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COSMOS 2140 (GLONASS), 21217

Orbit data source: Space-Track

COSMOS 2140 (GLONASS), 21217 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/21217?theme=dark&initialShowStats=false

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Identifier

21217, 1991-025B

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: 2 days ago

TLE from 2 days ago

0 COSMOS 2140 (GLONASS)
1 21217U 91025B   26171.41945244 -.00000062  00000-0  00000+0 0  9998
2 21217  64.3495 304.1808 0027558 215.4205 126.0142  2.13101118274003

Epoch: 2026-06-20T10:04Z

TLE epoch observation values (Epoch: 2026-06-20T10:04:00.690Z)

Latitude

-16.47524°

Longitude

-123.61843°

Altitude

19,175.74 km

Speed

3.946 km/s

True Right ascension

19h 44m 04s

True Declination

-16° 26' 57"

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

02:00:07

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

19,199.89 km

Perigee altitude

19,059.301 km

Semi-major axis

25,507.732 km

Eccentricity

0.00276

Inclination

64.3495°

RAAN

304.1808°

Arg. of periapsis

215.4205°

True anomaly

126.26912°

Mean anomaly

126.0142°

Eccentric anomaly

126.14171°

Mean motion

0.53276 °/min

Orbital period

675.72 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)

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 2140 (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.
199 mins	2026-06-22 21:28:22.533Z	332.952° NNW	2026-06-22 23:06:22.533Z	290.926° WNW	31.924°	2026-06-23 00:47:22.533Z	238.438° WSW
216 mins	2026-06-23 05:51:22.533Z	130.038° SE	2026-06-23 07:40:22.533Z	73.041° E	34.937°	2026-06-23 09:27:22.533Z	28.67° 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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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out COSMOS 2140 (GLONASS), 21217 on other resources

View COSMOS 2140 (GLONASS), 21217 on NASA - NSSDCA Website

View COSMOS 2140 (GLONASS), 21217 on Heavens-Above

View COSMOS 2140 (GLONASS), 21217 on Keep Track

View COSMOS 2140 (GLONASS), 21217 on Celestrak

View COSMOS 2140 (GLONASS), 21217 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 2140 (GLONASS), 21217

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: 2026-06-20T10:04:00.690Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

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

COSMOS 2140 (GLONASS) Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 2140 (GLONASS), 21217 on other resources

Documentation

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