URGENT: We ran out of 5-digit catalog numbers with the addition of Saramago on 2026-07-11. We had estimated that to occur around 2026‑07‑12 back on 2026-05-09. The official USSF SATCAT is now at 100100. All newly cataloged objects will have 6-digit catalog numbers of 100000+ and GP data will not be available for them using the TLE format. CelesTrak developed new formats that removed the 5-digit catalog number limitation (and finally fixed the Y2K problem) in May 2020 and immediately began providing GP data in those formats for software developers. Please be sure to adhere to our usage policy when retrieving any CelesTrak data. The same limitations apply to the legacy fixed-field SATCAT. That legacy format will continue to update but will only contain data for objects with catalog numbers below 70000. Be sure to follow @TSKelso on Bluesky for the latest updates, tutorials, and changes as we move forward. Spread the word! ‑ TS

SOCRATES Plus

Search Results

 CelesTrak

Search parameters:

  • Name(s): Top 10 by Maximum Probability
  • Order by Maximum Probability
  • Return first 10 items

Data current as of 2026 Jul 21 14:13:27 UTC

Computation Interval: Start = 2026 Jul 21 14:00:00 UTC, Stop = 2026 Jul 28 14:00:00 UTC
Computation Threshold: 5.0 km
Considering: 16,135 Primaries, 32,080 Secondaries (149,257 Conjunctions)
29 SGP4 Propagation Errors
Computation run time: 12h 00m 20.510s

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 57924 STARLINK-30487 [P] 2.345 2026-07-22 21:14:33.532 0.032 7.877
50 km All 58476 STARLINK-30980 [+] 2.003 2.503E-01 0.009
GP Data 65401 STARLINK-34909 [+] 3.511 2026-07-24 15:58:39.034 0.021 9.644
50 km All 20666 SL-6 R/B(2) [-] 3.510 2.282E-01 0.006
GP Data 59798 STARLINK-31687 [+] 7.184 2026-07-27 19:42:31.831 0.020 13.859
50 km All 67291 QMR-KWT-2 (RS95S) [+] 6.787 1.596E-01 0.009
GP Data 54062 STARLINK-5170 [+] 1.130 2026-07-22 09:06:50.640 0.021 14.725
50 km All 67266 SITRO-AIS-65 [+] 1.379 1.243E-01 0.011
GP Data 54823 STARLINK-5106 [P] 3.535 2026-07-24 16:00:51.998 0.049 9.931
50 km All 66489 STARLINK-35696 [+] 4.017 1.224E-01 0.015
GP Data 46706 STARLINK-1807 [P] 4.282 2026-07-24 22:38:02.817 0.063 2.872
50 km All 67874 STARLINK-36730 [+] 3.958 9.335E-02 0.016
GP Data 44408 MOMENTUS-X1 [+] 0.986 2026-07-22 02:39:50.529 0.035 5.990
50 km All 59762 STARLINK-11110 [+] 1.684 8.804E-02 0.009
GP Data 53204 STARLINK-4410 [P] 1.677 2026-07-22 22:14:50.344 0.052 14.639
50 km All 61546 STARLINK-32445 [+] 1.653 6.906E-02 0.028
GP Data 53201 STARLINK-4405 [P] 4.243 2026-07-25 11:50:04.513 0.069 13.130
50 km All 53574 STARLINK-4559 [+] 4.285 5.233E-02 0.028
GP Data 53481 STARLINK-4302 [P] 2.498 2026-07-23 17:57:05.445 0.064 14.019
50 km All 66106 STARLINK-35584 [+] 2.594 5.195E-02 0.030

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.