SL-3 R/B, 877
Orbit data source: Space-Track
SL-3 R/B, 877 is space debris in LEO originally from a launch on Fri, 28 Aug 1964 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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Edit Public Description
Identifier
Orbit
Country
CISRelated business
Manufacturer
Progress
Mission
Spacecraft
Bus & Motor
BLOK-E, Unknown motor
Mass
1,440 kg wet, 1,440 kg dry
Launch date (UTC)
Launch vehicle
Unknown
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 1 day ago
TLE from 1 day ago
0 SL-3 R/B
1 877U 64053B 25322.27643654 .00000672 00000-0 15552-3 0 9997
2 877 65.0769 297.8393 0071626 328.5991 31.0841 14.61238224250510Epoch: 2025-11-18T06:38Z
TLE epoch observation values (Epoch: 2025-11-18T06:38:04.117Z)
Latitude
-0°
Longitude
140.7573°
Altitude
647.926 km
Speed
7.557 km/s
True Right ascension
19h 51m 21s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
05:30:43
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
738.337 km
Perigee altitude
637.117 km
Semi-major axis
7,065.864 km
Eccentricity
0.00716
Inclination
65.0769°
RAAN
297.8393°
Arg. of periapsis
328.5991°
True anomaly
31.51113°
Mean anomaly
31.0841°
Eccentric anomaly
31.29729°
Mean motion
3.65422 °/min
Orbital period
98.52 mins
BSTAR
0.00015552
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Other satellites on launch #53 in the year 1964 (1964-08-28 UTC)
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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.SL-3 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. |
|---|---|---|---|---|---|---|---|
| 9 mins | 2025-11-19 09:27:40.263Z | 321.125° NNW | 2025-11-19 09:32:40.263Z | 227.806° WSW | 41.007° | 2025-11-19 09:36:40.263Z | 165.068° S |
| 7 mins | 2025-11-19 23:50:40.263Z | 198.387° SSW | 2025-11-19 23:53:40.263Z | 131.089° SE | 43.172° | 2025-11-19 23:57:40.263Z | 37.331° NE |
| 5 mins | 2025-11-20 01:33:40.263Z | 288.23° WNW | 2025-11-20 01:35:40.263Z | 317.11° NNW | 16.681° | 2025-11-20 01:38:40.263Z | 357.005° N |
| 8 mins | 2025-11-20 08:27:40.263Z | 344.406° N | 2025-11-20 08:30:40.263Z | 44.142° NE | 38.828° | 2025-11-20 08:35:40.263Z | 131.819° SE |
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 |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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