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.
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
19687 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
Edit Public Description
Identifier
Orbit
Country
UKRelated business
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)
Launch vehicle
Launch site
Object type
Shape & HBR
Hex Poly + 2 Pan, 8.0 m
Radar Cross Section
11.617 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 18 hours ago
TLE from 18 hours ago
0 SKYNET 4B
1 19687U 88109A 25250.87949986 .00000036 00000-0 00000-0 0 9990
2 19687 13.3694 338.9111 0005892 253.7230 141.8059 0.99665082115359Epoch: 2025-09-07T21:06Z
TLE epoch observation values (Epoch: 2025-09-07T21:06:28.787Z)
Latitude
7.72069°
Longitude
69.91116°
Altitude
35,976.03 km
Speed
3.067 km/s
True Right ascension
00h 54m 53s
True Declination
7° 42' 47"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
06:58:36
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
35,983.466 km
Perigee altitude
35,933.576 km
Semi-major axis
42,336.658 km
Eccentricity
0.00059
Inclination
13.3694°
RAAN
338.9111°
Arg. of periapsis
253.723°
True anomaly
141.84762°
Mean anomaly
141.8059°
Eccentric anomaly
141.82676°
Mean motion
0.24915 °/min
Orbital period
1,444.89 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)
SKYNET 4B Visibility
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. |
|---|
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
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 ascending order |
|---|
Event ID | Pc | Md | Secondary | Secondary name | Country | Click to unsort rows by TCA header |
|---|
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 |
|---|