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COSMOS 1639, 15621

Orbit data source: Space-Track

COSMOS 1639, 15621 is a payload satellite in LEO that was launched on Thu, 21 Mar 1985 UTC via a KOSMOS 11K65M 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/15621?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/15621?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

15621, 1985-023E

Orbit

LEO

Last TLE update

22 hours ago

Origin

Russian Space Forces (RU)

Manufacturer

NPO PM

Mission

Defense Communications

Bus & Motor

STRELA-1 11F625, Unknown motor

Mass

60 kg wet, 60 kg dry

Launch date (UTC)

1985-03-21 (40 years ago)

Launch vehicle

KOSMOS 11K65M

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Sphere, 0.8 m

Radar Cross Section

0.588 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 22 hours ago

0 COSMOS 1639
1 15621U 85023E   25141.67798284  .00000011  00000-0  17568-3 0  9999
2 15621  74.0522 127.9884 0025604 305.5215 229.1502 12.51051019834724

Epoch: 2025-05-21T16:16Z

TLE epoch observation values (Epoch: 2025-05-21T16:16:17.717Z)

Latitude

5.26413°

Longitude

-177.14517°

Altitude

1,475.115 km

Speed

7.12 km/s

True Right ascension

20h 25m 56s

True Declination

5° 14' 08"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-34.72009°

Longitude

-8.22117°

Altitude

1,453.837 km

Speed

7.143 km/s

Apparent Right ascension

09h 11m 23s

Apparent Declination

-39° 51' 53"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

23:11:55

Azimuth

99.67° ESE

Elevation

-66.992°

Doppler factor

Orbital elements

Apogee altitude

1,477.997 km

Perigee altitude

1,437.87 km

Semi-major axis

7,836.071 km

Eccentricity

0.00256

Inclination

74.0522°

RAAN

127.9884°

Arg. of periapsis

305.5215°

True anomaly

Unknown

Mean anomaly

229.1502°

Eccentric anomaly

Unknown

Mean motion

3.12893 °/min

Orbital period

115.06 mins

BSTAR

0.00017568

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Other satellites on launch #23 in the year 1985 (1985-03-21 UTC)

COSMOS 1639 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.
7 mins	2025-05-22 22:11:33.479Z	113.22° SE	2025-05-22 22:14:33.479Z	91.259° ESE	14.689°	2025-05-22 22:18:33.479Z	61.784° ENE
16 mins	2025-05-23 00:03:33.479Z	193.028° SSW	2025-05-23 00:10:33.479Z	159.175° S	44.599°	2025-05-23 00:19:33.479Z	20.456° NNE
11 mins	2025-05-23 02:04:33.479Z	267.154° W	2025-05-23 02:09:33.479Z	308.036° NW	21.257°	2025-05-23 02:15:33.479Z	354.811° N
10 mins	2025-05-23 08:14:33.479Z	15.457° NNE	2025-05-23 08:18:33.479Z	47.111° ENE	18.968°	2025-05-23 08:24:33.479Z	92.148° ESE
15 mins	2025-05-23 10:10:33.479Z	342.557° N	2025-05-23 10:17:33.479Z	53.058° ENE	44.886°	2025-05-23 10:25:33.479Z	160.605° S
9 mins	2025-05-23 12:09:33.479Z	303.551° NW	2025-05-23 12:13:33.479Z	273.428° WNW	17.891°	2025-05-23 12:18:33.479Z	235.271° WSW

Authenticating...

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Check out COSMOS 1639, 15621 on other resources

View COSMOS 1639, 15621 on NASA - NSSDCA Website

View COSMOS 1639, 15621 on Heavens-Above

View COSMOS 1639, 15621 on Keep Track

View COSMOS 1639, 15621 on Celestrak

View COSMOS 1639, 15621 on Gunter's Space Page

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