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.
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
43057 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
Edit Public Description
Identifier
Orbit
Country
ESARelated business
Manufacturer
OHB
Mission
Operational Civil Navigation
Bus & Motor
GALILEOSAT, AOCS
Mass
715 kg wet, 700 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 7.3 m
Radar Cross Section
9.223 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 23 hours ago
TLE from 23 hours ago
0 GALILEO 21 (2C7)
1 43057U 17079C 25302.41417988 .00000006 00000-0 00000-0 0 9993
2 43057 55.1458 227.8555 0003246 314.2987 45.6942 1.70473795 49053Epoch: 2025-10-29T09:56Z
TLE epoch observation values (Epoch: 2025-10-29T09:56:25.141Z)
Latitude
-0.00006°
Longitude
40.75131°
Altitude
23,215.756 km
Speed
3.671 km/s
True Right ascension
15h 11m 22s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
04:53:53
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
23,231.818 km
Perigee altitude
23,212.602 km
Semi-major axis
29,600.347 km
Eccentricity
0.00032
Inclination
55.1458°
RAAN
227.8555°
Arg. of periapsis
314.2987°
True anomaly
45.72083°
Mean anomaly
45.6942°
Eccentric anomaly
45.70751°
Mean motion
0.42618 °/min
Orbital period
844.7 mins
BSTAR
0
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #79 in the year 2017 (2017-12-12 UTC)
Did you know?
You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.GALILEO 21 (2C7) Visibility forecast
Loading observer location...
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. |
|---|---|---|---|---|---|---|---|
| 102 mins | 2025-10-30 15:29:34.804Z | 70.672° E | 2025-10-30 16:21:34.804Z | 53.147° ENE | 13.657° | 2025-10-30 17:11:34.804Z | 37.655° NE |
| 126 mins | 2025-10-31 07:12:34.804Z | 321.484° NNW | 2025-10-31 09:17:34.804Z | 288.211° WNW | 29.349° | 2025-10-31 09:18:34.804Z | 287.772° WNW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in ascending order |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in ascending order |
|---|