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RADUGA 21, 18631

Orbit data source: Space-Track

RADUGA 21, 18631 is a payload satellite owned by UNKS (CIS) in GEO that was launched on Thu, 10 Dec 1987 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/18631?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

18631, 1987-100A

Orbit

GEO

Last TLE update

13 hours ago

Origin

Russian Space Forces (CIS)

Manufacturer

NPO PM

Mission

Non-operational Defense Communications

Bus & Motor

RADUGA, Unknown motor

Mass

1,965 kg wet, ~1,800 kg dry

Launch date (UTC)

1987-12-10 (37 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, 9.5 m

Radar Cross Section

16.975 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 13 hours ago

0 RADUGA 21
1 18631U 87100A   25133.70695748  .00000121  00000-0  00000-0 0  9999
2 18631  11.8779 328.1071 0001150 192.1564 175.0884  1.00234867137084

Epoch: 2025-05-13T16:58Z

Definitive object data (Epoch: 2025-05-13T16:58:01.126Z)

Latitude

1.50448°

Longitude

-151.01426°

Altitude

35,801.11 km

Speed

3.074 km/s

True Right ascension

22h 20m 46s

True Declination

1° 30' 11"

Sunlit

Object was in daylight at TLE epoch

Visualization TLE readout

Latitude

-4.40816°

Longitude

43.2889°

Altitude

35,792.351 km

Speed

3.075 km/s

Apparent Right ascension

10h 57m 04s

Apparent Declination

-10° 39' 46"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

14:22:54

Azimuth

235.171° WSW

Elevation

20.542°

Doppler factor

Orbital elements

Apogee altitude

35,802.802 km

Perigee altitude

35,793.101 km

Semi-major axis

42,176.088 km

Eccentricity

0.000115

Inclination

11.8779°

RAAN

328.1071°

Arg. of periapsis

192.1564°

True anomaly

175.08953°

Mean anomaly

175.0884°

Eccentric anomaly

175.08896°

Mean motion

0.25058 °/min

BSTAR

Unknown

Orbital period

1436.68 mins

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18631 neighbors

Authenticating...

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Other satellites on launch #100 in the year 1987 (1987-12-10 UTC)

SL-12 R/B(1), 18632 (Decayed)

SL-12 PLAT, 18633 (Decayed)

SL-12 R/B(2), 18634

SL-12 R/B(AUX MOTOR), 18635 (Decayed)

SL-12 R/B(AUX MOTOR), 18636 (Decayed)

SL-12 DEB *, 21620 (Decayed)

RADUGA 21 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.
1440 mins	2025-05-14 05:54:26.804Z	235.158° WSW	2025-05-14 22:50:26.804Z	248.179° W	29.018°	2025-05-15 05:54:26.804Z	235.171° WSW

Authenticating...

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Check out RADUGA 21, 18631 on other resources

View RADUGA 21, 18631 on NASA - NSSDCA Website

View RADUGA 21, 18631 on Heavens-Above

View RADUGA 21, 18631 on Keep Track

View RADUGA 21, 18631 on Celestrak

View RADUGA 21, 18631 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.