IUS R/B(1), 21640

Orbit data source: Space-Track

IUS R/B(1), 21640 is space debris in HEO originally from a launch on Fri, 02 Aug 1991 UTC launched from the Air Force Eastern Test Range (AFETR). Debris objects in space refer to the collection of defunct objects orbiting the Earth. Examples of debris include non-operational satellites, rocket bodies, and fragments generated from explosions, collisions, or faulty payload assembly.

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Iframe URL

https://www.satcat.com/sats-embedded/21640?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21640, 1991-054C

Orbit

HEO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

UTC CSD

Mission

Spacecraft

Bus & Motor

ORBUS 21, Unknown motor

Mass

1,164 kg wet, ~1,164 kg dry

Launch date (UTC)

1991-08-02 (35 years ago)

Launch vehicle

Unknown

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, Unknown HBR

Radar Cross Section

7.708 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 10 hours ago

TLE from 10 hours ago

0 IUS R/B(1)
1 21640U 91054C   26098.08497060  .00007266  00000-0  12503-2 0  9995
2 21640  26.5255  71.9460 6654382 158.8795 252.3942  3.11315576337837

Epoch: 2026-04-08T02:02Z

TLE epoch observation values (Epoch: 2026-04-08T02:02:21.459Z)

Latitude

-0.00004°

Longitude

-154.99389°

Altitude

22,704.576 km

Speed

2.701 km/s

True Right ascension

04h 47m 47s

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

18:28:01

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

26,624.262 km

Perigee altitude

251.555 km

Semi-major axis

19,816.045 km

Eccentricity

0.66544

Inclination

26.5255°

RAAN

71.946°

Arg. of periapsis

158.8795°

True anomaly

201.18483°

Mean anomaly

252.3942°

Eccentric anomaly

225.2957°

Mean motion

0.77807 °/min

Orbital period

462.68 mins

BSTAR

0.0012503

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Other satellites on launch #54 in the year 1991 (1991-08-02 UTC)

TDRS 5, 21639

IUS R/B(2), 21641

STS 43, 21638 (Decayed)

IUS DEB, 21642 (Decayed)

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IUS R/B(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.
335 mins	2026-04-08 21:39:23.730Z	212.025° SW	2026-04-09 03:01:23.730Z	184.078° SSW	39.73°	2026-04-09 03:14:23.730Z	108.978° ESE

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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 IUS R/B(1), 21640 on other resources

View IUS R/B(1), 21640 on Heavens-Above

View IUS R/B(1), 21640 on Keep Track

View IUS R/B(1), 21640 on Celestrak

View IUS R/B(1), 21640 on Gunter's Space Page

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

IUS R/B(1), 21640

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 10 hours ago

TLE from 10 hours ago

TLE epoch observation values (Epoch: 2026-04-08T02:02:21.459Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #54 in the year 1991 (1991-08-02 UTC)

IUS R/B(1) Visibility forecast

Co-orbital & Co-planar RSOs

Check out IUS R/B(1), 21640 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 10 hours ago