Kayhan Space Satcat

Watchlists

Notifications
No new unread notifications...

Showing default

SKYNET 4B, 19687

Orbit data source: Space-Track

SKYNET 4B, 19687 is a payload satellite owned by UK MoD (UK) in GEO that was launched on Sun, 11 Dec 1988 UTC via an ARIANE 44LP launch vehicle from the French Guiana (FRGUI). 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/19687?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/19687?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

19687, 1988-109A

Orbit

GEO

Country

UK

Related business

Ministry of Defence, London (GB)

Manufacturer

BAe

Mission

Non-operational Defense Communications

Bus & Motor

ECS, TE-M-700-19

Mass

1,433 kg wet, 655 kg dry

Launch date (UTC)

1988-12-11 (38 years ago)

Launch vehicle

ARIANE 44LP

Launch site

French Guiana (FRGUI)

Object type

Payload

Rocket body

Debris

Shape & HBR

Hex Poly + 2 Pan, 8.0 m

Radar Cross Section

11.617 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 11 hours ago

TLE from 11 hours ago

0 SKYNET 4B
1 19687U 88109A   26305.66259580  .00000030  00000-0  00000+0 0  9996
2 19687  12.9734 335.9286 0008211 287.4143 258.0093  0.99666149119532

Epoch: 2026-11-01T15:54Z

TLE epoch observation values (Epoch: 2026-11-01T15:54:08.277Z)

Latitude

-1.20408°

Longitude

-118.36917°

Altitude

35,964.062 km

Speed

3.068 km/s

True Right ascension

10h 44m 27s

True Declination

-1° 12' 10"

Sunlit

Object was in daylight 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

22:41:25

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,992.986 km

Perigee altitude

35,923.461 km

Semi-major axis

42,336.361 km

Eccentricity

0.00082

Inclination

12.9734°

RAAN

335.9286°

Arg. of periapsis

287.4143°

True anomaly

257.91728°

Mean anomaly

258.0093°

Eccentric anomaly

257.96329°

Mean motion

0.24916 °/min

Orbital period

1,444.87 mins

BSTAR

0

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

Loading historical data...

Loading historical data...

Loading historical data...

Loading historical data...

Loading historical data...

Loading historical data...

Other satellites on launch #109 in the year 1988 (1988-12-11 UTC)

ARIANE 44LP R/B, 19689

ARIANE DEB (SPELDA), 19690 (Decayed)

ARIANE 44LP DEB, 26811 (Decayed)

ARIANE 44LP DEB, 26808

ARIANE 44LP DEB, 33542

ARIANE 44LP DEB, 26812

ARIANE 44LP DEB, 26810

ARIANE 44LP DEB, 25538

ARIANE 44LP DEB, 25541

ARIANE 44LP DEB, 33544

ARIANE 44LP DEB, 25539

ARIANE 44LP DEB, 33541

ARIANE 44LP DEB, 33546

ARIANE 44LP DEB, 33545

Did you know?

You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

Click here to try in Sandbox

SKYNET 4B Visibility forecast

Loading observer location...
Set Observer location

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	2026-11-02 02:56:16.454Z	200.002° SSW	2026-11-02 09:45:16.454Z	209.519° SW	55.253°	2026-11-03 02:56:16.454Z	202.857° SW

Items per page:

1–1 of 1 items

of 1 page

Loading historical data...

19687 neighbors

Authenticating...

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

Please sign in to view Co-orbital & Co-planar RSOs.

Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in descending order

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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 descending order

Check out SKYNET 4B, 19687 on other resources

View SKYNET 4B, 19687 on NASA - NSSDCA Website

View SKYNET 4B, 19687 on Heavens-Above

View SKYNET 4B, 19687 on Keep Track

View SKYNET 4B, 19687 on Celestrak

View SKYNET 4B, 19687 on Gunter's Space Page

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

Documentation

Go to standalone docs website

Showing up to 5 results

|