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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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<iframe src="https://www.satcat.com/sats-embedded/21577?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/21577?theme=dark&initialShowStats=false

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Identifier

21577, 1991-050D

Orbit

SSO

Country

DE / GER

Related business

Technical University of Berlin (DE)

Manufacturer

TUB

Mission

Non-operational Amateur Communications

Bus & Motor

TUBSAT, Unknown motor

Mass

35 kg wet, 35 kg dry

Launch date (UTC)

1991-07-17 (35 years ago)

Launch vehicle

ARIANE 40

Launch site

French Guiana (FRGUI)

Object type

Payload

Rocket body

Debris

Shape & HBR

Hex Poly, 1.0 m

Radar Cross Section

0.165 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history
Last TLE update: 2 days ago

TLE from 2 days ago

0 TUBSAT A
1 21577U 91050D   26171.18978179  .00000086  00000-0  40520-4 0  9993
2 21577  98.3829 240.8947 0005047 245.9140 114.1521 14.40551095833810

Epoch: 2026-06-20T04:33Z

TLE epoch observation values (Epoch: 2026-06-20T04:33:17.146Z)

Latitude

-0.00005°

Longitude

-95.8347°

Altitude

761.106 km

Speed

7.473 km/s

True Right ascension

16h 03m 34s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

00:29:11

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

757.393 km

Perigee altitude

750.194 km

Semi-major axis

7,131.931 km

Eccentricity

0.0005

Inclination

98.3829°

RAAN

240.8947°

Arg. of periapsis

245.914°

True anomaly

114.20486°

Mean anomaly

114.1521°

Eccentric anomaly

114.17848°

Mean motion

3.60357 °/min

Orbital period

99.9 mins

BSTAR

0.00004052

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Other satellites on launch #50 in the year 1991 (1991-07-17 UTC)

SARA DEB, 29501 (Decayed)

ERS 1 DEB, 35259

SARA DEB, 28844 (Decayed)

ERS 1 DEB, 35261 (Decayed)

ERS 1 DEB, 35258 (Decayed)

ERS 1 DEB, 42669 (Decayed)

ERS 1 DEB, 35260

ERS 1 DEB, 48172 (Decayed)

OSCAR 22 (UOSAT 5), 21575

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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.
9 mins	2026-06-22 17:08:40.747Z	25.721° NE	2026-06-22 17:12:40.747Z	84.286° E	37.211°	2026-06-22 17:17:40.747Z	174.903° S
5 mins	2026-06-22 18:49:40.747Z	322.195° NNW	2026-06-22 18:51:40.747Z	292.633° NW	17.938°	2026-06-22 18:54:40.747Z	254.338° W
8 mins	2026-06-23 04:21:40.747Z	150.828° SSE	2026-06-23 04:25:40.747Z	66.525° ENE	41.605°	2026-06-23 04:29:40.747Z	355.613° N

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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 TUBSAT A, 21577 on other resources

View TUBSAT A, 21577 on NASA - NSSDCA Website

View TUBSAT A, 21577 on Heavens-Above

View TUBSAT A, 21577 on Keep Track

View TUBSAT A, 21577 on Celestrak

View TUBSAT A, 21577 on Gunter's Space Page

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

TUBSAT A, 21577

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 days ago

TLE from 2 days ago

TLE epoch observation values (Epoch: 2026-06-20T04:33:17.146Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #50 in the year 1991 (1991-07-17 UTC)

TUBSAT A Visibility forecast

Co-orbital & Co-planar RSOs

Check out TUBSAT A, 21577 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 days ago