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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 (59 years ago)

Launch vehicle

KOSMOS 11K65M

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

CYL + ANT, 1.1 m

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 6 hours ago

TLE from 6 hours ago

0 COSMOS 203
1  3129U 68011A   26306.83427314  .00000182  00000-0  51201-3 0  9993
2  3129  74.0516 245.3997 0011573  51.2656 338.7186 13.18307460824251

Epoch: 2026-11-02T20:01Z

TLE epoch observation values (Epoch: 2026-11-02T20:01:21.199Z)

Latitude

28.72351°

Longitude

-88.08027°

Altitude

1,186.164 km

Speed

7.267 km/s

True Right ascension

16h 57m 27s

True Declination

28° 35' 13"

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

21:28:19

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,197.704 km

Perigee altitude

1,180.189 km

Semi-major axis

7,567.084 km

Eccentricity

0.00116

Inclination

74.0516°

RAAN

245.3997°

Arg. of periapsis

51.2656°

True anomaly

338.6704°

Mean anomaly

338.7186°

Eccentric anomaly

338.69451°

Mean motion

3.29724 °/min

Orbital period

109.18 mins

BSTAR

0.00051201

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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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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.
8 mins	2026-11-03 05:33:27.420Z	17.439° NNE	2026-11-03 05:37:27.420Z	53.199° ENE	17.224°	2026-11-03 05:41:27.420Z	87.575° E
13 mins	2026-11-03 07:23:27.420Z	342.433° N	2026-11-03 07:29:27.420Z	23.186° NE	82.971°	2026-11-03 07:36:27.420Z	160.652° S
6 mins	2026-11-03 09:17:27.420Z	292.525° NW	2026-11-03 09:20:27.420Z	265.479° W	15.858°	2026-11-03 09:23:27.420Z	239.765° WSW
8 mins	2026-11-03 19:41:27.420Z	122.376° SE	2026-11-03 19:44:27.420Z	92.965° ESE	20.027°	2026-11-03 19:49:27.420Z	49.46° ENE
12 mins	2026-11-03 21:29:27.420Z	208.908° SW	2026-11-03 21:35:27.420Z	314.545° NW	69.691°	2026-11-03 21:41:27.420Z	13.832° NNE
6 mins	2026-11-03 23:25:27.420Z	291.394° WNW	2026-11-03 23:27:27.420Z	308.657° NW	14.095°	2026-11-03 23:31:27.420Z	342.231° 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: 6 hours ago

TLE from 6 hours ago

TLE epoch observation values (Epoch: 2026-11-02T20:01:21.199Z)

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: 6 hours ago