SL-8 R/B, 20509

Orbit data source: Space-Track

SL-8 R/B, 20509 is space debris in LEO originally from a launch on Tue, 27 Feb 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 src="https://www.satcat.com/sats-embedded/20509?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/20509?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

20509, 1990-017B

Orbit

LEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

Polyot

Mission

Spacecraft

Bus & Motor

S3, Unknown motor

Mass

1,434 kg wet, 1,434 kg dry

Launch date (UTC)

1990-02-27 (36 years ago)

Launch vehicle

Unknown

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 3.3 m

Radar Cross Section

14.646 m², Large (>1 m²)

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

TLE from 2 days ago

0 SL-8 R/B
1 20509U 90017B   26171.40150520  .00000027  00000-0  12603-4 0  9992
2 20509  82.9533  48.6629 0042354 333.3482  26.5497 13.75897379822371

Epoch: 2026-06-20T09:38Z

TLE epoch observation values (Epoch: 2026-06-20T09:38:10.049Z)

Latitude

-0°

Longitude

-4.49563°

Altitude

953.524 km

Speed

7.389 km/s

True Right ascension

03h 14m 39s

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

23:09:12

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,006.768 km

Perigee altitude

944.475 km

Semi-major axis

7,353.758 km

Eccentricity

0.00424

Inclination

82.9533°

RAAN

48.6629°

Arg. of periapsis

333.3482°

True anomaly

26.76767°

Mean anomaly

26.5497°

Eccentric anomaly

26.65858°

Mean motion

3.44175 °/min

Orbital period

104.6 mins

BSTAR

0.000012603

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Other satellites on launch #17 in the year 1990 (1990-02-27 UTC)

SL-8 DEB, 45523

NADEZHDA 2, 20508

SL-8 DEB, 28706

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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

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SL-8 R/B 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.
10 mins	2026-06-22 15:50:55.442Z	160.699° S	2026-06-22 15:55:55.442Z	90.985° ESE	37.109°	2026-06-22 16:00:55.442Z	21.087° NNE
8 mins	2026-06-22 17:37:55.442Z	244.294° WSW	2026-06-22 17:41:55.442Z	292.659° NW	22.04°	2026-06-22 17:45:55.442Z	336.895° NNW
9 mins	2026-06-23 02:48:55.442Z	17.246° NNE	2026-06-23 02:52:55.442Z	75.735° E	33.015°	2026-06-23 02:57:55.442Z	141.176° SSE
9 mins	2026-06-23 04:33:55.442Z	325.273° NNW	2026-06-23 04:37:55.442Z	278.001° WNW	26.592°	2026-06-23 04:42:55.442Z	219.035° SW

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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-8 R/B, 20509 on other resources

View SL-8 R/B, 20509 on Heavens-Above

View SL-8 R/B, 20509 on Keep Track

View SL-8 R/B, 20509 on Celestrak

View SL-8 R/B, 20509 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-8 R/B, 20509

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: 2026-06-20T09:38:10.049Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #17 in the year 1990 (1990-02-27 UTC)

SL-8 R/B Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-8 R/B, 20509 on other resources

Documentation

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