OBJECT K, 63991

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 K, 63991 is a Chinese satellite in SSO that was launched on Wed, 14 May 2025 UTC via a CHANG ZHENG 2D launch vehicle from the Jiuquan Satellite Launch Center, China (JSC). 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/63991?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/63991?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

63991, 2025-100K

Orbit

SSO

Country

CN / PRC

Related business

None

Manufacturer

Unknown

Mission

Operational Commercial Technology

Bus & Motor

Unknown

Mass

Unknown

Launch date (UTC)

2025-05-14 (1 year ago)

Launch vehicle

CHANG ZHENG 2D

Launch site

Jiuquan Satellite Launch Center, China (JSC)

Object type

Unknown

Shape & HBR

Box + 2 Pan, 1.0 m

Radar Cross Section

0.135 m², Medium (>0.1 m² and < 1m²)

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Last TLE update: 8 hours ago

TLE from 8 hours ago

0 OBJECT K
1 63991U 25100K   26130.14438551  .00010779  00000-0  48754-3 0  9994
2 63991  97.3638 203.8165 0013188  98.4840 261.7891 15.21016649 54845

Epoch: 2026-05-10T03:27Z

TLE epoch observation values (Epoch: 2026-05-10T03:27:54.908Z)

Latitude

-0°

Longitude

-76.11397°

Altitude

507.174 km

Speed

7.61 km/s

True Right ascension

13h 35m 15s

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

19:53:07

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

508.806 km

Perigee altitude

490.665 km

Semi-major axis

6,877.872 km

Eccentricity

0.00132

Inclination

97.3638°

RAAN

203.8165°

Arg. of periapsis

98.484°

True anomaly

261.63956°

Mean anomaly

261.7891°

Eccentric anomaly

261.71433°

Mean motion

3.80506 °/min

Orbital period

94.61 mins

BSTAR

0.00048754

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Other satellites on launch #100 in the year 2025 (2025-05-14 UTC)

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OBJECT K 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	2026-05-10 18:15:26.361Z	332.052° NNW	2026-05-10 18:16:26.361Z	302.39° NW	30.036°	2026-05-10 18:19:26.361Z	224.667° SW
5 mins	2026-05-11 04:52:26.361Z	159.137° S	2026-05-11 04:54:26.361Z	42.109° NE	43.995°	2026-05-11 04:57:26.361Z	351.593° 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 OBJECT K, 63991 on other resources

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View OBJECT K, 63991 on Keep Track

View OBJECT K, 63991 on Celestrak

View OBJECT K, 63991 on Gunter's Space Page

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

OBJECT K, 63991

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 8 hours ago

TLE from 8 hours ago

TLE epoch observation values (Epoch: 2026-05-10T03:27:54.908Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #100 in the year 2025 (2025-05-14 UTC)

OBJECT K Visibility forecast

Co-orbital & Co-planar RSOs

Check out OBJECT K, 63991 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 8 hours ago