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COSMOS 1989 (ETALON 1), 19751

Orbit data source: Space-Track

COSMOS 1989 (ETALON 1), 19751 is a payload satellite owned by NPO PM (CIS) in MEO that was launched on Tue, 10 Jan 1989 UTC via a PROTON-K/DM-2 launch vehicle from the Tyuratam Missile And Space Complex (TTMTR). 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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Identifier

19751, 1989-001C

Orbit

MEO

Country

CIS

Related business

Federal Space Agency of Russia (Roscosmos) (RU)

Manufacturer

OAZ?

Mission

Operational Defense Geodetic

Bus & Motor

ETALON, Unknown motor

Mass

1,230 kg wet, 1,230 kg dry

Launch date (UTC)

1989-01-10 (38 years ago)

Launch vehicle

PROTON-K/DM-2

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Sphere, 0.6 m

Radar Cross Section

1.307 m², Large (>1 m²)

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

TLE from 2 days ago

0 COSMOS 1989 (ETALON 1)
1 19751U 89001C   26251.96489352  .00000029  00000-0  00000+0 0  9993
2 19751  64.9992  69.3329 0023379 217.4073 315.0872  2.13155931293150

Epoch: 2026-09-08T23:09Z

TLE epoch observation values (Epoch: 2026-09-08T23:09:26.800Z)

Latitude

6.96914°

Longitude

-89.32547°

Altitude

19,083.495 km

Speed

3.96 km/s

True Right ascension

16h 24m 14s

True Declination

6° 57' 27"

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

02:59:50

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

19,184.824 km

Perigee altitude

19,065.575 km

Semi-major axis

25,503.337 km

Eccentricity

0.00234

Inclination

64.9992°

RAAN

69.3329°

Arg. of periapsis

217.4073°

True anomaly

314.89766°

Mean anomaly

315.0872°

Eccentric anomaly

314.99247°

Mean motion

0.5329 °/min

Orbital period

675.55 mins

BSTAR

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Computing Atmospheric mass density...

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Other satellites on launch #1 in the year 1989 (1989-01-10 UTC)

SL-12 DEB, 36882

SL-12 DEB, 26046 (Decayed)

SL-12 R/B(1), 19752 (Decayed)

SL-12 DEB, 38556 (Decayed)

SL-12 DEB, 25799 (Decayed)

SL-12 DEB, 28259 (Decayed)

SL-12 DEB, 25797 (Decayed)

SL-12 DEB, 28257 (Decayed)

SL-12 DEB, 26814 (Decayed)

SL-12 DEB, 28258 (Decayed)

SL-12 DEB, 28260 (Decayed)

SL-12 DEB, 26047 (Decayed)

SL-12 DEB, 36883 (Decayed)

SL-12 DEB, 19753

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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 1989 (ETALON 1) 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.
333 mins	2026-09-11 12:28:26.768Z	195.411° SSW	2026-09-11 14:52:26.768Z	295.732° NW	76.246°	2026-09-11 18:01:26.768Z	74.556° E
50 mins	2026-09-12 03:49:26.768Z	331.799° NNW	2026-09-12 04:13:26.768Z	320.438° NNW	11.798°	2026-09-12 04:39:26.768Z	307.811° NW

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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 1989 (ETALON 1), 19751 on other resources

View COSMOS 1989 (ETALON 1), 19751 on NASA - NSSDCA Website

View COSMOS 1989 (ETALON 1), 19751 on Heavens-Above

View COSMOS 1989 (ETALON 1), 19751 on Keep Track

View COSMOS 1989 (ETALON 1), 19751 on Celestrak

View COSMOS 1989 (ETALON 1), 19751 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 1989 (ETALON 1), 19751

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: 2026-09-08T23:09:26.800Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #1 in the year 1989 (1989-01-10 UTC)

COSMOS 1989 (ETALON 1) Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 1989 (ETALON 1), 19751 on other resources

Documentation

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