.8940 2.00563079 87948Epoch: 2026-05-18T13:04Z
TLE epoch observation values (Epoch: 2026-05-18T13:04:56.729Z)
Latitude
-0.00006°
Longitude
-99.79526°
Altitude
20,097.021 km
Speed
3.887 km/s
True Right ascension
22h 10m 41s
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
00:28:51
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
20,284.539 km
Perigee altitude
20,079.865 km
Semi-major axis
26,560.339 km
Eccentricity
0.00385
Inclination
56.5121°
RAAN
332.6713°
Arg. of periapsis
326.8805°
True anomaly
33.13476°
Mean anomaly
32.894°
Eccentric anomaly
33.01428°
Mean motion
0.50141 °/min
Orbital period
717.98 mins
BSTAR
0
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Other satellites on launch #26 in the year 2014 (2014-05-17 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.NAVSTAR 70 (USA 251) 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. |
|---|---|---|---|---|---|---|---|
| 107 mins | 2026-05-18 15:43:57.701Z | 45.723° ENE | 2026-05-18 15:43:57.701Z | 45.723° ENE | 38.423° | 2026-05-18 17:30:57.701Z | 60.449° ENE |
| 225 mins | 2026-05-19 11:58:57.701Z | 177.711° S | 2026-05-19 14:31:57.701Z | 104.35° ESE | 44.241° | 2026-05-19 15:43:57.701Z | 45.53° ENE |
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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