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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.

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https://www.satcat.com/sats-embedded/3129?theme=dark&initialShowStats=false

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Identifier

3129, 1968-011A

Orbit

LEO

Country

CIS

Related business

Federal Space Agency of Russia (Roscosmos) (RU)

Manufacturer

OKB-10

Mission

Spacecraft

Bus & Motor

KAUR-1 11F621, Unknown motor

Mass

800 kg wet, 800 kg dry

Launch date (UTC)

1968-02-20 (58 years ago)

Launch vehicle

KOSMOS 11K65M

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 7 hours ago

TLE from 7 hours ago

0 COSMOS 203
1  3129U 68011A   26036.77675156  .00000193  00000-0  53960-3 0  9991
2  3129  74.0525 291.1413 0012114 157.7502 267.9202 13.18300123788662

Epoch: 2026-02-05T18:38Z

TLE epoch observation values (Epoch: 2026-02-05T18:38:31.334Z)

Latitude

61.16246°

Longitude

-93.32552°

Altitude

1,201.646 km

Speed

7.259 km/s

True Right ascension

21h 28m 54s

True Declination

61° 01' 32"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

03:54:12

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,198.141 km

Perigee altitude

1,179.808 km

Semi-major axis

7,567.112 km

Eccentricity

0.00121

Inclination

74.0525°

RAAN

291.1413°

Arg. of periapsis

157.7502°

True anomaly

267.78148°

Mean anomaly

267.9202°

Eccentric anomaly

267.85084°

Mean motion

3.29722 °/min

Orbital period

109.18 mins

BSTAR

0.0005396

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Other satellites on launch #11 in the year 1968 (1968-02-20 UTC)

SL-8 DEB, 3147 (Decayed)

SL-8 R/B, 3131

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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.

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COSMOS 203 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.
6 mins	2026-02-06 02:10:47.958Z	22.182° NNE	2026-02-06 02:13:47.958Z	47.926° ENE	13.94°	2026-02-06 02:16:47.958Z	73.753° E
13 mins	2026-02-06 04:00:47.958Z	346.711° N	2026-02-06 04:06:47.958Z	83.314° E	43.593°	2026-02-06 04:13:47.958Z	154.228° SSE
8 mins	2026-02-06 05:53:47.958Z	299.201° NW	2026-02-06 05:56:47.958Z	270.984° WNW	18.408°	2026-02-06 06:01:47.958Z	226.23° WSW
6 mins	2026-02-06 16:18:47.958Z	115.922° SE	2026-02-06 16:21:47.958Z	88.876° E	15.631°	2026-02-06 16:24:47.958Z	62.647° ENE
13 mins	2026-02-06 18:05:47.958Z	200.315° SSW	2026-02-06 18:11:47.958Z	261.343° W	44.811°	2026-02-06 18:18:47.958Z	17.63° NNE
7 mins	2026-02-06 20:01:47.958Z	284.75° WNW	2026-02-06 20:04:47.958Z	312.603° NW	16.241°	2026-02-06 20:08:47.958Z	346.645° N

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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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Check out COSMOS 203, 3129 on other resources

View COSMOS 203, 3129 on NASA - NSSDCA Website

View COSMOS 203, 3129 on Heavens-Above

View COSMOS 203, 3129 on Keep Track

View COSMOS 203, 3129 on Celestrak

View COSMOS 203, 3129 on Gunter's Space Page

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

COSMOS 203, 3129

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 7 hours ago

TLE from 7 hours ago

TLE epoch observation values (Epoch: 2026-02-05T18:38:31.334Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #11 in the year 1968 (1968-02-20 UTC)

COSMOS 203 Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 203, 3129 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 7 hours ago