SL-12 R/B(2), 15581

Orbit data source: Space-Track

SL-12 R/B(2), 15581 is space debris in GEO originally from a launch on Thu, 21 Feb 1985 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/15581?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

15581, 1985-016F

Orbit

GEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

NPO Energiya

Mission

Spacecraft

Bus & Motor

BLOK DM, Unknown motor

Mass

2,440 kg wet, 2,440 kg dry

Launch date (UTC)

1985-02-21 (41 years ago)

Launch vehicle

Unknown

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Large (>1 m²)

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Last TLE update: 3 days ago

TLE from 3 days ago

0 SL-12 R/B(2)
1 15581U 85016F   25357.75304856 -.00000247  00000-0  00000-0 0  9994
2 15581   9.9573 317.4152 0026074 255.0502 109.9197  0.99407692120191

Epoch: 2025-12-23T18:04Z

TLE epoch observation values (Epoch: 2025-12-23T18:04:23.395Z)

Latitude

0.8942°

Longitude

-41.07563°

Altitude

36,067.325 km

Speed

3.063 km/s

True Right ascension

21h 30m 12s

True Declination

0° 53' 36"

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

06:11:16

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

36,142.182 km

Perigee altitude

35,921.023 km

Semi-major axis

42,409.74 km

Eccentricity

0.00261

Inclination

9.9573°

RAAN

317.4152°

Arg. of periapsis

255.0502°

True anomaly

110.2003°

Mean anomaly

109.9197°

Eccentric anomaly

110.06003°

Mean motion

0.24851 °/min

Orbital period

1,448.63 mins

BSTAR

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Other satellites on launch #16 in the year 1985 (1985-02-21 UTC)

SL-12 R/B(AUX MOTOR), 15577 (Decayed)

SL-12 R/B(1), 15575 (Decayed)

SL-12 R/B(AUX MOTOR), 15578 (Decayed)

SL-12 PLAT, 15576 (Decayed)

COSMOS 1629, 15574

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SL-12 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.
287 mins	2025-12-26 06:51:37.960Z	115.226° SE	2025-12-26 06:51:37.960Z	115.226° SE	15.455°	2025-12-26 11:38:37.960Z	121.264° SE
1068 mins	2025-12-26 13:03:37.960Z	120.931° SE	2025-12-27 00:12:37.960Z	106.956° ESE	23.867°	2025-12-27 06:51:37.960Z	117.436° SE

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15581 neighbors

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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-12 R/B(2), 15581 on other resources

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View SL-12 R/B(2), 15581 on Keep Track

View SL-12 R/B(2), 15581 on Celestrak

View SL-12 R/B(2), 15581 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-12 R/B(2), 15581

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 3 days ago

TLE from 3 days ago

TLE epoch observation values (Epoch: 2025-12-23T18:04:23.395Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #16 in the year 1985 (1985-02-21 UTC)

SL-12 R/B(2) Visibility forecast

15581 neighbors

Co-orbital & Co-planar RSOs

Check out SL-12 R/B(2), 15581 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 3 days ago