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GALILEO 21 (2C7), 43057

Orbit data source: Space-Track

GALILEO 21 (2C7), 43057 is a payload satellite owned by GNSS Agency (ESA) that was launched on Tue, 12 Dec 2017 UTC via an ARIANE 5ES 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.

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<iframe src="https://www.satcat.com/sats-embedded/43057?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

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https://www.satcat.com/sats-embedded/43057?theme=dark&initialShowStats=false

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Identifier

43057, 2017-079C

Orbit

Active

Country

ESA

Related business

European Space Agency (FR)

Manufacturer

OHB

Mission

Operational Civil Navigation

Bus & Motor

GALILEOSAT, AOCS

Mass

715 kg wet, 700 kg dry

Launch date (UTC)

2017-12-12 (8 years ago)

Launch vehicle

ARIANE 5ES

Launch site

French Guiana (FRGUI)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 7.3 m

Radar Cross Section

9.223 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 22 hours ago

TLE from 22 hours ago

0 GALILEO 21 (2C7)
1 43057U 17079C   26070.56842350  .00000037  00000-0  00000+0 0  9990
2 43057  55.1053 224.1878 0001948 351.3112   8.6445  1.70474613 51321

Epoch: 2026-03-11T13:38Z

TLE epoch observation values (Epoch: 2026-03-11T13:38:31.790Z)

Latitude

-0.00001°

Longitude

-149.68376°

Altitude

23,216.681 km

Speed

3.67 km/s

True Right ascension

14h 56m 43s

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

15:43:29

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

23,227.883 km

Perigee altitude

23,216.351 km

Semi-major axis

29,600.254 km

Eccentricity

0.00019

Inclination

55.1053°

RAAN

224.1878°

Arg. of periapsis

351.3112°

True anomaly

8.64786°

Mean anomaly

8.6445°

Eccentric anomaly

8.64618°

Mean motion

0.42619 °/min

Orbital period

844.7 mins

BSTAR

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Other satellites on launch #79 in the year 2017 (2017-12-12 UTC)

GALILEO 20 (2C6), 43056

GALILEO 22 (2C8), 43058

GALILEO 19 (2C5), 43055

ARIANE 5 R/B, 43059

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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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GALILEO 21 (2C7) 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.
337 mins	2026-03-12 20:10:28.569Z	311.576° NW	2026-03-12 23:02:28.569Z	274.681° WNW	38.599°	2026-03-13 01:47:28.569Z	214.46° SW
257 mins	2026-03-13 07:06:28.569Z	137.757° SSE	2026-03-13 09:42:28.569Z	80.845° E	36.307°	2026-03-13 11:23:28.569Z	45.525° ENE

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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 GALILEO 21 (2C7), 43057 on other resources

View GALILEO 21 (2C7), 43057 on NASA - NSSDCA Website

View GALILEO 21 (2C7), 43057 on Heavens-Above

View GALILEO 21 (2C7), 43057 on Keep Track

View GALILEO 21 (2C7), 43057 on Celestrak

View GALILEO 21 (2C7), 43057 on Gunter's Space Page

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

GALILEO 21 (2C7), 43057

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 22 hours ago

TLE from 22 hours ago

TLE epoch observation values (Epoch: 2026-03-11T13:38:31.790Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #79 in the year 2017 (2017-12-12 UTC)

GALILEO 21 (2C7) Visibility forecast

Co-orbital & Co-planar RSOs

Check out GALILEO 21 (2C7), 43057 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 22 hours ago