OBJECT K, 63991
Orbit data source: Space-Track
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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63991 intel report (Beta)
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Identifier
Orbit
Country
CN / PRCRelated business
None
Manufacturer
Unknown
Mission
Operational Commercial Technology
Bus & Motor
Unknown
Mass
Unknown
Launch date (UTC)
Launch vehicle
Launch site
Object type
Unknown
Shape & HBR
Box + 2 Pan, 1.0 m
Radar Cross Section
0.135 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 14 hours ago
TLE from 14 hours ago
0 OBJECT K
1 63991U 25100K 26202.60880054 .00011680 00000-0 53273-3 0 9998
2 63991 97.3616 274.5901 0010138 185.8827 174.2291 15.20740315 65850Epoch: 2026-07-21T14:36Z
TLE epoch observation values (Epoch: 2026-07-21T14:36:40.366Z)
Latitude
-0.00006°
Longitude
116.04587°
Altitude
513.642 km
Speed
7.603 km/s
True Right ascension
18h 18m 21s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
17:32:20
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
507.543 km
Perigee altitude
493.596 km
Semi-major axis
6,878.706 km
Eccentricity
0.00101
Inclination
97.3616°
RAAN
274.5901°
Arg. of periapsis
185.8827°
True anomaly
174.24077°
Mean anomaly
174.2291°
Eccentric anomaly
174.23493°
Mean motion
3.80437 °/min
Orbital period
94.63 mins
BSTAR
0.00053273
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Other satellites on launch #100 in the year 2025 (2025-05-14 UTC)
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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.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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2026-07-22 04:57:01.131Z | 170.904° S | 2026-07-22 05:00:01.131Z | 266.419° W | 44.657° | 2026-07-22 05:03:01.131Z | 345.445° N |
| 5 mins | 2026-07-22 18:02:01.131Z | 350.914° N | 2026-07-22 18:04:01.131Z | 282.177° WNW | 37.548° | 2026-07-22 18:07:01.131Z | 211.575° SW |
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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