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SECOR 13 (EGRS 13), 3891

Orbit data source: Space-Track

SECOR 13 (EGRS 13), 3891 is a payload satellite owned by USA ETL (US) in SSO that was launched on Mon, 14 Apr 1969 UTC via a THORAD SLV-2G AGENA D 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 src="https://www.satcat.com/sats-embedded/3891?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/3891?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

3891, 1969-037B

Orbit

SSO

Last TLE update

10 hours ago

Origin

United States Army (US)

Manufacturer

ITT

Mission

Defense Geodetic

Bus & Motor

SECOR, Unknown motor

Mass

18 kg wet, 18 kg dry

Launch date (UTC)

1969-04-14 (56 years ago)

Launch vehicle

THORAD SLV-2G AGENA D

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box, 0.2 m

Radar Cross Section

0.095 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 10 hours ago

0 SECOR 13 (EGRS 13)
1 03891U 69037B   25214.53483896 -.00000044  00000-0 -26290-5 0  9990
2 03891  99.6960  94.0971 0038935 314.2416 112.4745 13.42959306758984

Epoch: 2025-08-02T12:50Z

TLE epoch observation values (Epoch: 2025-08-02T12:50:10.086Z)

Latitude

65.34488°

Longitude

-71.55146°

Altitude

1,120.702 km

Speed

7.293 km/s

True Right ascension

04h 49m 26s

True Declination

65° 13' 14"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-21.98775°

Longitude

-45.46704°

Altitude

1,079.941 km

Speed

7.324 km/s

Apparent Right ascension

04h 19m 28s

Apparent Declination

-37° 49' 09"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

12:54:01

Azimuth

256.005° W

Elevation

-50.513°

Doppler factor

Orbital elements

Apogee altitude

1,124.685 km

Perigee altitude

1,066.487 km

Semi-major axis

7,473.723 km

Eccentricity

0.00389

Inclination

99.696°

RAAN

94.0971°

Arg. of periapsis

314.2416°

True anomaly

112.88601°

Mean anomaly

112.4745°

Eccentric anomaly

112.68033°

Mean motion

3.35921 °/min

Orbital period

107.17 mins

BSTAR

-0.000002629

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Other satellites on launch #37 in the year 1969 (1969-04-14 UTC)

NIMBUS 3, 3890

THORAD AGENA D R/B, 3892

SECOR 13 (EGRS 13) Visibility forecast

Observer location: undefined°, undefined°

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.
8 mins	2025-08-03 03:27:19.642Z	56.194° ENE	2025-08-03 03:31:19.642Z	96.1° ESE	17.549°	2025-08-03 03:35:19.642Z	132.8° SE
11 mins	2025-08-03 05:12:19.642Z	8.806° NNE	2025-08-03 05:17:19.642Z	273.659° WNW	43.819°	2025-08-03 05:23:19.642Z	205.114° SW
4 mins	2025-08-03 07:00:19.642Z	318.911° NNW	2025-08-03 07:01:19.642Z	309.561° NW	13.192°	2025-08-03 07:04:19.642Z	282.309° WNW
11 mins	2025-08-03 15:27:19.642Z	142.286° SSE	2025-08-03 15:32:19.642Z	54.488° ENE	40.327°	2025-08-03 15:38:19.642Z	353.215° N
8 mins	2025-08-03 17:14:19.642Z	226.205° WSW	2025-08-03 17:18:19.642Z	271.17° WNW	21.436°	2025-08-03 17:22:19.642Z	312.244° NW

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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Check out SECOR 13 (EGRS 13), 3891 on other resources

View SECOR 13 (EGRS 13), 3891 on NASA - NSSDCA Website

View SECOR 13 (EGRS 13), 3891 on Heavens-Above

View SECOR 13 (EGRS 13), 3891 on Keep Track

View SECOR 13 (EGRS 13), 3891 on Celestrak

View SECOR 13 (EGRS 13), 3891 on Gunter's Space Page

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