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EXPLORER 22, 899

Orbit data source: Space-Track

EXPLORER 22, 899 is a payload satellite owned by GSFC (US) in LEO that was launched on Sat, 10 Oct 1964 UTC via an SCOUT X-4 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/899?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/899?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

899, 1964-064A

Orbit

LEO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

APL

Mission

Spacecraft

Bus & Motor

TRANSIT 5, Unknown motor

Mass

52 kg wet, 52 kg dry

Launch date (UTC)

1964-10-10 (62 years ago)

Launch vehicle

SCOUT X-4

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

OCT CYL + 4 PAN, 1.1 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 8 hours ago

TLE from 8 hours ago

0 EXPLORER 22
1   899U 64064A   26272.77472507  .00000130  00000-0  10798-3 0  9996
2   899  79.6938  12.5455 0118651 297.1354  61.7736 13.83078571119436

Epoch: 2026-09-29T18:35Z

TLE epoch observation values (Epoch: 2026-09-29T18:35:36.246Z)

Latitude

-0.00002°

Longitude

85.10957°

Altitude

915.458 km

Speed

7.415 km/s

True Right ascension

00h 50m 10s

True Declination

0° 00' 00"

Sunlit

Object was in full 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

20:14:47

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,037.229 km

Perigee altitude

863.325 km

Semi-major axis

7,328.414 km

Eccentricity

0.01187

Inclination

79.6938°

RAAN

12.5455°

Arg. of periapsis

297.1354°

True anomaly

62.97993°

Mean anomaly

61.7736°

Eccentric anomaly

62.37593°

Mean motion

3.45962 °/min

Orbital period

104.06 mins

BSTAR

0.00010798

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Other satellites on launch #64 in the year 1964 (1964-10-10 UTC)

SCOUT X-4 DEB, 976

SCOUT X-4 DEB, 977

SCOUT X-4 R/B, 907

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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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EXPLORER 22 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.
11 mins	2026-09-30 06:50:47.817Z	154.775° SSE	2026-09-30 06:55:47.817Z	99.679° ESE	35.005°	2026-09-30 07:01:47.817Z	28.85° NE
9 mins	2026-09-30 08:37:47.817Z	237.585° WSW	2026-09-30 08:41:47.817Z	296.34° NW	33.995°	2026-09-30 08:46:47.817Z	352.157° N
11 mins	2026-09-30 17:44:47.817Z	5.656° NNE	2026-09-30 17:49:47.817Z	67.162° ENE	42.949°	2026-09-30 17:55:47.817Z	141.577° SSE
9 mins	2026-09-30 19:30:47.817Z	320.738° NNW	2026-09-30 19:34:47.817Z	274.826° WNW	30.042°	2026-09-30 19:39:47.817Z	216.109° SW

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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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Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in descending order

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out EXPLORER 22, 899 on other resources

View EXPLORER 22, 899 on NASA - NSSDCA Website

View EXPLORER 22, 899 on Heavens-Above

View EXPLORER 22, 899 on Keep Track

View EXPLORER 22, 899 on Celestrak

View EXPLORER 22, 899 on Gunter's Space Page

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

EXPLORER 22, 899

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 8 hours ago

TLE from 8 hours ago

TLE epoch observation values (Epoch: 2026-09-29T18:35:36.246Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #64 in the year 1964 (1964-10-10 UTC)

EXPLORER 22 Visibility forecast

Co-orbital & Co-planar RSOs

Check out EXPLORER 22, 899 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 8 hours ago