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 CelesTrak

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  • Name(s): Top 10 by Minimum Range
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Data current as of 2026 Feb 09 00:05:42 UTC

Computation Interval: Start = 2026 Feb 09 00:00:00 UTC, Stop = 2026 Feb 16 00:00:00 UTC
Computation Threshold: 5.0 km
Considering: 14,368 Primaries, 29,969 Secondaries (113,700 Conjunctions)
13 SGP4 Propagation Errors
Computation run time: 09h 16m 09.083s

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 35686 APRIZESAT 3 [+] 4.773 2026-02-13 02:50:20.319 0.014 10.309
50 km All 50808 STARLINK-3355 [+] 4.987 3.479E-01 0.004
GP Data 56153 PIESAT A [+] 1.138 2026-02-09 16:51:26.604 0.017 0.001
50 km All 56156 PIESAT D [+] 1.138 1.432E-02 0.004
GP Data 63986 SCS-01 E [+] 0.404 2026-02-09 03:54:50.975 0.021 0.000
50 km All 66699 IRIDE FM5 [+] 0.338 1.024E-02 0.005
GP Data 63986 SCS-01 E [+] 0.470 2026-02-09 05:29:05.942 0.022 0.000
50 km All 66699 IRIDE FM5 [+] 0.404 1.024E-02 0.005
GP Data 63986 SCS-01 E [+] 0.341 2026-02-09 02:22:58.028 0.024 0.000
50 km All 66699 IRIDE FM5 [+] 0.275 1.024E-02 0.005
GP Data 63987 SCS-01 F [+] 0.212 2026-02-09 00:06:51.693 0.024 0.000
50 km All 66715 FLOCK 4H-12 [+] 0.277 7.582E-03 0.006
GP Data 63986 SCS-01 E [+] 0.535 2026-02-09 07:03:43.282 0.027 0.000
50 km All 66699 IRIDE FM5 [+] 0.470 1.024E-02 0.005
GP Data 58030 STARLINK-30549 [+] 0.309 2026-02-09 01:34:28.750 0.028 10.877
50 km All 63211 NUSHSAT1 [+] 0.304 1.112E-01 0.009
GP Data 62617 SCOT-1 (SCOT) [+] 4.012 2026-02-12 01:18:34.640 0.028 15.127
50 km All 13771 SL-3 R/B [-] 3.244 5.344E-03 0.019
GP Data 63986 SCS-01 E [+] 0.278 2026-02-09 00:52:34.106 0.028 0.000
50 km All 66699 IRIDE FM5 [+] 0.212 1.024E-02 0.005

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.