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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

Last TLE update

23 hours ago

Origin

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

APL

Mission

Civil Science

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

Oct Cyl + 4 Pan + 2 Rod, 2.0 m

Radar Cross Section

1.165 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 23 hours ago

0 EXPLORER 22
1 00899U 64064A   25223.82652614  .00000141  00000-0  11775-3 0  9994
2 00899  79.6895 105.5223 0119465 281.8458  76.9315 13.82920473 62213

Epoch: 2025-08-11T19:50Z

TLE epoch observation values (Epoch: 2025-08-11T19:50:11.858Z)

Latitude

-0.00001°

Longitude

-152.55506°

Altitude

937.544 km

Speed

7.393 km/s

True Right ascension

07h 02m 05s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

54.47101°

Longitude

-138.91407°

Altitude

1,025.263 km

Speed

7.313 km/s

Apparent Right ascension

01h 00m 38s

Apparent Declination

52° 01' 14"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

09:06:08

Azimuth

327.036° NNW

Elevation

15.073°

Doppler factor

Orbital elements

Apogee altitude

1,038.392 km

Perigee altitude

863.281 km

Semi-major axis

7,328.973 km

Eccentricity

0.01195

Inclination

79.6895°

RAAN

105.5223°

Arg. of periapsis

281.8458°

True anomaly

78.26941°

Mean anomaly

76.9315°

Eccentric anomaly

77.60002°

Mean motion

3.45922 °/min

Orbital period

104.07 mins

BSTAR

0.00011775

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

SCOUT X-4 R/B, 907

SCOUT X-4 DEB, 976

SCOUT X-4 DEB, 977

EXPLORER 22 Visibility forecast

Observer location: undefined°, undefined°
Set Observer location

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	2025-08-13 03:40:45.176Z	351.902° N	2025-08-13 03:46:45.176Z	123.635° SE	43.963°	2025-08-13 03:51:45.176Z	164.592° S
5 mins	2025-08-13 05:28:45.176Z	296.115° NW	2025-08-13 05:30:45.176Z	275.863° WNW	14.712°	2025-08-13 05:33:45.176Z	246.536° WSW
5 mins	2025-08-13 15:24:45.176Z	101.503° ESE	2025-08-13 15:26:45.176Z	79.986° E	15.189°	2025-08-13 15:29:45.176Z	51.411° ENE
11 mins	2025-08-13 17:05:45.176Z	198.086° SSW	2025-08-13 17:10:45.176Z	274.595° WNW	43.989°	2025-08-13 17:16:45.176Z	7.466° NNE

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 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.