DELTA 1 DEB, 12539

Orbit data source: Space-Track

DELTA 1 DEB, 12539 is space debris in SSO originally from a launch on Thu, 29 Jul 1976 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/12539?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

12539, 1976-077DU

Orbit

SSO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

Unknown

Mission

Spacecraft

Bus & Motor

Unknown

Mass

Unknown

Launch date (UTC)

1976-07-29 (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: 20 hours ago

TLE from 20 hours ago

0 DELTA 1 DEB
1 12539U 76077DU  26072.70202603  .00002302  00000-0  80533-2 0  9992
2 12539 101.7037 345.5394 0358464 123.2518 270.1853 12.78490515117283

Epoch: 2026-03-13T16:50Z

TLE epoch observation values (Epoch: 2026-03-13T16:50:55.048Z)

Latitude

28.70993°

Longitude

-85.00617°

Altitude

1,359.866 km

Speed

7.177 km/s

True Right ascension

22h 36m 13s

True Declination

28° 34' 36"

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

17:01:35

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,621.896 km

Perigee altitude

1,068.199 km

Semi-major axis

7,723.184 km

Eccentricity

0.03585

Inclination

101.7037°

RAAN

345.5394°

Arg. of periapsis

123.2518°

True anomaly

266.08055°

Mean anomaly

270.1853°

Eccentric anomaly

268.13254°

Mean motion

3.19778 °/min

Orbital period

112.58 mins

BSTAR

0.0080533

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Other satellites on launch #77 in the year 1976 (1976-07-29 UTC)

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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	2026-03-14 17:13:29.798Z	138.048° SSE	2026-03-14 17:20:29.798Z	57.454° ENE	38.622°	2026-03-14 17:26:29.798Z	353.71° N
11 mins	2026-03-14 19:05:29.798Z	208.392° SW	2026-03-14 19:10:29.798Z	254.61° W	26.72°	2026-03-14 19:16:29.798Z	316.763° NNW
11 mins	2026-03-15 06:52:29.798Z	25.975° NE	2026-03-15 06:57:29.798Z	103.102° ESE	42.346°	2026-03-15 07:03:29.798Z	186.295° SSW
7 mins	2026-03-15 08:44:29.798Z	339.041° N	2026-03-15 08:47:29.798Z	305.989° NW	19.814°	2026-03-15 08:51:29.798Z	263.199° W

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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, 12539 on other resources

View DELTA 1 DEB, 12539 on Heavens-Above

View DELTA 1 DEB, 12539 on Keep Track

View DELTA 1 DEB, 12539 on Celestrak

View DELTA 1 DEB, 12539 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, 12539

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 20 hours ago

TLE from 20 hours ago

TLE epoch observation values (Epoch: 2026-03-13T16:50:55.048Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #77 in the year 1976 (1976-07-29 UTC)

DELTA 1 DEB Visibility forecast

Co-orbital & Co-planar RSOs

Check out DELTA 1 DEB, 12539 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 20 hours ago