DELTA 1 DEB, 21550

Orbit data source: Space-Track

DELTA 1 DEB, 21550 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/21550?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/21550?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

21550, 1975-052HE

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: 7 hours ago

TLE from 7 hours ago

0 DELTA 1 DEB
1 21550U 75052HE  26127.18695455  .00000438  00000-0  18972-2 0  9997
2 21550  99.8527  29.8901 0547452  83.9682  68.5160 12.46050329587353

Epoch: 2026-05-07T04:29Z

TLE epoch observation values (Epoch: 2026-05-07T04:29:12.873Z)

Latitude

21.2165°

Longitude

-78.6036°

Altitude

1,346.812 km

Speed

7.249 km/s

True Right ascension

14h 14m 56s

True Declination

21° 06' 34"

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

19:09:20

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,908.61 km

Perigee altitude

1,048.384 km

Semi-major axis

7,856.634 km

Eccentricity

0.05475

Inclination

99.8527°

RAAN

29.8901°

Arg. of periapsis

83.9682°

True anomaly

74.49248°

Mean anomaly

68.516°

Eccentric anomaly

71.49041°

Mean motion

3.11665 °/min

Orbital period

115.51 mins

BSTAR

0.0018972

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

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

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.
5 mins	2026-05-07 15:28:34.374Z	78.338° E	2026-05-07 15:30:34.374Z	59.858° ENE	13.594°	2026-05-07 15:33:34.374Z	31.02° NE
11 mins	2026-05-07 17:18:34.374Z	161.589° S	2026-05-07 17:23:34.374Z	146.544° SSE	44.629°	2026-05-07 17:29:34.374Z	345.872° N
4 mins	2026-05-07 19:16:34.374Z	252.146° W	2026-05-07 19:18:34.374Z	270.115° WNW	12.759°	2026-05-07 19:20:34.374Z	288.468° WNW
11 mins	2026-05-08 05:22:34.374Z	43.553° NE	2026-05-08 05:27:34.374Z	103.138° ESE	28.568°	2026-05-08 05:33:34.374Z	157.653° S
11 mins	2026-05-08 07:16:34.374Z	353.648° N	2026-05-08 07:21:34.374Z	282.353° WNW	34.421°	2026-05-08 07:27:34.374Z	226.065° WSW

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, 21550 on other resources

View DELTA 1 DEB, 21550 on Heavens-Above

View DELTA 1 DEB, 21550 on Keep Track

View DELTA 1 DEB, 21550 on Celestrak

View DELTA 1 DEB, 21550 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, 21550

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 7 hours ago

TLE from 7 hours ago

TLE epoch observation values (Epoch: 2026-05-07T04:29:12.873Z)

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, 21550 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 7 hours ago