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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 (8 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: 12 hours ago

TLE from 12 hours ago

0 SSTL S1-4
1 43618U 18071A   26261.43937997  .00000584  00000-0  54659-4 0  9997
2 43618  97.4857 129.1235 0004501 238.6925 121.3858 14.97614855436889

Epoch: 2026-09-18T10:32Z

TLE epoch observation values (Epoch: 2026-09-18T10:32:42.429Z)

Latitude

0.00004°

Longitude

-26.41554°

Altitude

578.957 km

Speed

7.57 km/s

True Right ascension

08h 36m 29s

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

15:11:20

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

574.395 km

Perigee altitude

568.14 km

Semi-major axis

6,949.404 km

Eccentricity

0.00045

Inclination

97.4857°

RAAN

129.1235°

Arg. of periapsis

238.6925°

True anomaly

121.42982°

Mean anomaly

121.3858°

Eccentric anomaly

121.40781°

Mean motion

3.74647 °/min

Orbital period

96.09 mins

BSTAR

0.000054659

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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.
4 mins	2026-09-19 03:10:26.033Z	57.092° ENE	2026-09-19 03:12:26.033Z	89.887° E	17.656°	2026-09-19 03:14:26.033Z	124.611° SE
6 mins	2026-09-19 04:45:26.033Z	343.016° N	2026-09-19 04:47:26.033Z	303.565° NW	32.537°	2026-09-19 04:51:26.033Z	224.769° SW
6 mins	2026-09-19 15:32:26.033Z	182.328° SSW	2026-09-19 15:35:26.033Z	283.98° WNW	60.461°	2026-09-19 15:38:26.033Z	339.008° N

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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: 12 hours ago

TLE from 12 hours ago

TLE epoch observation values (Epoch: 2026-09-18T10:32:42.429Z)

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: 12 hours ago