DELTA 1 DEB, 21550

Orbit data source: Space-Track

DELTA 1 DEB, 21550 is space debris in SSO originally from a launch on Thu, 12 Jun 1975 UTC launched from the Air Force Western Test Range (AFWTR). 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 src="https://www.satcat.com/sats-embedded/21550?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/21550?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21550, 1975-052HE

Orbit

SSO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

Unknown

Mission

Spacecraft

Bus & Motor

Unknown

Mass

Unknown

Launch date (UTC)

1975-06-12 (51 years ago)

Launch vehicle

Unknown

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown shape, 0.1 m

Radar Cross Section

Small (<0.1 m²)

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Last TLE update: 1 day ago

TLE from 1 day ago

0 DELTA 1 DEB
1 21550U 75052HE  26064.69219109 -.00000100  00000-0 -26606-3 0  9993
2 21550  99.8555 338.3329 0544806 212.9255 175.9896 12.46012081579573

Epoch: 2026-03-05T16:36Z

TLE epoch observation values (Epoch: 2026-03-05T16:36:45.310Z)

Latitude

28.88941°

Longitude

-79.7702°

Altitude

1,911.879 km

Speed

6.746 km/s

True Right ascension

22h 11m 25s

True Declination

28° 45' 52"

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

22:58:53

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,906.701 km

Perigee altitude

1,050.615 km

Semi-major axis

7,856.795 km

Eccentricity

0.05448

Inclination

99.8555°

RAAN

338.3329°

Arg. of periapsis

212.9255°

True anomaly

176.39838°

Mean anomaly

175.9896°

Eccentric anomaly

176.19666°

Mean motion

3.11656 °/min

Orbital period

115.51 mins

BSTAR

-0.00026606

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Other satellites on launch #52 in the year 1975 (1975-06-12 UTC)

DELTA 1 DEB, 21369 (Decayed)

DELTA 1 DEB, 37629 (Decayed)

DELTA 1 DEB, 21451 (Decayed)

DELTA 1 DEB, 21447 (Decayed)

DELTA 1 DEB, 42660 (Decayed)

DELTA 1 DEB, 21295

DELTA 1 DEB, 26826

DELTA 1 DEB, 21330

DELTA 1 DEB, 27574 (Decayed)

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DELTA 1 DEB 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.
17 mins	2026-03-06 19:30:16.258Z	211.891° SW	2026-03-06 19:38:16.258Z	265.278° W	27.294°	2026-03-06 19:47:16.258Z	325.748° NNW
10 mins	2026-03-07 05:46:16.258Z	42.686° NE	2026-03-07 05:51:16.258Z	87.902° E	24.241°	2026-03-07 05:56:16.258Z	139.612° SSE
13 mins	2026-03-07 07:39:16.258Z	4.949° NNE	2026-03-07 07:46:16.258Z	279.906° WNW	39.771°	2026-03-07 07:52:16.258Z	217.804° SW
17 mins	2026-03-07 16:45:16.258Z	122.592° SE	2026-03-07 16:53:16.258Z	62.839° ENE	33.709°	2026-03-07 17:02:16.258Z	358.117° N
19 mins	2026-03-07 18:37:16.258Z	184.064° SSW	2026-03-07 18:46:16.258Z	255.71° W	40.412°	2026-03-07 18:56:16.258Z	337.263° NNW

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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 DELTA 1 DEB, 21550 on other resources

View DELTA 1 DEB, 21550 on Heavens-Above

View DELTA 1 DEB, 21550 on Keep Track

View DELTA 1 DEB, 21550 on Celestrak

View DELTA 1 DEB, 21550 on Gunter's Space Page

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

DELTA 1 DEB, 21550

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 1 day ago

TLE from 1 day ago

TLE epoch observation values (Epoch: 2026-03-05T16:36:45.310Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #52 in the year 1975 (1975-06-12 UTC)

DELTA 1 DEB Visibility forecast

Co-orbital & Co-planar RSOs

Check out DELTA 1 DEB, 21550 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 1 day ago