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: 9 hours ago

TLE from 9 hours ago

0 DELTA 1 DEB
1 12539U 76077DU  26119.01570541  .00005794  00000-0  19368-1 0  9992
2 12539 101.7108  33.5027 0375550  31.0222 346.3384 12.78963981123208

Epoch: 2026-04-29T00:22Z

TLE epoch observation values (Epoch: 2026-04-29T00:22:36.947Z)

Latitude

15.93197°

Longitude

167.49133°

Altitude

1,066.335 km

Speed

7.452 km/s

True Right ascension

02h 00m 30s

True Declination

15° 50' 43"

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

16:44:47

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,633.112 km

Perigee altitude

1,053.167 km

Semi-major axis

7,721.277 km

Eccentricity

0.03756

Inclination

101.7108°

RAAN

33.5027°

Arg. of periapsis

31.0222°

True anomaly

345.27355°

Mean anomaly

346.3384°

Eccentric anomaly

345.81096°

Mean motion

3.19897 °/min

Orbital period

112.54 mins

BSTAR

0.019368

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

DELTA 1 DEB, 10705 (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.
11 mins	2026-04-29 17:18:51.975Z	133.076° SE	2026-04-29 17:24:51.975Z	52.222° ENE	34.89°	2026-04-29 17:29:51.975Z	356.816° N
8 mins	2026-04-29 19:11:51.975Z	218.641° SW	2026-04-29 19:14:51.975Z	255.959° W	24.726°	2026-04-29 19:19:51.975Z	314.825° NW
14 mins	2026-04-30 06:55:51.975Z	26.171° NE	2026-04-30 07:01:51.975Z	95.599° ESE	42.385°	2026-04-30 07:09:51.975Z	185.819° SSW
11 mins	2026-04-30 08:47:51.975Z	345.172° N	2026-04-30 08:51:51.975Z	305.052° NW	25.988°	2026-04-30 08:58:51.975Z	247.097° WSW

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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: 9 hours ago

TLE from 9 hours ago

TLE epoch observation values (Epoch: 2026-04-29T00:22:36.947Z)

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: 9 hours ago