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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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
CYL, 1.9 m
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 13 hours ago
TLE from 13 hours ago
0 SL-3 R/B
1 00877U 64053B 26245.04067469 .00000046 00000-0 33194-4 0 9999
2 00877 65.0769 174.1649 0077800 236.7988 122.5636 14.61458708292567Epoch: 2026-09-02T00:58Z
TLE epoch observation values (Epoch: 2026-09-02T00:58:34.293Z)
Latitude
-0.00002°
Longitude
178.32309°
Altitude
720.37 km
Speed
7.48 km/s
True Right ascension
11h 36m 39s
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
05:32:27
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
741.983 km
Perigee altitude
632.049 km
Semi-major axis
7,065.153 km
Eccentricity
0.00778
Inclination
65.0769°
RAAN
174.1649°
Arg. of periapsis
236.7988°
True anomaly
123.31104°
Mean anomaly
122.5636°
Eccentric anomaly
122.93771°
Mean motion
3.65478 °/min
Orbital period
98.5 mins
BSTAR
0.000033194
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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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2026-09-02 20:48:01.965Z | 198.095° SSW | 2026-09-02 20:53:01.965Z | 117.614° SE | 41.97° | 2026-09-02 20:58:01.965Z | 37.669° NE |
| 5 mins | 2026-09-02 22:33:01.965Z | 288.332° WNW | 2026-09-02 22:35:01.965Z | 318.676° NNW | 19.409° | 2026-09-02 22:38:01.965Z | 358.571° N |
| 7 mins | 2026-09-03 05:27:01.965Z | 347.494° N | 2026-09-03 05:30:01.965Z | 48.722° ENE | 36.349° | 2026-09-03 05:34:01.965Z | 124.692° SE |
| 5 mins | 2026-09-03 07:09:01.965Z | 283.462° WNW | 2026-09-03 07:11:01.965Z | 253.146° W | 19.299° | 2026-09-03 07:14:01.965Z | 209.537° SW |
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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