SL-12 R/B(2), 25743

Orbit data source: Space-Track

SL-12 R/B(2), 25743 is space debris in HEO originally from a launch on Thu, 20 May 1999 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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Iframe URL

https://www.satcat.com/sats-embedded/25743?theme=dark&initialShowStats=false

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Identifier

25743, 1999-027D

Orbit

HEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

RKKE

Mission

Spacecraft

Bus & Motor

BLOK DM2, Unknown motor

Mass

2,560 kg wet, 2,560 kg dry

Launch date (UTC)

1999-05-20 (27 years ago)

Launch vehicle

Unknown

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl + 1 Nozzle, 3.1 m

Radar Cross Section

23.684 m², Large (>1 m²)

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Last TLE update: 2 days ago

TLE from 2 days ago

0 SL-12 R/B(2)
1 25743U 99027D   26171.45896255 -.00000137  00000-0  00000+0 0  9990
2 25743  16.5924 238.7084 5194343 179.1436  97.0112  1.87832945185935

Epoch: 2026-06-20T11:00Z

TLE epoch observation values (Epoch: 2026-06-20T11:00:54.364Z)

Latitude

-9.51821°

Longitude

130.63765°

Altitude

29,036.762 km

Speed

2.854 km/s

True Right ascension

13h 38m 08s

True Declination

-9° 30' 25"

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

23:09:09

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,785.474 km

Perigee altitude

6,957.343 km

Semi-major axis

27,749.546 km

Eccentricity

0.51943

Inclination

16.5924°

RAAN

238.7084°

Arg. of periapsis

179.1436°

True anomaly

145.50305°

Mean anomaly

97.0112°

Eccentric anomaly

122.19615°

Mean motion

0.46953 °/min

Orbital period

766.73 mins

BSTAR

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Other satellites on launch #27 in the year 1999 (1999-05-20 UTC)

SL-12 PLAT, 25742 (Decayed)

SL-12 R/B(1), 25741 (Decayed)

SL-12 DEB, 44588

NIMIQ 1, 25740

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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.
679 mins	2026-06-23 00:39:52.598Z	209.451° SW	2026-06-23 11:03:52.598Z	190.025° SSW	39.777°	2026-06-23 11:58:52.598Z	115.287° SE

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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), 25743 on other resources

View SL-12 R/B(2), 25743 on Heavens-Above

View SL-12 R/B(2), 25743 on Keep Track

View SL-12 R/B(2), 25743 on Celestrak

View SL-12 R/B(2), 25743 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), 25743

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: 2026-06-20T11:00:54.364Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #27 in the year 1999 (1999-05-20 UTC)

SL-12 R/B(2) Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-12 R/B(2), 25743 on other resources

Documentation

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