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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 (61 years ago)

Launch vehicle

SCOUT X-4

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 17 hours ago

TLE from 17 hours ago

0 EXPLORER 22
1 00899U 64064A   25352.38620281  .00000214  00000-0  18076-3 0  9995
2 00899  79.6906 324.8472 0119183 311.4850  47.6115 13.82988024 79982

Epoch: 2025-12-18T09:16Z

TLE epoch observation values (Epoch: 2025-12-18T09:16:07.922Z)

Latitude

-0.0001°

Longitude

98.57172°

Altitude

897.775 km

Speed

7.433 km/s

True Right ascension

21h 39m 23s

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

01:31:05

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,037.943 km

Perigee altitude

863.251 km

Semi-major axis

7,328.734 km

Eccentricity

0.01192

Inclination

79.6906°

RAAN

324.8472°

Arg. of periapsis

311.485°

True anomaly

48.6304°

Mean anomaly

47.6115°

Eccentric anomaly

48.11993°

Mean motion

3.45939 °/min

Orbital period

104.06 mins

BSTAR

0.00018076

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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 R/B, 907

SCOUT X-4 DEB, 977

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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.
7 mins	2025-12-19 08:25:44.607Z	28.015° NE	2025-12-19 08:28:44.607Z	57.188° ENE	16.463°	2025-12-19 08:32:44.607Z	97.282° ESE
12 mins	2025-12-19 10:09:44.607Z	345.572° N	2025-12-19 10:15:44.607Z	217.58° SW	44.07°	2025-12-19 10:21:44.607Z	175.708° S
6 mins	2025-12-19 21:52:44.607Z	117.445° SE	2025-12-19 21:55:44.607Z	80.217° E	19.366°	2025-12-19 21:58:44.607Z	47.954° ENE
10 mins	2025-12-19 23:35:44.607Z	213.154° SW	2025-12-19 23:39:44.607Z	275.545° WNW	39.217°	2025-12-19 23:45:44.607Z	1.848° NNE

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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: 17 hours ago

TLE from 17 hours ago

TLE epoch observation values (Epoch: 2025-12-18T09:16:07.922Z)

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: 17 hours ago