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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 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: 17 hours ago

TLE from 17 hours ago

0 NAVSTAR 70 (USA 251)
1 39741U 14026A   26257.21083856 -.00000095  00000-0  00000-0 0  9997
2 39741  56.4481 328.0490 0039345 324.1570  35.6413  2.00554646 90324

Epoch: 2026-09-14T05:03Z

TLE epoch observation values (Epoch: 2026-09-14T05:03:36.451Z)

Latitude

0.00005°

Longitude

-101.03261°

Altitude

20,098.438 km

Speed

3.886 km/s

True Right ascension

21h 52m 15s

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

14:35:02

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

20,287.453 km

Perigee altitude

20,078.444 km

Semi-major axis

26,561.086 km

Eccentricity

0.00393

Inclination

56.4481°

RAAN

328.049°

Arg. of periapsis

324.157°

True anomaly

35.90507°

Mean anomaly

35.6413°

Eccentric anomaly

35.77308°

Mean motion

0.50139 °/min

Orbital period

718.01 mins

BSTAR

0

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

DELTA 4 DEB, 40006 (Decayed)

DELTA 4 DEB, 40007 (Decayed)

DELTA 4 DEB, 39755 (Decayed)

DELTA 4 R/B, 39742

DELTA 4 DEB, 39756 (Decayed)

DELTA 4 DEB, 39754 (Decayed)

DELTA 4 DEB, 40005 (Decayed)

DELTA 4 DEB, 39758 (Decayed)

DELTA 4 DEB, 39760 (Decayed)

DELTA 4 DEB, 40008 (Decayed)

DELTA 4 DEB, 39759 (Decayed)

DELTA 4 DEB, 39757 (Decayed)

DELTA 4 DEB, 40003 (Decayed)

DELTA 4 DEB, 40004 (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.
333 mins	2026-09-15 03:55:57.642Z	179.14° S	2026-09-15 06:30:57.642Z	105.992° ESE	78.06°	2026-09-15 09:28:57.642Z	61.87° 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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