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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 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: 21 hours ago

TLE from 21 hours ago

0 SSTL S1-4
1 43618U 18071A   26172.56915878  .00000314  00000-0  32729-4 0  9991
2 43618  97.5014  44.0005 0001333 116.5212 243.6147 14.96182009423591

Epoch: 2026-06-21T13:39Z

TLE epoch observation values (Epoch: 2026-06-21T13:39:35.318Z)

Latitude

-0°

Longitude

-70.66421°

Altitude

582.174 km

Speed

7.569 km/s

True Right ascension

02h 56m 00s

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

21:40:27

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

576.635 km

Perigee altitude

574.781 km

Semi-major axis

6,953.845 km

Eccentricity

0.00013

Inclination

97.5014°

RAAN

44.0005°

Arg. of periapsis

116.5212°

True anomaly

243.60102°

Mean anomaly

243.6147°

Eccentric anomaly

243.60786°

Mean motion

3.74288 °/min

Orbital period

96.18 mins

BSTAR

0.000032729

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

NOVASAR 1, 43619

PSLV R/B, 43620

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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	2026-06-22 15:27:25.257Z	166.059° S	2026-06-22 15:31:25.257Z	359.609° N	44.679°	2026-06-22 15:34:25.257Z	348.482° N
6 mins	2026-06-23 04:45:25.257Z	349.626° N	2026-06-23 04:47:25.257Z	307.652° NW	33.589°	2026-06-23 04:51:25.257Z	216.644° SW

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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: 21 hours ago

TLE from 21 hours ago

TLE epoch observation values (Epoch: 2026-06-21T13:39:35.318Z)

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: 21 hours ago