SL-6 R/B(2), 12384

Orbit data source: Space-Track

SL-6 R/B(2), 12384 is space debris in HEO originally from a launch on Tue, 31 Mar 1981 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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Identifier

12384, 1981-031D

Orbit

HEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

NPO Energiya

Mission

Spacecraft

Bus & Motor

BLOK-L, Unknown motor

Mass

~900 kg wet, ~900 kg dry

Launch date (UTC)

1981-03-31 (45 years ago)

Launch vehicle

Unknown

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

CYL, 1.1 m

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 15 hours ago

TLE from 15 hours ago

0 SL-6 R/B(2)
1 12384U 81031D   26259.91305036 -.00000563  00000-0  00000-0 0  9997
2 12384  68.1416  63.5507 6067825 356.6847   0.5546  2.03542114337987

Epoch: 2026-09-16T21:54Z

TLE epoch observation values (Epoch: 2026-09-16T21:54:47.551Z)

Latitude

-0.00015°

Longitude

98.98681°

Altitude

3,974.1 km

Speed

7.865 km/s

True Right ascension

04h 14m 10s

True Declination

0° 00' 01"

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

05:14:58

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,879.668 km

Perigee altitude

3,963.343 km

Semi-major axis

26,299.642 km

Eccentricity

0.60678

Inclination

68.1416°

RAAN

63.5507°

Arg. of periapsis

356.6847°

True anomaly

2.85019°

Mean anomaly

0.5546°

Eccentric anomaly

1.4102°

Mean motion

0.50888 °/min

Orbital period

707.43 mins

BSTAR

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Other satellites on launch #31 in the year 1981 (1981-03-31 UTC)

COSMOS 1261 DEB, 35507

COSMOS 1261 DEB, 12892

COSMOS 1261 DEB, 12894

SL-6 R/B(1), 12377 (Decayed)

COSMOS 1261 DEB, 12893

COSMOS 1261 DEB, 27796

COSMOS 1261, 12376

COSMOS 1261 DEB, 33520

COSMOS 1261 DEB, 27901 (Decayed)

COSMOS 1261 DEB, 48264 (Decayed)

COSMOS 1261 DEB, 27902 (Decayed)

COSMOS 1261 DEB, 29202 (Decayed)

SL-6 PLAT, 12378 (Decayed)

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SL-6 R/B(2) 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.
334 mins	2026-09-17 22:12:37.631Z	331.124° NNW	2026-09-17 23:41:37.631Z	287.324° WNW	65.445°	2026-09-18 03:46:37.631Z	253.018° W
43 mins	2026-09-18 09:22:37.631Z	120.388° SE	2026-09-18 09:36:37.631Z	71.144° E	25.04°	2026-09-18 10:05:37.631Z	25.738° NE

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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 SL-6 R/B(2), 12384 on other resources

View SL-6 R/B(2), 12384 on Heavens-Above

View SL-6 R/B(2), 12384 on Keep Track

View SL-6 R/B(2), 12384 on Celestrak

View SL-6 R/B(2), 12384 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-6 R/B(2), 12384

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2026-09-16T21:54:47.551Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #31 in the year 1981 (1981-03-31 UTC)

SL-6 R/B(2) Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-6 R/B(2), 12384 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago