TUBSAT A, 21577
Orbit data source: Space-Track
TUBSAT A, 21577 is a payload satellite owned by TUB (DE) in SSO that was launched on Wed, 17 Jul 1991 UTC via an ARIANE 40 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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21577 intel report (Beta)
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Identifier
Orbit
Country
DE / GERRelated business
Manufacturer
TUB
Mission
Non-operational Amateur Communications
Bus & Motor
TUBSAT, Unknown motor
Mass
35 kg wet, 35 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Hex Poly, 1.0 m
Radar Cross Section
0.165 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 19 hours ago
TLE from 19 hours ago
0 TUBSAT A
1 21577U 91050D 26284.19705703 .00000118 00000-0 50430-4 0 9997
2 21577 98.3714 351.5647 0004961 271.0749 88.9872 14.40578369850087Epoch: 2026-10-11T04:43Z
TLE epoch observation values (Epoch: 2026-10-11T04:43:45.727Z)
Latitude
0.00003°
Longitude
-99.16913°
Altitude
759.481 km
Speed
7.475 km/s
True Right ascension
23h 26m 15s
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
18:04:28
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
757.241 km
Perigee altitude
750.165 km
Semi-major axis
7,131.84 km
Eccentricity
0.0005
Inclination
98.3714°
RAAN
351.5647°
Arg. of periapsis
271.0749°
True anomaly
89.04404°
Mean anomaly
88.9872°
Eccentric anomaly
89.01562°
Mean motion
3.60363 °/min
Orbital period
99.9 mins
BSTAR
0.00005043
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Other satellites on launch #50 in the year 1991 (1991-07-17 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.TUBSAT A 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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2026-10-12 04:11:39.381Z | 144.565° SSE | 2026-10-12 04:15:39.381Z | 66.842° ENE | 53.038° | 2026-10-12 04:19:39.381Z | 359.219° N |
| 5 mins | 2026-10-12 05:52:39.381Z | 240.754° WSW | 2026-10-12 05:54:39.381Z | 268.049° W | 16.933° | 2026-10-12 05:57:39.381Z | 305.984° NW |
| 5 mins | 2026-10-12 16:21:39.381Z | 66.416° ENE | 2026-10-12 16:23:39.381Z | 95.144° ESE | 18.115° | 2026-10-12 16:26:39.381Z | 133.329° SE |
| 7 mins | 2026-10-12 17:59:39.381Z | 352.521° N | 2026-10-12 18:02:39.381Z | 283.913° WNW | 49.529° | 2026-10-12 18:06:39.381Z | 216.968° SW |
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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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