IUS R/B(2), 21641

Orbit data source: Space-Track

IUS R/B(2), 21641 is space debris in GEO 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/21641?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21641, 1991-054D

Orbit

GEO

Last TLE update

1 day ago

Origin

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

UTC CSD

Mission

Orbus 6E) (Atlantis (OV-104))"

Bus & Motor

ORBUS 6, Unknown motor

Mass

~1,100 kg wet, ~1,100 kg dry

Launch date (UTC)

1991-08-02 (34 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

8.086 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 1 day ago

0 IUS R/B(2)
1 21641U 91054D   25213.51587699  .00000113  00000-0  00000+0 0  9990
2 21641  14.1048 335.5679 0034754 338.4872  22.9434  1.00345300122724

Epoch: 2025-08-01T12:22Z

TLE epoch observation values (Epoch: 2025-08-01T12:22:51.771Z)

Latitude

0.37618°

Longitude

-158.98174°

Altitude

35,630.215 km

Speed

3.085 km/s

True Right ascension

22h 28m 23s

True Declination

0° 22' 33"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

12.26913°

Longitude

-100.67245°

Altitude

35,744.209 km

Speed

3.077 km/s

Apparent Right ascension

01h 57m 59s

Apparent Declination

7° 12' 49"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

05:57:45

Azimuth

255.471° W

Elevation

27.496°

Doppler factor

Orbital elements

Apogee altitude

35,913.448 km

Perigee altitude

35,620.505 km

Semi-major axis

42,145.113 km

Eccentricity

0.00348

Inclination

14.1048°

RAAN

335.5679°

Arg. of periapsis

338.4872°

True anomaly

23.09927°

Mean anomaly

22.9434°

Eccentric anomaly

23.02127°

Mean motion

0.25085 °/min

Orbital period

1,435.09 mins

BSTAR

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

STS 43, 21638 (Decayed)

TDRS 5, 21639

IUS R/B(1), 21640

IUS DEB, 21642 (Decayed)

IUS R/B(2) 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.
666 mins	2025-08-02 16:12:11.723Z	255.454° W	2025-08-02 18:40:11.723Z	256.324° W	26.209°	2025-08-03 03:18:11.723Z	238.109° WSW
470 mins	2025-08-03 08:22:11.723Z	235.595° WSW	2025-08-03 16:12:11.723Z	255.372° W	25.02°	2025-08-03 16:12:11.723Z	255.372° W

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21641 neighbors

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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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Check out IUS R/B(2), 21641 on other resources

View IUS R/B(2), 21641 on Heavens-Above

View IUS R/B(2), 21641 on Keep Track

View IUS R/B(2), 21641 on Celestrak

View IUS R/B(2), 21641 on Gunter's Space Page

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