DELTA 1 DEB, 13539

Orbit data source: Space-Track

DELTA 1 DEB, 13539 is space debris in LEO 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.

Loading next visibility...

Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/13539?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/13539?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

13539, 1976-077EM

Orbit

LEO

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, 1.1 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 13539U 76077EM  26106.17307270  .00000171  00000-0  31015-2 0  9991
2 13539 101.8770 187.7194 0414430 163.1746 226.2913 11.65458271946530

Epoch: 2026-04-16T04:09Z

TLE epoch observation values (Epoch: 2026-04-16T04:09:13.481Z)

Latitude

25.58082°

Longitude

-84.66304°

Altitude

2,084.45 km

Speed

6.764 km/s

True Right ascension

12h 07m 52s

True Declination

25° 28' 05"

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

19:52:49

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

2,177.438 km

Perigee altitude

1,496.52 km

Semi-major axis

8,215.116 km

Eccentricity

0.04144

Inclination

101.877°

RAAN

187.7194°

Arg. of periapsis

163.1746°

True anomaly

222.97904°

Mean anomaly

226.2913°

Eccentric anomaly

224.62334°

Mean motion

2.91489 °/min

Orbital period

123.5 mins

BSTAR

0.0031015

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

Other satellites on launch #77 in the year 1976 (1976-07-29 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.
13 mins	2026-04-16 17:03:30.018Z	40.214° NE	2026-04-16 17:10:30.018Z	99.376° ESE	26.025°	2026-04-16 17:16:30.018Z	149.862° SSE
15 mins	2026-04-16 19:04:30.018Z	8.153° NNE	2026-04-16 19:11:30.018Z	303.955° NW	40°	2026-04-16 19:19:30.018Z	220.531° SW
4 mins	2026-04-16 21:09:30.018Z	328.52° NNW	2026-04-16 21:10:30.018Z	321.434° NNW	12.155°	2026-04-16 21:13:30.018Z	300.189° NW
12 mins	2026-04-17 02:52:30.018Z	87.412° E	2026-04-17 02:58:30.018Z	50.329° ENE	20.361°	2026-04-17 03:04:30.018Z	10.328° NNE
19 mins	2026-04-17 04:48:30.018Z	151.803° SSE	2026-04-17 04:58:30.018Z	51.354° ENE	44.381°	2026-04-17 05:07:30.018Z	345.54° N
15 mins	2026-04-17 06:52:30.018Z	218.568° SW	2026-04-17 06:59:30.018Z	262.886° W	24.522°	2026-04-17 07:07:30.018Z	316.459° NNW

Items per page:

1–6 of 6 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, 13539 on other resources

View DELTA 1 DEB, 13539 on Heavens-Above

View DELTA 1 DEB, 13539 on Keep Track

View DELTA 1 DEB, 13539 on Celestrak

View DELTA 1 DEB, 13539 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, 13539

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: 2026-04-16T04:09:13.481Z)

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, 13539 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 9 hours ago