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COSMOS 1861, 18129

Orbit data source: Space-Track

COSMOS 1861, 18129 is a payload satellite owned by VMF (CIS) in LEO that was launched on Tue, 23 Jun 1987 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/18129?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

18129, 1987-054A

Orbit

LEO

Last TLE update

17 hours ago

Origin

Russian Navy (CIS)

Manufacturer

Omsk Av. Zav.

Mission

Civil Navigation

Bus & Motor

KAUR-1 11F643, Unknown motor

Mass

800 kg wet, 800 kg dry

Launch date (UTC)

1987-06-23 (38 years ago)

Launch vehicle

KOSMOS 11K65M

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 2.5 m

Radar Cross Section

9.978 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 17 hours ago

0 COSMOS 1861
1 18129U 87054A   25214.46073557  .00000059  00000-0  47772-4 0  9991
2 18129  82.9252 198.7884 0012985 116.5732 356.3952 13.73231558909791

Epoch: 2025-08-02T11:03Z

TLE epoch observation values (Epoch: 2025-08-02T11:03:27.553Z)

Latitude

66.11544°

Longitude

-114.56271°

Altitude

989.873 km

Speed

7.368 km/s

True Right ascension

00h 10m 23s

True Declination

65° 59' 31"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

74.64552°

Longitude

107.81344°

Altitude

993.266 km

Speed

7.365 km/s

Apparent Right ascension

07h 37m 23s

Apparent Declination

38° 02' 27"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

18:09:33

Azimuth

342.628° N

Elevation

-9.488°

Doppler factor

Orbital elements

Apogee altitude

994.705 km

Perigee altitude

975.583 km

Semi-major axis

7,363.281 km

Eccentricity

0.0013

Inclination

82.9252°

RAAN

198.7884°

Arg. of periapsis

116.5732°

True anomaly

356.38583°

Mean anomaly

356.3952°

Eccentric anomaly

356.39052°

Mean motion

3.43507 °/min

Orbital period

104.8 mins

BSTAR

0.000047772

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Other satellites on launch #54 in the year 1987 (1987-06-23 UTC)

SL-8 R/B, 18130

SL-8 DEB, 18131

SL-8 DEB, 18276

COSMOS 1861 Visibility forecast

Observer location: undefined°, undefined°

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.
9 mins	2025-08-03 09:50:00.085Z	20.186° NNE	2025-08-03 09:54:00.085Z	65.398° ENE	24.727°	2025-08-03 09:59:00.085Z	126.105° SE
10 mins	2025-08-03 11:36:00.085Z	332.277° NNW	2025-08-03 11:40:00.085Z	276.527° WNW	33.979°	2025-08-03 11:46:00.085Z	201.872° SSW
10 mins	2025-08-03 23:21:00.085Z	170.302° S	2025-08-03 23:26:00.085Z	70.559° E	41.853°	2025-08-03 23:31:00.085Z	14.3° NNE
6 mins	2025-08-04 01:09:00.085Z	260.403° W	2025-08-04 01:12:00.085Z	294.095° NW	17.614°	2025-08-04 01:15:00.085Z	326.25° NNW

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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Authenticating...

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Check out COSMOS 1861, 18129 on other resources

View COSMOS 1861, 18129 on NASA - NSSDCA Website

View COSMOS 1861, 18129 on Heavens-Above

View COSMOS 1861, 18129 on Keep Track

View COSMOS 1861, 18129 on Celestrak

View COSMOS 1861, 18129 on Gunter's Space Page

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