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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.

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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 spacecraft

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

Unknown

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 16 hours ago

TLE from 16 hours ago

0 SKYNET 4B
1 19687U 88109A   25340.28553708  .00000056  00000-0  00000-0 0  9990
2 19687  13.2846 338.2788 0008921 282.9890 153.8372  0.99666949116245

Epoch: 2025-12-06T06:51Z

TLE epoch observation values (Epoch: 2025-12-06T06:51:10.403Z)

Latitude

12.95641°

Longitude

-123.3173°

Altitude

35,990.038 km

Speed

3.066 km/s

True Right ascension

03h 39m 09s

True Declination

12° 56' 38"

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

21:22:29

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,995.761 km

Perigee altitude

35,920.225 km

Semi-major axis

42,336.13 km

Eccentricity

0.00089

Inclination

13.2846°

RAAN

338.2788°

Arg. of periapsis

282.989°

True anomaly

153.88223°

Mean anomaly

153.8372°

Eccentric anomaly

153.85972°

Mean motion

0.24916 °/min

Orbital period

1,444.86 mins

BSTAR

0

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

ARIANE DEB (SPELDA), 19690 (Decayed)

ARIANE 44LP DEB, 25541

ARIANE 44LP DEB, 26812

ARIANE 44LP DEB, 33547

ARIANE 44LP DEB, 25543

ARIANE 44LP DEB, 33541

ARIANE 44LP DEB, 33543

ARIANE 44LP R/B, 19689

ARIANE 44LP DEB, 26810

ARIANE 44LP DEB, 25539

ARIANE 44LP DEB, 25538

ARIANE 44LP DEB, 33546

ARIANE 44LP DEB, 26808

ARIANE 44LP DEB, 33544

ARIANE 44LP DEB, 33542

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

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SKYNET 4B 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.
1440 mins	2025-12-06 23:18:59.872Z	204.02° SW	2025-12-07 08:02:59.872Z	219.139° SW	38.554°	2025-12-07 23:18:59.872Z	206.526° SW

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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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