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 CelesTrak

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  • Name(s): Top 10 by Minimum Range
  • Order by Minimum Range
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Data current as of 2025 Apr 26 16:05:30 UTC

Computation Interval: Start = 2025 Apr 26 16:00:00 UTC, Stop = 2025 May 03 16:00:00 UTC
Computation Threshold: 5.0 km
Considering: 11,315 Primaries, 27,276 Secondaries (80,193 Conjunctions)
19 SGP4 Propagation Errors
Computation run time: 06h 06m 32.652s

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 43762 STPSAT-5 [+] 3.517 2025-04-29 02:37:26.598 0.016 14.636
50 km All 52843 STARLINK-4188 [+] 2.679 2.078E-01 0.008
GP Data 63218 OBJECT J [+] 5.288 2025-05-01 19:00:24.782 0.016 0.000
50 km All 63219 OBJECT K [+] 5.288 1.661E-02 0.004
GP Data 49773 GLOBAL-13 [+] 3.238 2025-04-29 19:00:03.119 0.026 7.972
50 km All 62423 STARLINK-32680 [+] 4.193 1.416E-01 0.007
GP Data 52766 VARISAT 1C & CELESTIS-21 [+] 6.508 2025-05-02 15:16:46.630 0.034 10.821
50 km All 63270 STARLINK-11614 [+] 6.059 7.705E-02 0.011
GP Data 63218 OBJECT J [+] 5.307 2025-05-01 19:28:21.347 0.036 0.000
50 km All 63219 OBJECT K [+] 5.307 1.661E-02 0.004
GP Data 60268 STARLINK-32167 [+] 4.428 2025-04-30 15:01:06.208 0.047 10.242
50 km All 61781 ASRTU-1 (AO-123) [+] 4.117 4.484E-02 0.014
GP Data 56794 STARLINK-6060 [+] 5.221 2025-05-01 17:33:08.901 0.051 10.152
50 km All 18504 SL-8 DEB [-] 5.736 3.740E-02 0.016
GP Data 61735 IONOSFERA-M 1 [+] 5.309 2025-05-01 21:05:15.392 0.055 14.747
50 km All 25402 SL-16 DEB [-] 5.922 5.311E-04 0.036
GP Data 57849 STARLINK-30430 [+] 4.882 2025-04-30 19:01:26.567 0.060 11.718
50 km All 58281 AETHER-1 [+] 4.564 2.485E-02 0.021
GP Data 26958 PROBA-1 [+] 2.740 2025-04-29 05:23:33.246 0.061 12.671
50 km All 57037 OBJECT AK [+] 3.319 4.552E-04 0.023

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.