ITALSAT 1, 21055
Orbit data source: Space-Track
ITALSAT 1, 21055 is a payload satellite owned by ASI (IT) in GEO that was launched on Tue, 15 Jan 1991 UTC via an ARIANE 44L 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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21055 intel report (Beta)
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Identifier
Orbit
Country
ITRelated business
Manufacturer
Alenia Spazio
Mission
Civil Communications
Bus & Motor
ITALSAT, R-4D-11
Mass
1,865 kg wet, 950 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Hex Poly + 2 Pan, 10.9 m
Radar Cross Section
28.903 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 ITALSAT 1
1 21055U 91003A 26171.18036248 .00000086 00000-0 00000-0 0 9999
2 21055 14.5485 351.4809 0013965 54.9781 140.3116 0.99963637117119Epoch: 2026-06-20T04:19Z
TLE epoch observation values (Epoch: 2026-06-20T04:19:43.318Z)
Latitude
-3.83313°
Longitude
-146.91222°
Altitude
35,918.646 km
Speed
3.068 km/s
True Right ascension
12h 25m 40s
True Declination
-3° 49' 45"
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
00:39:50
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
35,933.177 km
Perigee altitude
35,815.166 km
Semi-major axis
42,252.308 km
Eccentricity
0.0014
Inclination
14.5485°
RAAN
351.4809°
Arg. of periapsis
54.9781°
True anomaly
140.41366°
Mean anomaly
140.3116°
Eccentric anomaly
140.36264°
Mean motion
0.2499 °/min
Orbital period
1,440.57 mins
BSTAR
0
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Other satellites on launch #3 in the year 1991 (1991-01-15 UTC)
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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.ITALSAT 1 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. |
|---|---|---|---|---|---|---|---|
| 1440 mins | 2026-06-22 13:37:18.312Z | 231.425° WSW | 2026-06-22 21:52:18.312Z | 249.242° W | 31.015° | 2026-06-23 13:37:18.312Z | 232.402° WSW |
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21055 neighbors
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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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