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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, 8.5 m

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 9 hours ago

TLE from 9 hours ago

0 COSMOS 203
1 03129U 68011A   26253.48536738  .00000007  00000-0  66372-4 0  9998
2 03129  74.0542 325.5597 0011771 147.7392 224.3498 13.18306402817225

Epoch: 2026-09-10T11:38Z

TLE epoch observation values (Epoch: 2026-09-10T11:38:55.741Z)

Latitude

11.48904°

Longitude

164.61744°

Altitude

1,199.287 km

Speed

7.252 km/s

True Right ascension

21h 55m 29s

True Declination

11° 25' 34"

Sunlit

Object was in full shadow 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

12:54:57

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,197.858 km

Perigee altitude

1,180.043 km

Semi-major axis

7,567.087 km

Eccentricity

0.00118

Inclination

74.0542°

RAAN

325.5597°

Arg. of periapsis

147.7392°

True anomaly

224.25561°

Mean anomaly

224.3498°

Eccentric anomaly

224.30269°

Mean motion

3.29724 °/min

Orbital period

109.18 mins

BSTAR

0.000066372

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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.
13 mins	2026-09-11 05:54:52.128Z	188.754° SSW	2026-09-11 06:00:52.128Z	75.242° E	74.93°	2026-09-11 06:07:52.128Z	21.946° NNE
9 mins	2026-09-11 07:48:52.128Z	269.002° W	2026-09-11 07:52:52.128Z	308.33° NW	21.614°	2026-09-11 07:57:52.128Z	352.646° N
12 mins	2026-09-11 15:29:52.128Z	356.181° N	2026-09-11 15:34:52.128Z	52.756° ENE	48.16°	2026-09-11 15:41:52.128Z	137.284° SSE
10 mins	2026-09-11 17:21:52.128Z	312.541° NW	2026-09-11 17:26:52.128Z	256.385° W	30.567°	2026-09-11 17:31:52.128Z	208.402° 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: 9 hours ago

TLE from 9 hours ago

TLE epoch observation values (Epoch: 2026-09-10T11:38:55.741Z)

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: 9 hours ago