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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.

Not visible in the next 10 days

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

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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 (37 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: 1 day ago

TLE from 1 day ago

0 SKYNET 4B
1 19687U 88109A   25256.87789838  .00000086  00000-0  00000-0 0  9999
2 19687  13.3640 338.8673 0006129 254.2387 133.5666  0.99666293115419

Epoch: 2025-09-13T21:04Z

TLE epoch observation values (Epoch: 2025-09-13T21:04:10.42Z)

Latitude

6.19631°

Longitude

56.91972°

Altitude

35,974.083 km

Speed

3.067 km/s

True Right ascension

00h 24m 16s

True Declination

6° 11' 24"

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

23:29:07

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,984.126 km

Perigee altitude

35,932.23 km

Semi-major axis

42,336.315 km

Eccentricity

0.00061

Inclination

13.364°

RAAN

338.8673°

Arg. of periapsis

254.2387°

True anomaly

133.61746°

Mean anomaly

133.5666°

Eccentric anomaly

133.59203°

Mean motion

0.24916 °/min

Orbital period

1,444.87 mins

BSTAR

0

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

ASTRA 1A, 19688

ARIANE 44LP R/B, 19689

ARIANE DEB (SPELDA), 19690 (Decayed)

ARIANE 44LP DEB, 25538

ARIANE 44LP DEB, 25539

ARIANE 44LP DEB, 25540

ARIANE 44LP DEB, 25541

ARIANE 44LP DEB, 25542

ARIANE 44LP DEB, 25543

ARIANE 44LP DEB, 26808

ARIANE 44LP DEB, 26810

ARIANE 44LP DEB, 26811 (Decayed)

ARIANE 44LP DEB, 26812

ARIANE 44LP DEB, 33541

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

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19687 neighbors

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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 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

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