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OPS 5111 (NAVSTAR 1), 10684

Orbit data source: Space-Track

OPS 5111 (NAVSTAR 1), 10684 is a payload satellite owned by SAMSO (US) in MEO that was launched on Wed, 22 Feb 1978 UTC via an ATLAS F/SVS launch vehicle from the Air Force Western Test Range (AFWTR). 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/10684?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

10684, 1978-020A

Orbit

MEO

Country

Related business

USAF Space and Missile Systems Organization (US)

Manufacturer

Rockwell/SB

Mission

Non-operational spacecraft

Bus & Motor

GPS, STAR 27

Mass

775 kg wet, 409 kg dry

Launch date (UTC)

1978-02-22 (48 years ago)

Launch vehicle

ATLAS F/SVS

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 3 days ago

TLE from 3 days ago

0 OPS 5111 (NAVSTAR 1)
1 10684U 78020A   26092.18975692 -.00000050  00000-0  00000-0 0  9998
2 10684  64.2961  54.5964 0081164 219.1725 140.2083  1.98072338334930

Epoch: 2026-04-02T04:33Z

TLE epoch observation values (Epoch: 2026-04-02T04:33:14.997Z)

Latitude

-0.00001°

Longitude

155.72165°

Altitude

20,572.854 km

Speed

3.834 km/s

True Right ascension

03h 38m 18s

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

08:51:22

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

20,621.49 km

Perigee altitude

20,186.739 km

Semi-major axis

26,782.251 km

Eccentricity

0.00812

Inclination

64.2961°

RAAN

54.5964°

Arg. of periapsis

219.1725°

True anomaly

140.79893°

Mean anomaly

140.2083°

Eccentric anomaly

140.50407°

Mean motion

0.49519 °/min

Orbital period

726.99 mins

BSTAR

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Other satellites on launch #20 in the year 1978 (1978-02-22 UTC)

ATLAS F R/B, 10801 (Decayed)

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OPS 5111 (NAVSTAR 1) 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.
284 mins	2026-04-05 07:25:06.511Z	321.16° NNW	2026-04-05 09:53:06.511Z	274.45° WNW	42.144°	2026-04-05 12:09:06.511Z	205.995° SW
182 mins	2026-04-05 17:38:06.511Z	101.5° ESE	2026-04-05 19:10:06.511Z	59.654° ENE	26.415°	2026-04-05 20:40:06.511Z	24.836° NE

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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 OPS 5111 (NAVSTAR 1), 10684 on other resources

View OPS 5111 (NAVSTAR 1), 10684 on NASA - NSSDCA Website

View OPS 5111 (NAVSTAR 1), 10684 on Heavens-Above

View OPS 5111 (NAVSTAR 1), 10684 on Keep Track

View OPS 5111 (NAVSTAR 1), 10684 on Celestrak

View OPS 5111 (NAVSTAR 1), 10684 on Gunter's Space Page

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

OPS 5111 (NAVSTAR 1), 10684

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 3 days ago

TLE from 3 days ago

TLE epoch observation values (Epoch: 2026-04-02T04:33:14.997Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #20 in the year 1978 (1978-02-22 UTC)

OPS 5111 (NAVSTAR 1) Visibility forecast

Co-orbital & Co-planar RSOs

Check out OPS 5111 (NAVSTAR 1), 10684 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 3 days ago