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.

Loading next visibility...

Iframe embed code

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

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

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: 3 days ago

TLE from 3 days ago

0 DELTA 1 DEB
1 21439U 75052DX  26169.94709808  .00003708  00000-0  50653-2 0  9996
2 21439  99.9974 175.1500 0349977  50.9156 312.2555 13.37105888613076

Epoch: 2026-06-18T22:43Z

TLE epoch observation values (Epoch: 2026-06-18T22:43:49.274Z)

Latitude

0.00001°

Longitude

-72.98843°

Altitude

951.558 km

Speed

7.46 km/s

True Right ascension

11h 40m 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

09:17:00

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,379.735 km

Perigee altitude

855.082 km

Semi-major axis

7,495.546 km

Eccentricity

0.035

Inclination

99.9974°

RAAN

175.15°

Arg. of periapsis

50.9156°

True anomaly

309.19876°

Mean anomaly

312.2555°

Eccentric anomaly

310.7361°

Mean motion

3.34455 °/min

Orbital period

107.64 mins

BSTAR

0.0050653

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

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

DELTA 1 DEB, 35533 (Decayed)

DELTA 1 DEB, 21681 (Decayed)

Did you know?

You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

Click here to try in Sandbox

DELTA 1 DEB Visibility forecast

Loading observer location...
Set Observer location

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.
6 mins	2026-06-21 22:43:59.807Z	92.734° ESE	2026-06-21 22:46:59.807Z	58.563° ENE	14.958°	2026-06-21 22:49:59.807Z	24.417° NE
9 mins	2026-06-22 00:28:59.807Z	177.015° S	2026-06-22 00:32:59.807Z	285.822° WNW	42.323°	2026-06-22 00:37:59.807Z	339.769° N
7 mins	2026-06-22 11:45:59.807Z	66.896° ENE	2026-06-22 11:48:59.807Z	97.209° ESE	16.762°	2026-06-22 11:52:59.807Z	131.822° SE
12 mins	2026-06-22 13:29:59.807Z	11.425° NNE	2026-06-22 13:34:59.807Z	303.658° NW	44.43°	2026-06-22 13:41:59.807Z	202.632° SW
4 mins	2026-06-22 15:18:59.807Z	317.38° NNW	2026-06-22 15:19:59.807Z	307.586° NW	13.658°	2026-06-22 15:22:59.807Z	279.829° WNW

Items per page:

1–5 of 5 items

of 1 page

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

Please sign-in to view Co-orbital & Co-planar RSOs.

Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in descending order

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in descending order

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: 2026-06-18T22:43:49.274Z)

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