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SSTL S1-4, 43618

Orbit data source: Space-Track

SSTL S1-4, 43618 is a payload satellite owned by SSTL (Astrium) (UK) in SSO that was launched on Sun, 16 Sep 2018 UTC via a PSLV launch vehicle from the Sirharikota (SRI). 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 src="https://www.satcat.com/sats-embedded/43618?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/43618?theme=dark&initialShowStats=false

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Identifier

43618, 2018-071A

Orbit

SSO

Country

Related business

Airbus Defense and Space (FR)

Manufacturer

SSTL (Astrium)

Mission

Operational Commercial Imaging

Bus & Motor

SSTL-300S1, Unknown motor

Mass

444 kg wet, 400 kg dry

Launch date (UTC)

2018-09-16 (7 years ago)

Launch vehicle

PSLV

Launch site

Sirharikota (SRI)

Object type

Payload

Rocket body

Debris

Shape & HBR

Hept Cone + Cyl, 1.3 m

Radar Cross Section

2.356 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 7 hours ago

TLE from 7 hours ago

0 SSTL S1-4
1 43618U 18071A   25342.62191076  .00002357  00000-0  21391-3 0  9993
2 43618  97.5281 216.8031 0002833  81.1995 278.9547 14.96204595394447

Epoch: 2025-12-08T14:55Z

TLE epoch observation values (Epoch: 2025-12-08T14:55:33.089Z)

Latitude

-0.00009°

Longitude

-84.70306°

Altitude

581.385 km

Speed

7.57 km/s

True Right ascension

14h 27m 12s

True Declination

0° 00' 00"

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

20:05:26

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

577.609 km

Perigee altitude

573.669 km

Semi-major axis

6,953.776 km

Eccentricity

0.00028

Inclination

97.5281°

RAAN

216.8031°

Arg. of periapsis

81.1995°

True anomaly

278.92263°

Mean anomaly

278.9547°

Eccentric anomaly

278.93867°

Mean motion

3.74293 °/min

Orbital period

96.18 mins

BSTAR

0.00021391

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Other satellites on launch #71 in the year 2018 (2018-09-16 UTC)

PSLV R/B, 43620

NOVASAR 1, 43619

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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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SSTL S1-4 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.
7 mins	2025-12-09 04:20:18.013Z	25.675° NE	2025-12-09 04:23:18.013Z	88.885° E	38.119°	2025-12-09 04:27:18.013Z	176.453° S
5 mins	2025-12-09 15:09:18.013Z	117.653° SE	2025-12-09 15:11:18.013Z	74.364° E	26.218°	2025-12-09 15:14:18.013Z	15.501° NNE
4 mins	2025-12-09 16:45:18.013Z	238.188° WSW	2025-12-09 16:46:18.013Z	256.76° W	18.608°	2025-12-09 16:49:18.013Z	309.151° NW

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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 SSTL S1-4, 43618 on other resources

View SSTL S1-4, 43618 on NASA - NSSDCA Website

View SSTL S1-4, 43618 on Heavens-Above

View SSTL S1-4, 43618 on Keep Track

View SSTL S1-4, 43618 on Celestrak

View SSTL S1-4, 43618 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

SSTL S1-4, 43618

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 7 hours ago

TLE from 7 hours ago

TLE epoch observation values (Epoch: 2025-12-08T14:55:33.089Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #71 in the year 2018 (2018-09-16 UTC)

SSTL S1-4 Visibility forecast

Co-orbital & Co-planar RSOs

Check out SSTL S1-4, 43618 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 7 hours ago