DELTA 1 DEB, 21499

Orbit data source: Space-Track

DELTA 1 DEB, 21499 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/21499?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21499, 1975-052FU

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 (50 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: 10 hours ago

TLE from 10 hours ago

0 DELTA 1 DEB
1 21499U 75052FU  25292.06241784  .00002285  00000-0  40355-2 0  9992
2 21499  99.6357  70.5690 0139545 135.0939 289.7240 13.40012231662160

Epoch: 2025-10-19T01:29Z

TLE epoch observation values (Epoch: 2025-10-19T01:29:52.901Z)

Latitude

61.83065°

Longitude

1.9283°

Altitude

1,085.77 km

Speed

7.332 km/s

True Right ascension

03h 28m 43s

True Declination

61° 41' 37"

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

06:12:33

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,210.989 km

Perigee altitude

1,002.099 km

Semi-major axis

7,484.681 km

Eccentricity

0.01395

Inclination

99.6357°

RAAN

70.569°

Arg. of periapsis

135.0939°

True anomaly

288.21002°

Mean anomaly

289.724°

Eccentric anomaly

288.96788°

Mean motion

3.35184 °/min

Orbital period

107.4 mins

BSTAR

0.0040355

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

DELTA 1 DEB, 21335 (Decayed)

DELTA 1 DEB, 21348 (Decayed)

DELTA 1 DEB, 21381 (Decayed)

DELTA 1 DEB, 21505 (Decayed)

DELTA 1 DEB, 21340 (Decayed)

DELTA 1 DEB, 21685 (Decayed)

DELTA 1 DEB, 21321 (Decayed)

DELTA 1 DEB, 21679 (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.
10 mins	2025-10-19 21:30:16.817Z	34.166° NE	2025-10-19 21:35:16.817Z	96.752° ESE	31.326°	2025-10-19 21:40:16.817Z	161.21° S
9 mins	2025-10-19 23:17:16.817Z	347.76° N	2025-10-19 23:21:16.817Z	293.272° NW	28.801°	2025-10-19 23:26:16.817Z	235.148° WSW
8 mins	2025-10-20 07:49:16.817Z	98.084° ESE	2025-10-20 07:52:16.817Z	66.593° ENE	20.799°	2025-10-20 07:57:16.817Z	14.68° NNE
11 mins	2025-10-20 09:33:16.817Z	178.749° S	2025-10-20 09:38:16.817Z	264.644° W	42.497°	2025-10-20 09:44:16.817Z	338.93° N

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, 21499 on other resources

View DELTA 1 DEB, 21499 on Heavens-Above

View DELTA 1 DEB, 21499 on Keep Track

View DELTA 1 DEB, 21499 on Celestrak

View DELTA 1 DEB, 21499 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, 21499

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 10 hours ago

TLE from 10 hours ago

TLE epoch observation values (Epoch: 2025-10-19T01:29:52.901Z)

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, 21499 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 10 hours ago