DELTA 1 DEB, 21439

Orbit data source: Space-Track

DELTA 1 DEB, 21439 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 URL

https://www.satcat.com/sats-embedded/21439?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21439, 1975-052DX

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)

Expand to show TLE details & history
Last TLE update: 3 days ago

TLE from 3 days ago

0 DELTA 1 DEB
1 21439U 75052DX  26121.75137633  .00004811  00000-0  66674-2 0  9990
2 21439 100.0000 127.7626 0344871 163.8228 197.4242 13.36708446606632

Epoch: 2026-05-01T18:01Z

TLE epoch observation values (Epoch: 2026-05-01T18:01:58.914Z)

Latitude

-0.00002°

Longitude

-2.41201°

Altitude

1,371.91 km

Speed

7.054 km/s

True Right ascension

08h 31m 03s

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

10:37:54

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,377.447 km

Perigee altitude

860.345 km

Semi-major axis

7,497.033 km

Eccentricity

0.03449

Inclination

100°

RAAN

127.7626°

Arg. of periapsis

163.8228°

True anomaly

196.28771°

Mean anomaly

197.4242°

Eccentric anomaly

196.85139°

Mean motion

3.34356 °/min

Orbital period

107.67 mins

BSTAR

0.0066674

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

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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.
9 mins	2026-05-05 12:28:23.889Z	36.424° NE	2026-05-05 12:33:23.889Z	101.554° ESE	26.999°	2026-05-05 12:37:23.889Z	155.203° SSE
7 mins	2026-05-05 14:16:23.889Z	343.17° N	2026-05-05 14:19:23.889Z	294.881° NW	28.198°	2026-05-05 14:23:23.889Z	238.148° WSW
9 mins	2026-05-05 22:48:23.889Z	101.321° ESE	2026-05-05 22:52:23.889Z	61.143° ENE	22.354°	2026-05-05 22:57:23.889Z	12.206° NNE
13 mins	2026-05-06 00:31:23.889Z	174.764° S	2026-05-06 00:38:23.889Z	275.624° WNW	42.668°	2026-05-06 00:44:23.889Z	338.68° N

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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, 21439 on other resources

View DELTA 1 DEB, 21439 on Heavens-Above

View DELTA 1 DEB, 21439 on Keep Track

View DELTA 1 DEB, 21439 on Celestrak

View DELTA 1 DEB, 21439 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, 21439

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 3 days ago

TLE from 3 days ago

TLE epoch observation values (Epoch: 2026-05-01T18:01:58.914Z)

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, 21439 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 3 days ago