COSMOS 203, 3129
Orbit data source: Space-Track
COSMOS 203, 3129 is a payload satellite owned by OKB-10 (CIS) in LEO that was launched on Tue, 20 Feb 1968 UTC via a KOSMOS 11K65M launch vehicle from the Plesetsk Missile And Space Complex (PKMTR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
3129 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
Edit Public Description
Identifier
Orbit
Country
CISRelated business
Manufacturer
OKB-10
Mission
Spacecraft
Bus & Motor
KAUR-1 11F621, Unknown motor
Mass
800 kg wet, 800 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 5 hours ago
TLE from 5 hours ago
0 COSMOS 203
1 3129U 68011A 25336.13025494 -.00000028 00000-0 -21428-4 0 9991
2 3129 74.0538 29.7675 0013301 266.8087 120.7033 13.18297674780015Epoch: 2025-12-02T03:07Z
TLE epoch observation values (Epoch: 2025-12-02T03:07:34.026Z)
Latitude
26.53424°
Longitude
-80.18337°
Altitude
1,199.19 km
Speed
7.254 km/s
True Right ascension
02h 31m 42s
True Declination
26° 24' 18"
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
06:04:21
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,199.049 km
Perigee altitude
1,178.919 km
Semi-major axis
7,567.121 km
Eccentricity
0.00133
Inclination
74.0538°
RAAN
29.7675°
Arg. of periapsis
266.8087°
True anomaly
120.83424°
Mean anomaly
120.7033°
Eccentric anomaly
120.76878°
Mean motion
3.29721 °/min
Orbital period
109.18 mins
BSTAR
-0.000021428
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 #11 in the year 1968 (1968-02-20 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.COSMOS 203 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. |
|---|---|---|---|---|---|---|---|
| 14 mins | 2025-12-02 14:29:06.059Z | 350.615° N | 2025-12-02 14:36:06.059Z | 68.573° E | 38.224° | 2025-12-02 14:43:06.059Z | 141.082° SSE |
| 10 mins | 2025-12-02 16:22:06.059Z | 313.553° NW | 2025-12-02 16:27:06.059Z | 261.908° W | 25.965° | 2025-12-02 16:32:06.059Z | 212.316° SW |
| 13 mins | 2025-12-03 04:35:06.059Z | 185.378° SSW | 2025-12-03 04:41:06.059Z | 121.002° SE | 43.113° | 2025-12-03 04:48:06.059Z | 24.183° NE |
| 10 mins | 2025-12-03 06:29:06.059Z | 262.119° W | 2025-12-03 06:33:06.059Z | 300.807° NW | 21.838° | 2025-12-03 06:39:06.059Z | 355.671° N |
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 |
|---|