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 (42 years ago)

Launch vehicle

Unknown

Launch site

Tyuratam Missile And Space Complex (TTMTR)

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: 16 hours ago

TLE from 16 hours ago

0 SL-12 R/B(2)
1 15581U 85016F   26264.81178295 -.00000051  00000-0  00000-0 0  9998
2 15581   9.4779 315.7219 0026157 259.9413 267.3947  0.99408774122898

Epoch: 2026-09-21T19:28Z

TLE epoch observation values (Epoch: 2026-09-21T19:28:58.046Z)

Latitude

2.11247°

Longitude

-169.99021°

Altitude

36,034.398 km

Speed

3.066 km/s

True Right ascension

08h 11m 45s

True Declination

2° 06' 37"

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

04:40:42

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

36,142.23 km

Perigee altitude

35,920.369 km

Semi-major axis

42,409.436 km

Eccentricity

0.00262

Inclination

9.4779°

RAAN

315.7219°

Arg. of periapsis

259.9413°

True anomaly

267.09532°

Mean anomaly

267.3947°

Eccentric anomaly

267.245°

Mean motion

0.24851 °/min

Orbital period

1,448.62 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), 15578 (Decayed)

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

SL-12 PLAT, 15576 (Decayed)

SL-12 R/B(1), 15575 (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.
468 mins	2026-09-22 11:35:47.532Z	260.419° W	2026-09-22 14:26:47.532Z	262.598° W	15.137°	2026-09-22 19:23:47.532Z	257.519° W
56 mins	2026-09-23 10:39:47.532Z	260.762° W	2026-09-23 11:35:47.532Z	262.347° W	11.046°	2026-09-23 11:35:47.532Z	262.347° W

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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 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: 16 hours ago

TLE from 16 hours ago

TLE epoch observation values (Epoch: 2026-09-21T19:28:58.046Z)

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: 16 hours ago