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 CelesTrak

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  • Name(s): Top 10 by Time of Closest Approach
  • Order by Time of Closest Approach
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Data current as of 2024 Dec 09 08:06:08 UTC

Computation Interval: Start = 2024 Dec 09 08:00:00 UTC, Stop = 2024 Dec 16 08:00:00 UTC
Computation Threshold: 5.0 km
Considering: 10,657 Primaries, 26,899 Secondaries (76,189 Conjunctions)
23 SGP4 Propagation Errors
Computation run time: 06h 07m 08.462s

SOCRATES Format Documentation

See notes at bottom of page for data field descriptions

Data
&
Graphs		 NORAD
Catalog
Number		 Name [Ops Status] Days
Since
Epoch		 TCA
(UTC)		 Min
Range
(km)		 Relative
Speed
(km/sec)
Max
Probability		 Dilution
Threshold
(km)
GP Data 39453 SWARM C [+] 0.438 2024-12-09 08:00:09.082 3.404 14.226
50 km All 47487 ASTROCAST-0103 [+] 0.180 1.808E-07 1.690
GP Data 55080 FLOCK 4Y-23 [+] 0.588 2024-12-09 08:00:11.350 4.877 6.130
50 km All 61589 STARLINK-32416 [+] 0.718 4.647E-06 1.242
GP Data 57025 OBJECT X [+] 0.455 2024-12-09 08:00:12.452 4.752 14.741
50 km All 60598 STARLINK-32208 [+] 0.557 2.437E-06 2.719
GP Data 55020 FLOCK 4Y-24 [+] 0.447 2024-12-09 08:00:18.446 2.000 12.130
50 km All 59192 STARLINK-31536 [+] 0.167 1.978E-05 0.711
GP Data 47959 GRBALPHA [+] 0.199 2024-12-09 08:00:20.862 4.070 14.035
50 km All 59474 STARLINK-31581 [+] 0.673 4.043E-06 1.913
GP Data 53073 STARLINK-4346 [+] 0.236 2024-12-09 08:00:30.674 0.971 15.143
50 km All 61795 CZ-6A DEB [-] 0.334 4.792E-05 0.676
GP Data 43529 PAKTES 1A [+] 0.164 2024-12-09 08:00:31.691 3.361 15.028
50 km All 42672 CZ-4C DEB [-] 1.016 1.412E-07 2.192
GP Data 36985 TIANHUI 1 [+] 0.606 2024-12-09 08:00:32.000 3.502 14.869
50 km All 47769 STARLINK-2192 [P] 0.417 4.474E-06 2.009
GP Data 42846 CORVUS BC2 [+] 0.582 2024-12-09 08:00:37.332 4.091 0.345
50 km All 53082 STARLINK-4321 [+] 0.582 7.976E-06 0.965
GP Data 43800 ICEYE-X2 [+] 0.208 2024-12-09 08:00:47.702 4.090 13.524
50 km All 52867 STARLINK-4126 [+] 0.550 4.344E-06 1.771

10 records found

Data Fields:
  • Data: The GP Data button links to a page which provides the GP data used to generate the associated prediction.
  • NORAD Catalog Number: NORAD Catalog Numbers of the two conjuncting objects.
  • Name: SATCAT names of the two conjuncting objects. Operational status of each object is shown in brackets, using the standard CelesTrak SATCAT codes.
  • Days Since Epoch: The number of days from the epoch of the NORAD GP or SupGP (green) element set used to produce the prediction until the time of closest approach for the conjunction.
  • TCA (UTC): Time of closest approach.
  • Min Range (km): The distance between the two conjuncting objects at the time of closest approach.
  • Relative Speed (km/sec): Relative speed of the two conjuncting objects at the time of closest approach.
  • Max Probability: Given fixed spherical object radii and relative distance at the time of closest approach (TCA), the projected covariance ellipse is sized and oriented to produce the maximum probability. For these reports the ratio of major-to-minor axes of the projected covariance ellipse is set using radial, in-track, and cross-track values of 100 m, 300 m, 100 m, respectively. If the combined object radius is greater than the relative distance, the maximum probability will be one; such occurrences are not addressed here. For more details on the maximum probability method, see Dr. Sal Alfano's paper titled "Relating Position Uncertainty to Maximum Conjunction Probability".
  • Dilution Threshold (km): The standard deviation that produces the maximum probability defines the threshold of dilution. A smaller or larger standard deviation will produce a smaller probability. In the case of computing true probability with a smaller standard deviation, the data is of sufficient quality to associate low probability with low risk. For a larger standard deviation, this is not the case and the resulting true probability calculation becomes "diluted." If operating in this dilution region, the recommendation is to obtain better data and reassess the encounter. If time or resources do not permit, then the maximum probability should be used in place of the true probability.
  • SGP4 Propagation Errors: A list of objects which were not screened because their GP data shows they have already decayed (but haven't yet been reflected in the SATCAT) or will decay prior to the end of the computation interval.