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

Medium (>0.1 m² and <1 m²)

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

TLE from 1 week ago

0 DELTA 1 DEB
1 21439U 75052DX  26233.75920160  .00003894  00000-0  55418-2 0  9993
2 21439 100.0077 237.9535 0324557 255.7138 100.7749 13.37623547621601

Epoch: 2026-08-21T18:13Z

TLE epoch observation values (Epoch: 2026-08-21T18:13:15.018Z)

Latitude

0.00004°

Longitude

-5.43844°

Altitude

1,173.945 km

Speed

7.241 km/s

True Right ascension

15h 51m 48s

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

06:44:45

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,358.685 km

Perigee altitude

872.264 km

Semi-major axis

7,493.611 km

Eccentricity

0.03246

Inclination

100.0077°

RAAN

237.9535°

Arg. of periapsis

255.7138°

True anomaly

104.39855°

Mean anomaly

100.7749°

Eccentric anomaly

102.58976°

Mean motion

3.34585 °/min

Orbital period

107.6 mins

BSTAR

0.0055418

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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.
13 mins	2026-08-30 23:08:55.674Z	124.327° SE	2026-08-30 23:14:55.674Z	68.886° E	31.61°	2026-08-30 23:21:55.674Z	1.361° NNE
13 mins	2026-08-31 00:54:55.674Z	191.441° SSW	2026-08-31 01:00:55.674Z	259.11° W	37.209°	2026-08-31 01:07:55.674Z	332.149° NNW
9 mins	2026-08-31 12:14:55.674Z	44.529° NE	2026-08-31 12:18:55.674Z	88.507° E	26.239°	2026-08-31 12:23:55.674Z	148.021° SSE
11 mins	2026-08-31 13:59:55.674Z	1.431° NNE	2026-08-31 14:05:55.674Z	284.271° WNW	36.507°	2026-08-31 14:10:55.674Z	224.612° SW

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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: 1 week ago

TLE from 1 week ago

TLE epoch observation values (Epoch: 2026-08-21T18:13:15.018Z)

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: 1 week ago