DELTA 1 DEB, 21504

Orbit data source: Space-Track

DELTA 1 DEB, 21504 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/21504?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/21504?theme=dark&initialShowStats=false

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Identifier

21504, 1975-052FZ

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: 2 weeks ago

TLE from 2 weeks ago

0 DELTA 1 DEB
1 21504U 75052FZ  25331.36371444 -.00000301  00000-0 -10399-2 0  9997
2 21504  99.8149 290.5516 0544731 225.1419 296.5854 12.48541074569825

Epoch: 2025-11-27T08:43Z

TLE epoch observation values (Epoch: 2025-11-27T08:43:44.927Z)

Latitude

23.66923°

Longitude

-82.58027°

Altitude

1,301.172 km

Speed

7.286 km/s

True Right ascension

07h 39m 30s

True Declination

23° 33' 07"

Sunlit

Object was in full shadow 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

08:40:52

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,895.441 km

Perigee altitude

1,040.631 km

Semi-major axis

7,846.173 km

Eccentricity

0.05447

Inclination

99.8149°

RAAN

290.5516°

Arg. of periapsis

225.1419°

True anomaly

290.8377°

Mean anomaly

296.5854°

Eccentric anomaly

293.72816°

Mean motion

3.12289 °/min

Orbital period

115.28 mins

BSTAR

-0.0010399

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

DELTA 1 DEB, 21508 (Decayed)

DELTA 1 DEB, 21518 (Decayed)

DELTA 1 DEB, 21385 (Decayed)

DELTA 1 DEB, 42660 (Decayed)

DELTA 1 DEB, 21335 (Decayed)

DELTA 1 DEB, 21344 (Decayed)

DELTA 1 DEB, 21681 (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.
13 mins	2025-12-11 10:58:48.535Z	3.117° NNE	2025-12-11 11:05:48.535Z	289.767° WNW	35.959°	2025-12-11 11:11:48.535Z	224.597° SW
17 mins	2025-12-11 20:03:48.535Z	129.845° SE	2025-12-11 20:12:48.535Z	60.429° ENE	35.871°	2025-12-11 20:20:48.535Z	358.341° N
18 mins	2025-12-11 21:56:48.535Z	190.122° SSW	2025-12-11 22:05:48.535Z	263.085° W	37.883°	2025-12-11 22:14:48.535Z	334.103° NNW
13 mins	2025-12-12 10:04:48.535Z	17.7° NNE	2025-12-12 10:10:48.535Z	60.445° ENE	44.104°	2025-12-12 10:17:48.535Z	191.4° SSW

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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, 21504 on other resources

View DELTA 1 DEB, 21504 on Heavens-Above

View DELTA 1 DEB, 21504 on Keep Track

View DELTA 1 DEB, 21504 on Celestrak

View DELTA 1 DEB, 21504 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, 21504

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 weeks ago

TLE from 2 weeks ago

TLE epoch observation values (Epoch: 2025-11-27T08:43:44.927Z)

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, 21504 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 weeks ago