SL-12 R/B(2), 21221

Orbit data source: Space-Track

SL-12 R/B(2), 21221 is space debris in MEO originally from a launch on Thu, 04 Apr 1991 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/21221?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21221, 1991-025E

Orbit

MEO

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)

1991-04-04 (35 years ago)

Launch vehicle

Unknown

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 3.1 m

Radar Cross Section

23.597 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 2 days ago

TLE from 2 days ago

0 SL-12 R/B(2)
1 21221U 91025E   26171.26818450 -.00000061  00000-0  00000+0 0  9993
2 21221  64.3435 303.8864 0015564 212.2841 198.7028  2.13167967274109

Epoch: 2026-06-20T06:26Z

TLE epoch observation values (Epoch: 2026-06-20T06:26:11.140Z)

Latitude

44.4769°

Longitude

-33.08197°

Altitude

19,167.532 km

Speed

3.948 km/s

True Right ascension

22h 07m 47s

True Declination

44° 25' 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

23:09:03

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

19,163.954 km

Perigee altitude

19,084.571 km

Semi-major axis

25,502.399 km

Eccentricity

0.00156

Inclination

64.3435°

RAAN

303.8864°

Arg. of periapsis

212.2841°

True anomaly

198.64572°

Mean anomaly

198.7028°

Eccentric anomaly

198.67425°

Mean motion

0.53293 °/min

Orbital period

675.51 mins

BSTAR

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Computing Atmospheric mass density...

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Other satellites on launch #25 in the year 1991 (1991-04-04 UTC)

SL-12 DEB, 34804 (Decayed)

SL-12 DEB, 34805 (Decayed)

SL-12 DEB, 34801

SL-12 DEB, 35056

SL-12 DEB, 35313 (Decayed)

SL-12 DEB *, 35314

SL-12 DEB, 34666 (Decayed)

SL-12 DEB, 47344 (Decayed)

SL-12 DEB, 34935 (Decayed)

SL-12 DEB, 35309 (Decayed)

COSMOS 2141 (GLONASS), 21218

SL-12 DEB, 34660 (Decayed)

SL-12 DEB, 34798 (Decayed)

SL-12 DEB, 35057 (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.
368 mins	2026-06-22 13:11:46.628Z	250.297° W	2026-06-22 16:39:46.628Z	34.031° NE	41.243°	2026-06-22 19:19:46.628Z	141.608° SSE
60 mins	2026-06-23 11:06:46.628Z	219.81° SW	2026-06-23 12:06:46.628Z	242.214° WSW	30.253°	2026-06-23 12:06:46.628Z	242.214° WSW

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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), 21221 on other resources

View SL-12 R/B(2), 21221 on Heavens-Above

View SL-12 R/B(2), 21221 on Keep Track

View SL-12 R/B(2), 21221 on Celestrak

View SL-12 R/B(2), 21221 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), 21221

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 days ago

TLE from 2 days ago

TLE epoch observation values (Epoch: 2026-06-20T06:26:11.140Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #25 in the year 1991 (1991-04-04 UTC)

SL-12 R/B(2) Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-12 R/B(2), 21221 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 days ago