Key statistics
Satellite SSTL S1-4 at a glance.
Uptime
2550
Days in orbit
Revolutions
≈ 15.0
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
97.5
Latest
Satellite identification and parameters
Extended collection of information and parameters for SSTL S1-4.
Object identification
Identified? True
Debris? False
Object name: SSTL S1-4
International designator: 2018-071A
Object number (NORAD): 43618
Object ID (CCSDS): 43618
Country: UNITED KINGDOM (UK)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 96.246 minutes
Inclination: 97.5398 deg
SMA: 6956.916 km
Apoapsis: 580.294 km
Periapsis: 577.268 km
RAAN: 129.2611 deg
Eccentricy: 0.00021754
Argument of periapsis: 56.5145 deg
Mean anomaly: 303.6284 deg
Mean motion: 14.96158536 rev/day
Mean motion (dot): 0.00000595 rev/day2
B* drag term: 0.000057719053 1/REarth
Two-line elements (TLE)
Creation date: Sept. 8, 2025, 6:18 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 8, 2025, 4:01 p.m. UTC
TLE line 0: 0 SSTL S1-4
TLE line 1: 1 43618U 18071A 25251.66802613 .00000595 00000-0 57719-4 0 9998
TLE line 2: 2 43618 97.5398 129.2611 0002175 56.5145 303.6284 14.96158536380845
Live tracking on map
Real-time ground track for satellite SSTL S1-4.
In-orbit conjunctions
There are no conjunctions computed for SSTL S1-4, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
The NovaSAR-S spacecraft carries a radar imaging instrument, and the mission was developed in partnership between the British government and the British satellite manufacturer SSTL. The SSTL-S1 satellite, also built by SSTL, is a high-resolution optical Earth observation satellite identical to three DMC3/TripleSat reconnaissance craft launched in 2015. Beijing-based 21AT will lease imaging capacity on the SSTL-S1 satellite. There are also several secondary payloads.
SSTL S1-4 was lifted into orbit during the mission ‘PSLV-CA | SSTL-S1 & NovaSAR-S’, on board a PSLV space rocket.
The launch took place on Sept. 16, 2018, 4:38 p.m. from Satish Dhawan Space Centre First Launch Pad.
For more information about the launch, click the button.
PSLV-CA | SSTL-S1 & NovaSAR-S
Agency: N/A
Status: Launch Successful
Launch date: Sept. 16, 2018, 4:38 p.m. UTC
Rocket: PSLV
Launch pad: Satish Dhawan Space Centre First Launch Pad
Location: Satish Dhawan Space Centre, India
...
Latest news about this satellite
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