SL-8 R/B, 4391

Orbit data source: Space-Track

SL-8 R/B, 4391 is space debris in LEO originally from a launch on Sat, 25 Apr 1970 UTC launched from the Plesetsk Missile And Space Complex (PKMTR). 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/4391?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

4391, 1970-036J

Orbit

LEO

Last TLE update

8 hours ago

Origin

Russian Strategic Rocket Forces (CIS)

Manufacturer

Yuzhnoe

Mission

Spacecraft

Bus & Motor

S3, Unknown motor

Mass

1,434 kg wet, 1,434 kg dry

Launch date (UTC)

1970-04-25 (55 years ago)

Launch vehicle

Unknown

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 2.1 m

Radar Cross Section

10.179 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 8 hours ago

0 SL-8 R/B
1 04391U 70036J   25230.58647233  .00000017  00000-0  25723-3 0  9993
2 04391  74.0291 294.6827 0076566 271.7035 202.1128 12.34978247493677

Epoch: 2025-08-18T14:04Z

TLE epoch observation values (Epoch: 2025-08-18T14:04:31.209Z)

Latitude

61.94541°

Longitude

-95.94319°

Altitude

1,594.352 km

Speed

7.053 km/s

True Right ascension

05h 29m 30s

True Declination

61° 49' 03"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

51.42309°

Longitude

-84.98079°

Altitude

1,585.589 km

Speed

7.058 km/s

Apparent Right ascension

03h 30m 32s

Apparent Declination

15° 59' 07"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

12:44:40

Azimuth

316.612° NNW

Elevation

-22.073°

Doppler factor

Orbital elements

Apogee altitude

1,586.333 km

Perigee altitude

1,465.298 km

Semi-major axis

7,903.952 km

Eccentricity

0.00766

Inclination

74.0291°

RAAN

294.6827°

Arg. of periapsis

271.7035°

True anomaly

201.78543°

Mean anomaly

202.1128°

Eccentric anomaly

201.94883°

Mean motion

3.08871 °/min

Orbital period

116.55 mins

BSTAR

0.00025723

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Other satellites on launch #36 in the year 1970 (1970-04-25 UTC)

SL-8 R/B Visibility forecast

Observer location: undefined°, undefined°
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.
16 mins	2025-08-19 05:06:05.473Z	181.134° SSW	2025-08-19 05:14:05.473Z	88.51° E	42.411°	2025-08-19 05:22:05.473Z	24.897° NE
14 mins	2025-08-19 07:07:05.473Z	252.329° W	2025-08-19 07:13:05.473Z	301.296° NW	26.902°	2025-08-19 07:21:05.473Z	2.831° NNE
10 mins	2025-08-19 13:23:05.473Z	12.616° NNE	2025-08-19 13:28:05.473Z	48.859° ENE	17.47°	2025-08-19 13:33:05.473Z	83.783° E
16 mins	2025-08-19 15:21:05.473Z	345.526° N	2025-08-19 15:28:05.473Z	43.66° NE	43.785°	2025-08-19 15:37:05.473Z	154.53° SSE
12 mins	2025-08-19 17:21:05.473Z	310.491° NW	2025-08-19 17:26:05.473Z	273.417° WNW	21.768°	2025-08-19 17:33:05.473Z	221.7° SW

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

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 ascending order

Authenticating...

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Check out SL-8 R/B, 4391 on other resources

View SL-8 R/B, 4391 on Heavens-Above

View SL-8 R/B, 4391 on Keep Track

View SL-8 R/B, 4391 on Celestrak

View SL-8 R/B, 4391 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 R/B, 4391

Orbit data source: Space-Track

Expand to show TLE details & history

TLE from 8 hours ago

TLE epoch observation values (Epoch: 2025-08-18T14:04:31.209Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #36 in the year 1970 (1970-04-25 UTC)

SL-8 R/B Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-8 R/B, 4391 on other resources

Documentation