OBJECT E, 63523

Orbit data source: Space-Track

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Recently launched and/or uncataloged satellites may have evolving metadata. Metadata may include but not limited to: Owner, Maufacturer, Bus, Motor, and Mission.

OBJECT E, 63523 is a satellite owned by Tsinghua (CN) in LEO that was launched on Thu, 29 Apr 2021 UTC via a CHANG ZHENG 7 launch vehicle from the Wenchang Satellite Launch Center (WSC). Unknown objects in Earth's orbit typically refer to objects detected orbiting the Earth but have not yet been identified or cataloged. These objects could be anything from previously untracked satellites, spent rocket stages, debris from satellite collisions, or even natural meteoroids temporarily captured by Earth's gravity.

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<iframe src="https://www.satcat.com/sats-embedded/63523?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/63523?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

63523, 2021-035E

Orbit

LEO

Country

CN / PRC

Related business

Tsinghua University (CN)

Manufacturer

Tsinghua

Mission

Amateur Imaging

Bus & Motor

NAXING, Unknown motor

Mass

20 kg wet, 20 kg dry

Launch date (UTC)

2021-04-29 (5 years ago)

Launch vehicle

CHANG ZHENG 7

Launch site

Wenchang Satellite Launch Center (WSC)

Object type

Unknown

Shape & HBR

Box, 0.4 m

Radar Cross Section

0.240 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 OBJECT E
1 63523U 21035E   26141.25633056  .00052439  00000-0  43578-3 0  9997
2 63523  41.4554  92.2392 0001857  66.8421 293.2616 15.69289879 64169

Epoch: 2026-05-21T06:09Z

TLE epoch observation values (Epoch: 2026-05-21T06:09:06.960Z)

Latitude

-0.00003°

Longitude

121.05603°

Altitude

360.032 km

Speed

7.696 km/s

True Right ascension

06h 08m 57s

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

01:04:36

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

364.425 km

Perigee altitude

361.921 km

Semi-major axis

6,741.31 km

Eccentricity

0.00019

Inclination

41.4554°

RAAN

92.2392°

Arg. of periapsis

66.8421°

True anomaly

293.24205°

Mean anomaly

293.2616°

Eccentric anomaly

293.25182°

Mean motion

3.92127 °/min

Orbital period

91.81 mins

BSTAR

0.00043578

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Other satellites on launch #35 in the year 2021 (2021-04-29 UTC)

CSS (TIANHE-1), 48274

CZ-5B R/B, 48275 (Decayed)

OBJECT D, 62300 (Decayed)

XW-4 (CAS-10), 54816 (Decayed)

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OBJECT E 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.
5 mins	2026-05-22 00:42:49.707Z	234.234° WSW	2026-05-22 00:45:49.707Z	144.838° SSE	36.231°	2026-05-22 00:47:49.707Z	87.123° E
4 mins	2026-05-22 02:20:49.707Z	283.544° WNW	2026-05-22 02:21:49.707Z	338.941° N	42.032°	2026-05-22 02:24:49.707Z	78.401° E
4 mins	2026-05-22 03:56:49.707Z	284.316° WNW	2026-05-22 03:58:49.707Z	94.672° ESE	40.586°	2026-05-22 04:00:49.707Z	101.109° ESE

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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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View OBJECT E, 63523 on Gunter's Space Page

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OBJECT E, 63523

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: 2026-05-21T06:09:06.960Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #35 in the year 2021 (2021-04-29 UTC)

OBJECT E Visibility forecast

Co-orbital & Co-planar RSOs

Check out OBJECT E, 63523 on other resources

Documentation

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