SL-3 R/B, 12904

Orbit data source: Space-Track

SL-3 R/B, 12904 is space debris in LEO originally from a launch on Tue, 13 Oct 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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https://www.satcat.com/sats-embedded/12904?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

12904, 1981-103B

Orbit

LEO

Last TLE update

10 hours ago

Origin

Russian Strategic Rocket Forces (CIS)

Manufacturer

Progress

Mission

Spacecraft

Bus & Motor

BLOK-E, Unknown motor

Mass

1,440 kg wet, 1,440 kg dry

Launch date (UTC)

1981-10-13 (44 years ago)

Launch vehicle

Unknown

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 1.9 m

Radar Cross Section

10.414 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 10 hours ago

0 SL-3 R/B
1 12904U 81103B   25197.86501404  .00002924  00000-0  14063-3 0  9995
2 12904  81.1612 129.3943 0018526  20.0526 340.1427 15.18337194937412

Epoch: 2025-07-16T20:45Z

TLE epoch observation values (Epoch: 2025-07-16T20:45:37.213Z)

Latitude

-0.00004°

Longitude

-116.94981°

Altitude

501.905 km

Speed

7.62 km/s

True Right ascension

08h 37m 34s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

29.73746°

Longitude

-112.3495°

Altitude

502.145 km

Speed

7.623 km/s

Apparent Right ascension

08h 05m 32s

Apparent Declination

-3° 40' 03"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

19:03:44

Azimuth

334.923° NNW

Elevation

-51.151°

Doppler factor

Orbital elements

Apogee altitude

520.658 km

Perigee altitude

495.144 km

Semi-major axis

6,886.038 km

Eccentricity

0.00185

Inclination

81.1612°

RAAN

129.3943°

Arg. of periapsis

20.0526°

True anomaly

Unknown

Mean anomaly

340.1427°

Eccentric anomaly

Unknown

Mean motion

3.7983 °/min

Orbital period

94.78 mins

BSTAR

0.00014063

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Other satellites on launch #103 in the year 1981 (1981-10-13 UTC)

COSMOS 1315, 12903 (Decayed)

SL-3 R/B Visibility forecast

Observer location: undefined°, undefined°

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.
5 mins	2025-07-17 06:48:52.733Z	19.121° NNE	2025-07-17 06:50:52.733Z	59.907° ENE	27.496°	2025-07-17 06:53:52.733Z	133.109° SE
5 mins	2025-07-17 20:37:52.733Z	218.263° SW	2025-07-17 20:39:52.733Z	281.667° WNW	36.077°	2025-07-17 20:42:52.733Z	354.102° N

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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Authenticating...

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Check out SL-3 R/B, 12904 on other resources

View SL-3 R/B, 12904 on Heavens-Above

View SL-3 R/B, 12904 on Keep Track

View SL-3 R/B, 12904 on Celestrak

View SL-3 R/B, 12904 on Gunter's Space Page

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