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COSMOS 1851, 18103

Orbit data source: Space-Track

COSMOS 1851, 18103 is a payload satellite owned by PVO (CIS) in HEO that was launched on Fri, 12 Jun 1987 UTC via an MOLNIYA 8K78M 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/18103?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

18103, 1987-050A

Orbit

HEO

Country

CIS

Related business

Russian Aerospace Forces (RU)

Manufacturer

NPOL/KOMET

Mission

Defense Early Warn

Bus & Motor

OKO, Unknown motor

Mass

~1,250 kg wet, ~1,150 kg dry

Launch date (UTC)

1987-06-12 (39 years ago)

Launch vehicle

MOLNIYA 8K78M

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Irr + 6 Pan, 2.1 m

Radar Cross Section

15.540 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 2 days ago

TLE from 2 days ago

0 COSMOS 1851
1 18103U 87050A   26153.35359448  .00000100  00000-0  00000+0 0  9991
2 18103  70.9300 188.1619 4643688  39.5664  98.6011  2.00428665285496

Epoch: 2026-06-02T08:29Z

TLE epoch observation values (Epoch: 2026-06-02T08:29:10.563Z)

Latitude

-1.96241°

Longitude

-9.29468°

Altitude

26,609.579 km

Speed

3.028 km/s

True Right ascension

00h 35m 18s

True Declination

-1° 57' 36"

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

23:19:52

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

32,532.299 km

Perigee altitude

7,854.373 km

Semi-major axis

26,571.473 km

Eccentricity

0.46437

Inclination

70.93°

RAAN

188.1619°

Arg. of periapsis

39.5664°

True anomaly

142.45499°

Mean anomaly

98.6011°

Eccentric anomaly

121.32832°

Mean motion

0.50109 °/min

Orbital period

718.43 mins

BSTAR

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Computing Atmospheric mass density...

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Other satellites on launch #50 in the year 1987 (1987-06-12 UTC)

SL-6 R/B(2), 18106

SL-6 R/B(1), 18104 (Decayed)

SL-6 PLAT, 18105 (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 1851 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.
80 mins	2026-06-04 17:52:20.209Z	332.836° NNW	2026-06-04 18:23:20.209Z	303.645° NW	17.969°	2026-06-04 19:12:20.209Z	278.034° WNW
95 mins	2026-06-05 04:30:20.209Z	218.019° SW	2026-06-05 05:10:20.209Z	305.265° NW	42.329°	2026-06-05 06:05:20.209Z	38.586° NE

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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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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

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Check out COSMOS 1851, 18103 on other resources

View COSMOS 1851, 18103 on NASA - NSSDCA Website

View COSMOS 1851, 18103 on Heavens-Above

View COSMOS 1851, 18103 on Keep Track

View COSMOS 1851, 18103 on Celestrak

View COSMOS 1851, 18103 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 1851, 18103

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 days ago

TLE from 2 days ago

TLE epoch observation values (Epoch: 2026-06-02T08:29:10.563Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #50 in the year 1987 (1987-06-12 UTC)

COSMOS 1851 Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 1851, 18103 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 days ago