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COSMOS 2139 (GLONASS), 21216

Orbit data source: Space-Track

COSMOS 2139 (GLONASS), 21216 is a payload satellite owned by UNKS RF (CIS) in MEO that was launched on Thu, 04 Apr 1991 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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https://www.satcat.com/sats-embedded/21216?theme=dark&initialShowStats=false

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Identifier

21216, 1991-025A

Orbit

MEO

Country

CIS

Related business

Russian Space Forces (RU)

Manufacturer

Polyot

Mission

Non-operational Defense Navigation

Bus & Motor

URAGAN, Unknown motor

Mass

1,300 kg wet, ~1,200 kg dry

Launch date (UTC)

1991-04-04 (35 years ago)

Launch vehicle

PROTON-K/DM-2

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl + 2 Pan, 4.2 m

Radar Cross Section

14.707 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 5 days ago

TLE from 5 days ago

0 COSMOS 2139 (GLONASS)
1 21216U 91025A   26168.89191860 -.00000050  00000-0  00000+0 0  9999
2 21216  64.3628 304.3816 0016625 219.8718 139.9983  2.13105796273945

Epoch: 2026-06-17T21:24Z

TLE epoch observation values (Epoch: 2026-06-17T21:24:21.767Z)

Latitude

0.00004°

Longitude

77.13064°

Altitude

19,162.62 km

Speed

3.948 km/s

True Right ascension

20h 17m 27s

True Declination

0° 00' 00"

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

02:00:08

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

19,171.628 km

Perigee altitude

19,086.816 km

Semi-major axis

25,507.359 km

Eccentricity

0.00166

Inclination

64.3628°

RAAN

304.3816°

Arg. of periapsis

219.8718°

True anomaly

140.12057°

Mean anomaly

139.9983°

Eccentric anomaly

140.05945°

Mean motion

0.53278 °/min

Orbital period

675.71 mins

BSTAR

Loading maneuver chart data...

Computing Atmospheric mass density...

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Other satellites on launch #25 in the year 1991 (1991-04-04 UTC)

SL-12 DEB, 34805 (Decayed)

SL-12 DEB, 34935 (Decayed)

SL-12 DEB, 34798 (Decayed)

SL-12 DEB *, 35314

SL-12 DEB, 35313 (Decayed)

SL-12 DEB, 34801

SL-12 DEB, 34804 (Decayed)

SL-12 DEB, 34666 (Decayed)

SL-12 DEB, 34665 (Decayed)

SL-12 DEB, 35084

SL-12 DEB, 35056

SL-12 DEB, 47344 (Decayed)

SL-12 DEB, 35309 (Decayed)

COSMOS 2140 (GLONASS), 21217

SL-12 R/B(AUX MOTOR), 21226

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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 2139 (GLONASS) 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.
328 mins	2026-06-22 14:57:22.919Z	280.963° WNW	2026-06-22 17:58:22.919Z	55.632° ENE	43.303°	2026-06-22 20:25:22.919Z	156.457° SSE
156 mins	2026-06-23 12:21:22.919Z	237.914° WSW	2026-06-23 14:57:22.919Z	332.393° NNW	39.438°	2026-06-23 14:57:22.919Z	332.393° NNW

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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 2139 (GLONASS), 21216 on other resources

View COSMOS 2139 (GLONASS), 21216 on NASA - NSSDCA Website

View COSMOS 2139 (GLONASS), 21216 on Heavens-Above

View COSMOS 2139 (GLONASS), 21216 on Keep Track

View COSMOS 2139 (GLONASS), 21216 on Celestrak

View COSMOS 2139 (GLONASS), 21216 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 2139 (GLONASS), 21216

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 5 days ago

TLE from 5 days ago

TLE epoch observation values (Epoch: 2026-06-17T21:24:21.767Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #25 in the year 1991 (1991-04-04 UTC)

COSMOS 2139 (GLONASS) Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 2139 (GLONASS), 21216 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 5 days ago