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COSMOS 2550, 48865

Orbit data source: Space-Track

COSMOS 2550, 48865 is a payload satellite owned by VVKO VKS (CIS) in LEO that was launched on Fri, 25 Jun 2021 UTC via a SOYUZ-2-1B 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/48865?theme=dark&initialShowStats=false

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Identifier

48865, 2021-056A

Orbit

LEO

Country

CIS

Related business

Russian Space Forces (RU)

Manufacturer

TSSKBP/ARSLO

Mission

Operational Defense Sigint

Bus & Motor

PION-NKS, Unknown motor

Mass

7,231 kg wet, ~6,700 kg dry

Launch date (UTC)

2021-06-25 (5 years ago)

Launch vehicle

SOYUZ-2-1B

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl + 2 Pan, 4.3 m

Radar Cross Section

24.037 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 1 day ago

TLE from 1 day ago

0 COSMOS 2550
1 48865U 21056A   26118.85757205 -.00000109  00000-0  25227-5 0  9996
2 48865  67.1429 249.1245 0008399 269.8654  90.1538 15.33829624271153

Epoch: 2026-04-28T20:34Z

TLE epoch observation values (Epoch: 2026-04-28T20:34:54.225Z)

Latitude

-0°

Longitude

83.5717°

Altitude

466.663 km

Speed

7.633 km/s

True Right ascension

16h 36m 29s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

06:37:42

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

468.388 km

Perigee altitude

456.896 km

Semi-major axis

6,840.779 km

Eccentricity

0.00084

Inclination

67.1429°

RAAN

249.1245°

Arg. of periapsis

269.8654°

True anomaly

90.25004°

Mean anomaly

90.1538°

Eccentric anomaly

90.20192°

Mean motion

3.83605 °/min

Orbital period

93.85 mins

BSTAR

0.0000025227

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Other satellites on launch #56 in the year 2021 (2021-06-25 UTC)

SL-4 R/B, 48866 (Decayed)

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COSMOS 2550 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.
6 mins	2026-04-30 10:17:30.554Z	221.499° SW	2026-04-30 10:20:30.554Z	320.356° NNW	40.541°	2026-04-30 10:23:30.554Z	20.391° NNE
4 mins	2026-04-30 18:30:30.554Z	11.284° NNE	2026-04-30 18:32:30.554Z	62.017° ENE	23.823°	2026-04-30 18:34:30.554Z	105.064° ESE

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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 2550, 48865 on other resources

View COSMOS 2550, 48865 on NASA - NSSDCA Website

View COSMOS 2550, 48865 on Heavens-Above

View COSMOS 2550, 48865 on Keep Track

View COSMOS 2550, 48865 on Celestrak

View COSMOS 2550, 48865 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 2550, 48865

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 1 day ago

TLE from 1 day ago

TLE epoch observation values (Epoch: 2026-04-28T20:34:54.225Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #56 in the year 2021 (2021-06-25 UTC)

COSMOS 2550 Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 2550, 48865 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 1 day ago