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SACI 1, 25941

Orbit data source: Space-Track

SACI 1, 25941 is a payload satellite owned by INPE (BR) in SSO that was launched on Thu, 14 Oct 1999 UTC via a CHANG ZHENG 4B launch vehicle from the Taiyaun Space Center, China (TSC). 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/25941?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/25941?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

25941, 1999-057B

Orbit

SSO

Country

BR / BRAZ

Related business

National Institute for Space Research (BR)

Manufacturer

INPE

Mission

Civil Science

Bus & Motor

SACI, Unknown motor

Mass

60 kg wet, 60 kg dry

Launch date (UTC)

1999-10-14 (27 years ago)

Launch vehicle

CHANG ZHENG 4B

Launch site

Taiyaun Space Center, China (TSC)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 4 Pan, 0.6 m

Radar Cross Section

0.500 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history
Last TLE update: 10 hours ago

TLE from 10 hours ago

0 SACI 1
1 25941U 99057B   26226.10098820  .00000182  00000-0  53548-4 0  9997
2 25941  98.6320 276.4843 0009414 118.6030 241.6114 14.54952037421064

Epoch: 2026-08-14T02:25Z

TLE epoch observation values (Epoch: 2026-08-14T02:25:25.380Z)

Latitude

-0.00004°

Longitude

-82.4025°

Altitude

715.663 km

Speed

7.496 km/s

True Right ascension

18h 25m 56s

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

03:03:52

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

713.298 km

Perigee altitude

699.959 km

Semi-major axis

7,084.766 km

Eccentricity

0.00094

Inclination

98.632°

RAAN

276.4843°

Arg. of periapsis

118.603°

True anomaly

241.51655°

Mean anomaly

241.6114°

Eccentric anomaly

241.56397°

Mean motion

3.63961 °/min

Orbital period

98.91 mins

BSTAR

0.000053548

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Other satellites on launch #57 in the year 1999 (1999-10-14 UTC)

CZ-4 DEB, 26327 (Decayed)

CZ-4 DEB, 26237 (Decayed)

CZ-4 DEB, 26270 (Decayed)

CZ-4 DEB, 35325 (Decayed)

CZ-4 DEB, 26323

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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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SACI 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.
9 mins	2026-08-14 16:11:34.019Z	17.841° NNE	2026-08-14 16:16:34.019Z	147.296° SSE	42.453°	2026-08-14 16:20:34.019Z	187.358° SSW
8 mins	2026-08-15 03:18:34.019Z	160.052° S	2026-08-15 03:21:34.019Z	135.373° SSE	43.289°	2026-08-15 03:26:34.019Z	349.097° 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 SACI 1, 25941 on other resources

View SACI 1, 25941 on NASA - NSSDCA Website

View SACI 1, 25941 on Heavens-Above

View SACI 1, 25941 on Keep Track

View SACI 1, 25941 on Celestrak

View SACI 1, 25941 on Gunter's Space Page

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

SACI 1, 25941

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 10 hours ago

TLE from 10 hours ago

TLE epoch observation values (Epoch: 2026-08-14T02:25:25.380Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #57 in the year 1999 (1999-10-14 UTC)

SACI 1 Visibility forecast

Co-orbital & Co-planar RSOs

Check out SACI 1, 25941 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 10 hours ago