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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). Payloads include a variety of satellites, spacecraft, and rockets 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

Identifier	19687, 1988-109A
Orbit	GEO
Last TLE update	18 hours ago
Origin	UK MoD (UK)
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 (36 years ago)
Launch vehicle	ARIANE 44LP
Launch site	French Guiana (FRGUI)
Object type	Payload Rocket body Debris
Shape & HBR	Hex Poly + 2 Pan, 16 m
Radar Cross Section	11.617 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 18 hours ago

0 SKYNET 4B
1 19687U 88109A   25070.70514823 -.00000217  00000-0  00000-0 0  9992
2 19687  13.5396 340.2215 0005656 302.7308 241.1245  0.99667887113556

Epoch: 2025-03-11T16:55Z

Definitive object data (Epoch: 2025-03-11T16:55:24.807Z)

Latitude	-0.88934°
Longitude	100.49131°
Altitude	35,968.029 km
Speed	3.068 km/s
True Right ascension	10h 55m 47s
True Declination	0° 53' 18"
Sunlit	Object was in daylight at TLE epoch

Visualization TLE readout

Latitude	13.34061°
Longitude	16.80333°
Altitude	35,977.691 km
Speed	3.067 km/s
Apparent Right ascension	05h 10m 54s
Apparent Declination	7° 05' 51"
Sunlit	Object is in daylight

Visualization observer readout

Local Sidereal Time	15:43:28
Azimuth	331.69° NNW
Elevation	-38.838°
Doppler factor	1

Orbital elements

Apogee altitude	35,981.67 km
Perigee altitude	35,933.779 km
Semi-major axis	42,335.861 km
Eccentricity	0.0005656
Inclination	13.5396°
RAAN	340.2215°
Arg. of periapsis	302.7308°
True anomaly	241.06776°
Mean anomaly	241.1245°
Eccentric anomaly	241.09613°
Mean motion	0.24916 °/min
BSTAR	Unknown
Orbital period	1444.85 mins