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COSMOS 2170, 21784

Orbit data source: Space-Track

COSMOS 2170, 21784 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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<iframe src="https://www.satcat.com/sats-embedded/21784?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/21784?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21784, 1991-077F

Orbit

LEO

Last TLE update

8 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 (34 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, Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 8 hours ago

0 COSMOS 2170
1 21784U 91077F   25193.21641604  .00000018  00000-0  43040-4 0  9994
2 21784  82.6097 125.2479 0002877  12.0142 154.6184 12.62576463551451

Epoch: 2025-07-12T05:11Z

TLE epoch observation values (Epoch: 2025-07-12T05:11:38.345Z)

Latitude

13.20708°

Longitude

-64.75472°

Altitude

1,416.347 km

Speed

7.153 km/s

True Right ascension

20h 14m 02s

True Declination

13° 08' 14"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

-26.87313°

Longitude

-59.47616°

Altitude

1,424.358 km

Speed

7.147 km/s

Apparent Right ascension

17h 53m 02s

Apparent Declination

-46° 36' 01"

Sunlit

Object is in full shadow

Visualization observer readout

Local Sidereal Time

01:23:04

Azimuth

238.532° WSW

Elevation

-41.911°

Doppler factor

Orbital elements

Apogee altitude

1,411.888 km

Perigee altitude

1,407.407 km

Semi-major axis

7,787.784 km

Eccentricity

0.00029

Inclination

82.6097°

RAAN

125.2479°

Arg. of periapsis

12.0142°

True anomaly

Unknown

Mean anomaly

154.6184°

Eccentric anomaly

Unknown

Mean motion

3.15807 °/min

Orbital period

113.99 mins

BSTAR

0.00004304

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

COSMOS 2170 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	2025-07-12 19:36:50.361Z	163.762° S	2025-07-12 19:44:50.361Z	77.805° E	39.081°	2025-07-12 19:51:50.361Z	17.244° NNE
12 mins	2025-07-12 21:33:50.361Z	236.393° WSW	2025-07-12 21:39:50.361Z	291.729° WNW	26.969°	2025-07-12 21:45:50.361Z	344.636° N
11 mins	2025-07-13 05:39:50.361Z	24.579° NE	2025-07-13 05:44:50.361Z	65.892° ENE	20.227°	2025-07-13 05:50:50.361Z	112.828° SE
15 mins	2025-07-13 07:33:50.361Z	348.51° N	2025-07-13 07:40:50.361Z	254.869° W	44.218°	2025-07-13 07:48:50.361Z	181.965° SSW
4 mins	2025-07-13 09:32:50.361Z	294.687° NW	2025-07-13 09:33:50.361Z	287.147° WNW	12.524°	2025-07-13 09:36:50.361Z	264.982° W

Authenticating...

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Check out COSMOS 2170, 21784 on other resources

View COSMOS 2170, 21784 on NASA - NSSDCA Website

View COSMOS 2170, 21784 on Heavens-Above

View COSMOS 2170, 21784 on Keep Track

View COSMOS 2170, 21784 on Celestrak

View COSMOS 2170, 21784 on Gunter's Space Page

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