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COSMOS 2166, 21780

Orbit data source: Space-Track

COSMOS 2166, 21780 is a payload satellite owned by UNKS RF (CIS) in LEO that was launched on Tue, 12 Nov 1991 UTC via a TSIKLON-3 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/21780?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21780, 1991-077B

Orbit

LEO

Last TLE update

20 hours ago

Origin

Russian Space Forces (CIS)

Manufacturer

NPO PM

Mission

Defense Communications

Bus & Motor

STRELA-3, Unknown motor

Mass

225 kg wet, 225 kg dry

Launch date (UTC)

1991-11-12 (33 years ago)

Launch vehicle

TSIKLON-3

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 1.6 m

Radar Cross Section

1.257 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 20 hours ago

0 COSMOS 2166
1 21780U 91077B   25128.55825250  .00000041  00000-0  16748-3 0  9996
2 21780  82.5964 144.3347 0003553  21.1659  95.1628 12.63435338544327

Epoch: 2025-05-08T13:23Z

Definitive object data (Epoch: 2025-05-08T13:23:53.015Z)

Latitude

62.7676°

Longitude

-117.81416°

Altitude

1,419.789 km

Speed

7.156 km/s

True Right ascension

20h 39m 08s

True Declination

62° 38' 22"

Sunlit

Object was in daylight at TLE epoch

Visualization TLE readout

Latitude

-73.09017°

Longitude

-78.61678°

Altitude

1,437.241 km

Speed

7.142 km/s

Apparent Right ascension

03h 37m 15s

Apparent Declination

-64° 56' 09"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

17:17:17

Azimuth

158.228° S

Elevation

-61.128°

Doppler factor

Orbital elements

Apogee altitude

1,408.881 km

Perigee altitude

1,403.35 km

Semi-major axis

7,784.252 km

Eccentricity

0.0003553

Inclination

82.5964°

RAAN

144.3347°

Arg. of periapsis

21.1659°

True anomaly

95.20335°

Mean anomaly

95.1628°

Eccentric anomaly

95.18307°

Mean motion

3.16022 °/min

BSTAR

0.00016748

Orbital period

113.92 mins

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Other satellites on launch #77 in the year 1991 (1991-11-12 UTC)

COSMOS 2166 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.
15 mins	2025-05-09 12:12:01.203Z	3.62° NNE	2025-05-09 12:19:01.203Z	72.012° E	38.288°	2025-05-09 12:27:01.203Z	151.663° SSE
12 mins	2025-05-09 14:08:01.203Z	327.753° NNW	2025-05-09 14:14:01.203Z	271.674° WNW	27.611°	2025-05-09 14:20:01.203Z	220.553° SW
14 mins	2025-05-10 01:00:01.203Z	158.435° S	2025-05-10 01:06:01.203Z	95.861° ESE	38.207°	2025-05-10 01:14:01.203Z	17.597° NNE
12 mins	2025-05-10 02:56:01.203Z	236.566° WSW	2025-05-10 03:01:01.203Z	283.366° WNW	27.956°	2025-05-10 03:08:01.203Z	347.161° N

Authenticating...

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Check out COSMOS 2166, 21780 on other resources

View COSMOS 2166, 21780 on NASA - NSSDCA Website

View COSMOS 2166, 21780 on Heavens-Above

View COSMOS 2166, 21780 on Keep Track

View COSMOS 2166, 21780 on Celestrak

View COSMOS 2166, 21780 on Gunter's Space Page

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