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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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<iframe src="https://www.satcat.com/sats-embedded/39741?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/39741?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

39741, 2014-026A

Orbit

MEO

Country

US

Related business

United States Space Force (US)

Manufacturer

Boeing/ES

Mission

Operational Defense Navigation

Bus & Motor

GPS IIF, AOCS

Mass

1,630 kg wet, ~1,500 kg dry

Launch date (UTC)

2014-05-17 (12 years ago)

Launch vehicle

DELTA 4M+(4,2)

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 9.0 m

Radar Cross Section

13.960 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 15 hours ago

TLE from 15 hours ago

0 NAVSTAR 70 (USA 251)
1 39741U 14026A   25352.97552692 -.00000081  00000-0  00000-0 0  9999
2 39741  56.5812 338.5339 0039341 319.0443  40.6665  2.00561009 84924

Epoch: 2025-12-18T23:24Z

TLE epoch observation values (Epoch: 2025-12-18T23:24:45.525Z)

Latitude

-0.00005°

Longitude

-100.48985°

Altitude

20,103.834 km

Speed

3.886 km/s

True Right ascension

22h 34m 05s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

13:27:14

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

20,286.873 km

Perigee altitude

20,077.89 km

Semi-major axis

26,560.519 km

Eccentricity

0.00393

Inclination

56.5812°

RAAN

338.5339°

Arg. of periapsis

319.0443°

True anomaly

40.96137°

Mean anomaly

40.6665°

Eccentric anomaly

40.81383°

Mean motion

0.5014 °/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)

DELTA 4 DEB, 39759 (Decayed)

DELTA 4 DEB, 39760 (Decayed)

DELTA 4 DEB, 40003 (Decayed)

DELTA 4 DEB, 40007 (Decayed)

DELTA 4 DEB, 39757 (Decayed)

DELTA 4 R/B, 39742

DELTA 4 DEB, 39756 (Decayed)

DELTA 4 DEB, 40006 (Decayed)

DELTA 4 DEB, 40008 (Decayed)

DELTA 4 DEB, 39754 (Decayed)

DELTA 4 DEB, 39758 (Decayed)

DELTA 4 DEB, 40009 (Decayed)

DELTA 4 DEB, 39755 (Decayed)

DELTA 4 DEB, 40005 (Decayed)

Did you know?

You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

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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.
331 mins	2025-12-19 22:17:56.247Z	178.453° S	2025-12-20 00:51:56.247Z	105.362° ESE	44.327°	2025-12-20 03:48:56.247Z	61.242° ENE

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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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Check out NAVSTAR 70 (USA 251), 39741 on other resources

View NAVSTAR 70 (USA 251), 39741 on NASA - NSSDCA Website

View NAVSTAR 70 (USA 251), 39741 on Heavens-Above

View NAVSTAR 70 (USA 251), 39741 on Keep Track

View NAVSTAR 70 (USA 251), 39741 on Celestrak

View NAVSTAR 70 (USA 251), 39741 on Gunter's Space Page

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

Documentation

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