SL-6 R/B(2), 20599

Orbit data source: Space-Track

SL-6 R/B(2), 20599 is space debris in HEO originally from a launch on Sat, 28 Apr 1990 UTC launched from the Plesetsk Missile And Space Complex (PKMTR). 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/20599?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

20599, 1990-040D

Orbit

HEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

NPO Energiya

Mission

Spacecraft

Bus & Motor

BLOK-L, Unknown motor

Mass

900 kg wet, 900 kg dry

Launch date (UTC)

1990-04-28 (36 years ago)

Launch vehicle

Unknown

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 1.6 m

Radar Cross Section

8.039 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 1 day ago

TLE from 1 day ago

0 SL-6 R/B(2)
1 20599U 90040D   26154.37770824 -.00000565  00000-0  00000-0 0  9991
2 20599  69.7503 130.0243 5629390  39.8374 350.0743  2.03488604268281

Epoch: 2026-06-03T09:03Z

TLE epoch observation values (Epoch: 2026-06-03T09:03:53.991Z)

Latitude

0.00014°

Longitude

102.18838°

Altitude

6,171.453 km

Speed

6.955 km/s

True Right ascension

08h 40m 00s

True Declination

0° 00' 00"

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

19:55:05

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

34,733.843 km

Perigee altitude

5,118.436 km

Semi-major axis

26,304.277 km

Eccentricity

0.56294

Inclination

69.7503°

RAAN

130.0243°

Arg. of periapsis

39.8374°

True anomaly

319.60522°

Mean anomaly

350.0743°

Eccentric anomaly

337.9827°

Mean motion

0.50875 °/min

Orbital period

707.62 mins

BSTAR

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Other satellites on launch #40 in the year 1990 (1990-04-28 UTC)

SL-6 R/B(1), 20597 (Decayed)

SL-6 PLAT, 20598 (Decayed)

SL-6 DEB, 20600 (Decayed)

COSMOS 2076, 20596

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SL-6 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.
210 mins	2026-06-04 10:04:06.508Z	272.089° WNW	2026-06-04 10:06:06.508Z	256.526° W	44.745°	2026-06-04 13:34:06.508Z	210.679° SW
32 mins	2026-06-04 20:30:06.508Z	126.63° SE	2026-06-04 20:45:06.508Z	83.183° E	21.672°	2026-06-04 21:02:06.508Z	34.277° NE
68 mins	2026-06-05 08:56:06.508Z	332.525° NNW	2026-06-05 09:40:06.508Z	249.747° W	44.985°	2026-06-05 10:04:06.508Z	179.667° S

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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-6 R/B(2), 20599 on other resources

View SL-6 R/B(2), 20599 on Heavens-Above

View SL-6 R/B(2), 20599 on Keep Track

View SL-6 R/B(2), 20599 on Celestrak

View SL-6 R/B(2), 20599 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-6 R/B(2), 20599

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 1 day ago

TLE from 1 day ago

TLE epoch observation values (Epoch: 2026-06-03T09:03:53.991Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #40 in the year 1990 (1990-04-28 UTC)

SL-6 R/B(2) Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-6 R/B(2), 20599 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 1 day ago