SL-6 R/B(2), 20666

Orbit data source: Space-Track

SL-6 R/B(2), 20666 is space debris in LEO originally from a launch on Thu, 21 Jun 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.

Loading next visibility...

Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/20666?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/20666?theme=dark&initialShowStats=false

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

ISO8601 Format

Identifier

20666, 1990-055D

Orbit

LEO

Last TLE update

6 hours ago

Origin

Russian Strategic Rocket Forces (CIS)

Manufacturer

NPO Energiya

Mission

Spacecraft

Bus & Motor

BLOK-L, Unknown motor

Mass

900 kg wet, 900 kg dry

Launch date (UTC)

1990-06-21 (35 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

TLE from 6 hours ago

0 SL-6 R/B(2)
1 20666U 90055D   25198.49081492  .00001533  00000-0  13048-3 0  9992
2 20666  62.7842 332.7303 0021766 199.8270 160.1985 15.02133052902845

Epoch: 2025-07-17T11:46Z

TLE epoch observation values (Epoch: 2025-07-17T11:46:46.409Z)

Latitude

-0.00001°

Longitude

-139.51894°

Altitude

576.377 km

Speed

7.565 km/s

True Right ascension

22h 10m 55s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

-18.39725°

Longitude

-150.20366°

Altitude

577.793 km

Speed

7.565 km/s

Apparent Right ascension

20h 20m 14s

Apparent Declination

-30° 01' 54"

Sunlit

Object is in full shadow

Visualization observer readout

Local Sidereal Time

06:47:28

Azimuth

290.4° WNW

Elevation

-68.671°

Doppler factor

Orbital elements

Apogee altitude

574.242 km

Perigee altitude

544.043 km

Semi-major axis

6,937.279 km

Eccentricity

0.00218

Inclination

62.7842°

RAAN

332.7303°

Arg. of periapsis

199.827°

True anomaly

Unknown

Mean anomaly

160.1985°

Eccentric anomaly

Unknown

Mean motion

3.75629 °/min

Orbital period

95.84 mins

BSTAR

0.00013048

Loading maneuver chart data...

Loading SW <> Apogee altitude chart data...

Loading historical data...

Other satellites on launch #55 in the year 1990 (1990-06-21 UTC)

COSMOS 2084, 20663

SL-6 R/B(1), 20664 (Decayed)

SL-6 PLAT, 20665 (Decayed)

SL-6 DEB, 43502 (Decayed)

SL-6 R/B(2) Visibility forecast

Observer location: undefined°, undefined°

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.
6 mins	2025-07-17 18:40:41.457Z	349.374° N	2025-07-17 18:43:41.457Z	37.499° NE	23.051°	2025-07-17 18:46:41.457Z	95.564° ESE
5 mins	2025-07-17 20:20:41.457Z	292.375° WNW	2025-07-17 20:22:41.457Z	247.714° W	27.926°	2025-07-17 20:25:41.457Z	185.242° SSW
6 mins	2025-07-18 10:17:41.457Z	178.01° S	2025-07-18 10:20:41.457Z	101.336° ESE	31.618°	2025-07-18 10:23:41.457Z	52.149° ENE
4 mins	2025-07-18 11:57:41.457Z	285.605° WNW	2025-07-18 11:58:41.457Z	305.038° NW	20.923°	2025-07-18 12:01:41.457Z	0.578° NNE

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in ascending order

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in ascending order

Check out SL-6 R/B(2), 20666 on other resources

View SL-6 R/B(2), 20666 on Heavens-Above

View SL-6 R/B(2), 20666 on Keep Track

View SL-6 R/B(2), 20666 on Celestrak

View SL-6 R/B(2), 20666 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.