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: 4 days ago

TLE from 4 days ago

0 DELTA 1 DEB
1 21439U 75052DX  26028.76117480  .00008971  00000-0  12712-1 0  9999
2 21439 100.0010  36.3985 0339435  28.4592 333.4616 13.35775922594215

Epoch: 2026-01-28T18:16Z

TLE epoch observation values (Epoch: 2026-01-28T18:16:05.502Z)

Latitude

-0.00002°

Longitude

-5.64801°

Altitude

901.73 km

Speed

7.512 km/s

True Right ascension

02h 25m 35s

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

15:16:08

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,376.981 km

Perigee altitude

867.793 km

Semi-major axis

7,500.524 km

Eccentricity

0.03394

Inclination

100.001°

RAAN

36.3985°

Arg. of periapsis

28.4592°

True anomaly

331.65556°

Mean anomaly

333.4616°

Eccentric anomaly

332.56556°

Mean motion

3.34123 °/min

Orbital period

107.74 mins

BSTAR

0.012712

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

DELTA 1 DEB, 21321 (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.
12 mins	2026-02-01 14:29:32.217Z	355.185° N	2026-02-01 14:35:32.217Z	293.581° NW	28.634°	2026-02-01 14:41:32.217Z	237.936° WSW
7 mins	2026-02-01 23:05:32.217Z	101.891° ESE	2026-02-01 23:08:32.217Z	61.396° ENE	21.804°	2026-02-01 23:12:32.217Z	13.495° NNE
9 mins	2026-02-02 00:50:32.217Z	192.962° SSW	2026-02-02 00:54:32.217Z	261.546° W	35.535°	2026-02-02 00:59:32.217Z	331.101° NNW
10 mins	2026-02-02 12:07:32.217Z	49.015° ENE	2026-02-02 12:11:32.217Z	90.77° ESE	25.207°	2026-02-02 12:17:32.217Z	148.344° SSE

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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: 4 days ago

TLE from 4 days ago

TLE epoch observation values (Epoch: 2026-01-28T18:16:05.502Z)

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: 4 days ago