Showing default

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.

Loading next visibility...

Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/18631?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/18631?theme=dark&initialShowStats=false

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

ISO8601 Format

Identifier

18631, 1987-100A

Orbit

GEO

Last TLE update

6 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 (38 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 6 hours ago

0 RADUGA 21
1 18631U 87100A   25186.53853473  .00000123  00000-0  00000-0 0  9991
2 18631  11.8016 327.7191 0001603 202.1168 152.0827  1.00258491137600

Epoch: 2025-07-05T12:55Z

TLE epoch observation values (Epoch: 2025-07-05T12:55:29.4Z)

Latitude

-1.19141°

Longitude

-155.60717°

Altitude

35,795.978 km

Speed

3.074 km/s

True Right ascension

21h 28m 09s

True Declination

-1° 11' 25"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

11.55577°

Longitude

-72.35725°

Altitude

35,792.945 km

Speed

3.074 km/s

Apparent Right ascension

02h 38m 26s

Apparent Declination

6° 29' 15"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

06:24:45

Azimuth

252.31° W

Elevation

29.488°

Doppler factor

Orbital elements

Apogee altitude

35,798.087 km

Perigee altitude

35,784.567 km

Semi-major axis

42,169.464 km

Eccentricity

0.00016

Inclination

11.8016°

RAAN

327.7191°

Arg. of periapsis

202.1168°

True anomaly

Unknown

Mean anomaly

152.0827°

Eccentric anomaly

Unknown

Mean motion

0.25064 °/min

Orbital period

1,436.34 mins

BSTAR

Loading historical data...

18631 neighbors

Authenticating...

Loading maneuver chart data...

Loading SW <> Apogee altitude chart data...

Loading historical data...

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	2025-07-05 18:29:13.129Z	252.293° W	2025-07-05 19:46:13.129Z	252.129° W	26.515°	2025-07-06 18:29:13.129Z	252.356° W

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in ascending order

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.