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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
877 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Edit Sat Name
Focus sentinelFocus sentinel
Create New Watchlist
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, 1.1 m
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 9 hours ago
TLE from 9 hours ago
0 SL-3 R/B
1 877U 64053B 26304.16370273 .00000051 00000-0 34162-4 0 9990
2 877 65.0783 0.8030 0073122 217.4043 142.1955 14.61485653301206Epoch: 2026-10-31T03:55Z
TLE epoch observation values (Epoch: 2026-10-31T03:55:43.915Z)
Latitude
-0.0001°
Longitude
-97.60339°
Altitude
731.358 km
Speed
7.468 km/s
True Right ascension
00h 03m 12s
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
08:54:42
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
738.59 km
Perigee altitude
635.268 km
Semi-major axis
7,065.066 km
Eccentricity
0.00731
Inclination
65.0783°
RAAN
0.803°
Arg. of periapsis
217.4043°
True anomaly
142.70543°
Mean anomaly
142.1955°
Eccentric anomaly
142.45083°
Mean motion
3.65484 °/min
Orbital period
98.5 mins
BSTAR
0.000034162
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #53 in the year 1964 (1964-08-28 UTC)
Did you know?
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
Loading observer location...
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 | 2026-10-31 14:18:44.864Z | 336.642° NNW | 2026-10-31 14:23:44.864Z | 64.377° ENE | 54.56° | 2026-10-31 14:27:44.864Z | 131.73° SE |
| 4 mins | 2026-10-31 16:02:44.864Z | 276.86° WNW | 2026-10-31 16:04:44.864Z | 247.514° W | 16.833° | 2026-10-31 16:06:44.864Z | 219.837° SW |
| 7 mins | 2026-11-01 04:41:44.864Z | 161.914° S | 2026-11-01 04:44:44.864Z | 115.46° SE | 29.216° | 2026-11-01 04:48:44.864Z | 56.542° ENE |
| 8 mins | 2026-11-01 06:22:44.864Z | 248.551° W | 2026-11-01 06:25:44.864Z | 296.571° NW | 37.141° | 2026-11-01 06:30:44.864Z | 15.87° 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 descending order |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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 descending order |
|---|