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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 (11 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, Unknown HBR

Radar Cross Section

13.960 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 13 hours ago

TLE from 13 hours ago

0 NAVSTAR 70 (USA 251)
1 39741U 14026A   25261.23640133 -.00000104  00000-0  00000-0 0  9991
2 39741  56.6143 342.1033 0036042 317.0218  42.7420  2.00567395 83089

Epoch: 2025-09-18T05:40Z

TLE epoch observation values (Epoch: 2025-09-18T05:40:25.074Z)

Latitude

-0.00001°

Longitude

-100.3969°

Altitude

20,111.902 km

Speed

3.884 km/s

True Right ascension

22h 48m 26s

True Declination

0° 00' 00"

Sunlit

Object was in partial shadow 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

11:35:10

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

20,277.544 km

Perigee altitude

20,086.089 km

Semi-major axis

26,559.953 km

Eccentricity

0.0036

Inclination

56.6143°

RAAN

342.1033°

Arg. of periapsis

317.0218°

True anomaly

43.02324°

Mean anomaly

42.742°

Eccentric anomaly

42.88253°

Mean motion

0.50142 °/min

Orbital period

717.96 mins

BSTAR

0

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Other satellites on launch #26 in the year 2014 (2014-05-17 UTC)

DELTA 4 R/B, 39742

DELTA 4 DEB, 39754 (Decayed)

DELTA 4 DEB, 39755 (Decayed)

DELTA 4 DEB, 39756 (Decayed)

DELTA 4 DEB, 39757 (Decayed)

DELTA 4 DEB, 39758 (Decayed)

DELTA 4 DEB, 39759 (Decayed)

DELTA 4 DEB, 39760 (Decayed)

DELTA 4 DEB, 40003 (Decayed)

DELTA 4 DEB, 40004 (Decayed)

DELTA 4 DEB, 40005 (Decayed)

DELTA 4 DEB, 40006 (Decayed)

DELTA 4 DEB, 40007 (Decayed)

DELTA 4 DEB, 40008 (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.

Click here to try in Sandbox

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.
330 mins	2025-09-19 04:33:53.951Z	178.271° S	2025-09-19 07:07:53.951Z	104.371° ESE	44.323°	2025-09-19 10:03:53.951Z	60.981° ENE

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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