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 (49 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)

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Last TLE update: 23 hours ago

TLE from 23 hours ago

0 DELTA 1 DEB
1 12539U 76077DU  25288.63583759 -.00000955  00000-0 -30800-2 0  9992
2 12539 101.7008 191.2011 0365176  60.0455 338.6591 12.78600571 98236

Epoch: 2025-10-15T15:15Z

TLE epoch observation values (Epoch: 2025-10-15T15:15:36.367Z)

Latitude

36.29338°

Longitude

-70.81041°

Altitude

1,090.398 km

Speed

7.433 km/s

True Right ascension

12h 09m 59s

True Declination

36° 08' 12"

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

09:11:26

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,626.619 km

Perigee altitude

1,062.587 km

Semi-major axis

7,722.74 km

Eccentricity

0.03652

Inclination

101.7008°

RAAN

191.2011°

Arg. of periapsis

60.0455°

True anomaly

337.06896°

Mean anomaly

338.6591°

Eccentric anomaly

337.87094°

Mean motion

3.19806 °/min

Orbital period

112.57 mins

BSTAR

-0.00308

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

DELTA 1 DEB, 40770

DELTA 1 DEB, 10651 (Decayed)

DELTA 1 DEB, 10645

DELTA 1 DEB, 12647

DELTA 1 DEB, 12581

DELTA 1 DEB, 19858 (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.
7 mins	2025-10-16 15:40:28.018Z	89.289° E	2025-10-16 15:44:28.018Z	49.49° ENE	15.995°	2025-10-16 15:47:28.018Z	20.083° NNE
11 mins	2025-10-16 17:28:28.018Z	164.966° S	2025-10-16 17:34:28.018Z	308.846° NW	44.192°	2025-10-16 17:39:28.018Z	340.371° N
11 mins	2025-10-17 05:15:28.018Z	49.857° ENE	2025-10-17 05:20:28.018Z	97.439° ESE	22.452°	2025-10-17 05:26:28.018Z	147.596° SSE
13 mins	2025-10-17 07:05:28.018Z	9.313° NNE	2025-10-17 07:11:28.018Z	287.956° WNW	42.299°	2025-10-17 07:18:28.018Z	213.342° SW
4 mins	2025-10-17 08:59:28.018Z	321.767° NNW	2025-10-17 09:00:28.018Z	313.147° NW	12.31°	2025-10-17 09:03:28.018Z	288.503° WNW

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: 23 hours ago

TLE from 23 hours ago

TLE epoch observation values (Epoch: 2025-10-15T15:15:36.367Z)

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: 23 hours ago