SL-12 R/B(2), 18634

Orbit data source: Space-Track

SL-12 R/B(2), 18634 is space debris in GEO originally from a launch on Thu, 10 Dec 1987 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/18634?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

18634, 1987-100D

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)

1987-12-10 (39 years ago)

Launch vehicle

Unknown

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 3.6 m

Radar Cross Section

23.597 m², Large (>1 m²)

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Last TLE update: 10 hours ago

TLE from 10 hours ago

0 SL-12 R/B(2)
1 18634U 87100D   26271.64171771 -.00000150  00000-0  00000-0 0  9997
2 18634   9.5689 318.9053 0017734 274.0561 251.6952  1.03402265146540

Epoch: 2026-09-28T15:24Z

TLE epoch observation values (Epoch: 2026-09-28T15:24:04.410Z)

Latitude

2.3646°

Longitude

-113.78268°

Altitude

34,953.246 km

Speed

3.105 km/s

True Right ascension

08h 18m 36s

True Declination

2° 21' 44"

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

19:16:33

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,005.531 km

Perigee altitude

34,859.011 km

Semi-major axis

41,310.408 km

Eccentricity

0.00177

Inclination

9.5689°

RAAN

318.9053°

Arg. of periapsis

274.0561°

True anomaly

251.5024°

Mean anomaly

251.6952°

Eccentric anomaly

251.59879°

Mean motion

0.2585 °/min

Orbital period

1,392.67 mins

BSTAR

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Other satellites on launch #100 in the year 1987 (1987-12-10 UTC)

SL-12 DEB *, 21620 (Decayed)

SL-12 PLAT, 18633 (Decayed)

SL-12 R/B(AUX MOTOR), 18635 (Decayed)

RADUGA 21, 18631

SL-12 R/B(AUX MOTOR), 18636 (Decayed)

SL-12 R/B(1), 18632 (Decayed)

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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.
1440 mins	2026-09-29 01:45:38.987Z	184.601° SSW	2026-09-29 09:44:38.987Z	180.072° SSW	54.538°	2026-09-30 01:45:38.987Z	168.568° S

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18634 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), 18634 on other resources

View SL-12 R/B(2), 18634 on Heavens-Above

View SL-12 R/B(2), 18634 on Keep Track

View SL-12 R/B(2), 18634 on Celestrak

View SL-12 R/B(2), 18634 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), 18634

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 10 hours ago

TLE from 10 hours ago

TLE epoch observation values (Epoch: 2026-09-28T15:24:04.410Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #100 in the year 1987 (1987-12-10 UTC)

SL-12 R/B(2) Visibility forecast

18634 neighbors

Co-orbital & Co-planar RSOs

Check out SL-12 R/B(2), 18634 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 10 hours ago