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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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Iframe URL

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: 14 hours ago

TLE from 14 hours ago

0 COSMOS 203
1  3129U 68011A   26060.99339101  .00000051  00000-0  17900-3 0  9996
2  3129  74.0488 254.7553 0011753 114.5869 359.1242 13.18301340791850

Epoch: 2026-03-01T23:50Z

TLE epoch observation values (Epoch: 2026-03-01T23:50:28.983Z)

Latitude

61.78199°

Longitude

-114.66122°

Altitude

1,192.53 km

Speed

7.268 km/s

True Right ascension

02h 51m 00s

True Declination

61° 38' 48"

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

17:10:51

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,197.864 km

Perigee altitude

1,180.077 km

Semi-major axis

7,567.107 km

Eccentricity

0.00118

Inclination

74.0488°

RAAN

254.7553°

Arg. of periapsis

114.5869°

True anomaly

359.12214°

Mean anomaly

359.1242°

Eccentric anomaly

359.12317°

Mean motion

3.29722 °/min

Orbital period

109.18 mins

BSTAR

0.000179

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

SL-8 R/B, 3131

SL-8 DEB, 3147 (Decayed)

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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.
14 mins	2026-03-02 13:55:55.136Z	192.689° SSW	2026-03-02 14:02:55.136Z	84.002° E	44.684°	2026-03-02 14:09:55.136Z	20.893° NNE
9 mins	2026-03-02 15:50:55.136Z	268.684° W	2026-03-02 15:54:55.136Z	305.83° NW	18.948°	2026-03-02 15:59:55.136Z	350.614° N
12 mins	2026-03-02 23:31:55.136Z	353.935° N	2026-03-02 23:37:55.136Z	74.379° E	38.317°	2026-03-02 23:43:55.136Z	139.587° SSE
10 mins	2026-03-03 01:23:55.136Z	312.064° NW	2026-03-03 01:28:55.136Z	259.039° W	25.331°	2026-03-03 01:33:55.136Z	211.548° SW

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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: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-03-01T23:50:28.983Z)

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: 14 hours ago