**SL-8 DEB *, 3931**

Orbit data source: Space-Track

SL-8 DEB *, 3931 is space debris in LEO originally from a launch on Mon, 15 Mar 1965 UTC launched from the Tyuratam Missile And Space Complex (TTMTR). 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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https://www.satcat.com/sats-embedded/3931?theme=dark&initialShowStats=false

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Identifier

3931, 1965-020EV

Orbit

LEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

Unknown

Mission

Spacecraft

Bus & Motor

Unknown

Mass

Unknown

Launch date (UTC)

1965-03-15 (61 years ago)

Launch vehicle

Unknown

Launch site

Tyuratam Missile And Space Complex (TTMTR)

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: 13 hours ago

TLE from 13 hours ago

0 SL-8 DEB *
1  3931U 65020EV  25289.04464293 -.00000056  00000-0  27396-3 0  9999
2  3931  56.0592 143.3085 0193651 123.9547  28.7287 12.35205603746991

Epoch: 2025-10-16T01:04Z

TLE epoch observation values (Epoch: 2025-10-16T01:04:17.149Z)

Latitude

21.54901°

Longitude

-92.90719°

Altitude

1,394.26 km

Speed

7.225 km/s

True Right ascension

20h 31m 53s

True Declination

21° 26' 29"

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

09:08:40

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,679.897 km

Perigee altitude

1,373.737 km

Semi-major axis

7,904.954 km

Eccentricity

0.01937

Inclination

56.0592°

RAAN

143.3085°

Arg. of periapsis

123.9547°

True anomaly

29.81837°

Mean anomaly

28.7287°

Eccentric anomaly

29.2712°

Mean motion

3.08812 °/min

Orbital period

116.58 mins

BSTAR

0.00027396

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Other satellites on launch #20 in the year 1965 (1965-03-15 UTC)

SL-8 DEB, 1498 (Decayed)

SL-8 DEB, 1487 (Decayed)

SL-8 DEB, 2637 (Decayed)

SL-8 DEB, 3708 (Decayed)

SL-8 DEB, 6736 (Decayed)

SL-8 DEB, 2387 (Decayed)

SL-8 DEB, 1601 (Decayed)

SL-8 DEB, 1486 (Decayed)

SL-8 DEB, 1599 (Decayed)

SL-8 DEB, 1338 (Decayed)

SL-8 DEB, 1409 (Decayed)

SL-8 DEB, 1545 (Decayed)

SL-8 DEB, 1337 (Decayed)

SL-8 DEB, 1419 (Decayed)

SL-8 DEB, 1339 (Decayed)

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SL-8 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.
16 mins	2025-10-16 15:53:42.693Z	195.368° SSW	2025-10-16 16:01:42.693Z	129.332° SE	37.508°	2025-10-16 16:09:42.693Z	54.916° ENE
15 mins	2025-10-16 17:56:42.693Z	252.79° W	2025-10-16 18:03:42.693Z	323.556° NNW	38.966°	2025-10-16 18:11:42.693Z	40.609° NE
12 mins	2025-10-16 20:01:42.693Z	301.343° NW	2025-10-16 20:07:42.693Z	353.114° N	25.076°	2025-10-16 20:13:42.693Z	43.847° NE
13 mins	2025-10-16 22:05:42.693Z	322.893° NNW	2025-10-16 22:11:42.693Z	16.599° NNE	28.711°	2025-10-16 22:18:42.693Z	79.815° E
15 mins	2025-10-17 00:07:42.693Z	315.866° NNW	2025-10-17 00:14:42.693Z	22.981° NE	44.785°	2025-10-17 00:22:42.693Z	132.862° SE
11 mins	2025-10-17 02:10:42.693Z	285.753° WNW	2025-10-17 02:15:42.693Z	242.877° WSW	22.606°	2025-10-17 02:21:42.693Z	194.598° SSW

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 SL-8 DEB *, 3931 on other resources

View SL-8 DEB *, 3931 on Heavens-Above

View SL-8 DEB *, 3931 on Keep Track

View SL-8 DEB *, 3931 on Celestrak

View SL-8 DEB *, 3931 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

SL-8 DEB *, 3931

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 13 hours ago

TLE from 13 hours ago

TLE epoch observation values (Epoch: 2025-10-16T01:04:17.149Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #20 in the year 1965 (1965-03-15 UTC)

SL-8 DEB * Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-8 DEB *, 3931 on other resources

Documentation

**SL-8 DEB *, 3931**

Expand to show TLE details & history
Last TLE update: 13 hours ago