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SZ-21 MODULE, 66515

Orbit data source: Space-Track

SZ-21 MODULE, 66515 is a payload satellite owned by ZZHGB (CN) in LEO that was launched on Fri, 31 Oct 2025 UTC launched from the Jiuquan Satellite Launch Center, China (JSC). 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/66515?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/66515?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

66515, 2025-246C

Orbit

LEO

Country

CN / PRC

Related business

China Manned Space Agency (CN)

Manufacturer

CAST

Mission

Civil Spaceship

Bus & Motor

SHENZHOU OM, Unknown motor

Mass

~1,842 kg wet, ~1,500 kg dry

Launch date (UTC)

2025-10-31 (4 months ago)

Launch vehicle

Unknown

Launch site

Jiuquan Satellite Launch Center, China (JSC)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl + 2 Pan, 14.5 m

Radar Cross Section

9.277 m²

Expand to show TLE details & history
Last TLE update: 14 hours ago

TLE from 14 hours ago

0 SZ-21 MODULE
1 66515U 25246C   26061.55898934  .00039531  00000-0  34908-3 0  9996
2 66515  41.4734 247.2373 0001469 286.7563  73.3117 15.67907744 16956

Epoch: 2026-03-02T13:24Z

TLE epoch observation values (Epoch: 2026-03-02T13:24:56.678Z)

Latitude

-0.00005°

Longitude

-114.34959°

Altitude

364.204 km

Speed

7.693 km/s

True Right ascension

16h 28m 56s

True Declination

0° 00' 00"

Sunlit

Object was in daylight 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

07:10:42

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

368.119 km

Perigee altitude

366.137 km

Semi-major axis

6,745.265 km

Eccentricity

0.00015

Inclination

41.4734°

RAAN

247.2373°

Arg. of periapsis

286.7563°

True anomaly

73.32783°

Mean anomaly

73.3117°

Eccentric anomaly

73.31976°

Mean motion

3.91782 °/min

Orbital period

91.89 mins

BSTAR

0.00034908

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Other satellites on launch #246 in the year 2025 (2025-10-31 UTC)

SZ-21, 66263 (Decayed)

CZ-2F R/B, 66264 (Decayed)

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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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SZ-21 MODULE 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.
4 mins	2026-03-03 15:37:28.163Z	212.786° SW	2026-03-03 15:39:28.163Z	162.643° S	26.393°	2026-03-03 15:41:28.163Z	100.352° ESE
4 mins	2026-03-03 17:14:28.163Z	266.517° W	2026-03-03 17:15:28.163Z	280.997° WNW	40.602°	2026-03-03 17:18:28.163Z	76.242° E
4 mins	2026-03-03 18:50:28.163Z	285.695° WNW	2026-03-03 18:52:28.163Z	12.107° NNE	42.975°	2026-03-03 18:54:28.163Z	88.287° E
4 mins	2026-03-03 20:27:28.163Z	257.595° W	2026-03-03 20:28:28.163Z	221.282° SW	32.236°	2026-03-03 20:31:28.163Z	132.359° SE

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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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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

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out SZ-21 MODULE, 66515 on other resources

View SZ-21 MODULE, 66515 on NASA - NSSDCA Website

View SZ-21 MODULE, 66515 on Heavens-Above

View SZ-21 MODULE, 66515 on Keep Track

View SZ-21 MODULE, 66515 on Celestrak

View SZ-21 MODULE, 66515 on Gunter's Space Page

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

SZ-21 MODULE, 66515

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-03-02T13:24:56.678Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #246 in the year 2025 (2025-10-31 UTC)

SZ-21 MODULE Visibility forecast

Co-orbital & Co-planar RSOs

Check out SZ-21 MODULE, 66515 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 14 hours ago