URGENT: We will run out of 5-digit catalog numbers at 69999 not 99999, which is estimated to occur around 2026‑07‑12 (we're currently at 69628). At that point, 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 this limitation (and finally fixed the Y2K problem) in May 2020 and immediately began providing GP data in those formats for software developers. The same limitations apply to the legacy fixed-field SATCAT. Follow @TSKelso on Bluesky for the latest updates, tutorials, and changes as we approach this transition. 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 Jun 17 10:30:47 UTC

Computation Interval: Start = 2026 Jun 17 12:00:00 UTC, Stop = 2026 Jun 24 12:00:00 UTC
Computation Threshold: 5.0 km
Considering: 15,750 Primaries, 31,618 Secondaries (146,865 Conjunctions)
25 SGP4 Propagation Errors
Computation run time: 11h 11m 49.483s

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 45366 STARLINK-1262 [P] 4.285 2026-06-21 07:14:38.521 0.031 6.756
50 km All 65430 STARLINK-35025 [+] 4.148 2.632E-01 0.009
GP Data 55598 STARLINK-5756 [P] 6.097 2026-06-22 18:09:37.442 0.062 0.308
50 km All 64015 STARLINK-34093 [+] 6.097 9.532E-02 0.016
GP Data 38358 NUSTAR [+] 1.959 2026-06-19 05:00:23.712 0.034 7.114
50 km All 49430 STARLINK-3138 [+] 2.021 8.938E-02 0.009
GP Data 56812 STARLINK-6065 [+] 1.967 2026-06-19 01:02:09.423 0.036 3.713
50 km All 63248 LEMUR-2-LIA-MARTIN [+] 2.102 8.410E-02 0.009
GP Data 45390 STARLINK-1284 [P] 1.537 2026-06-18 09:12:58.272 0.075 4.995
50 km All 63006 STARLINK-11553 [+] 2.241 6.642E-02 0.019
GP Data 45366 STARLINK-1262 [P] 2.666 2026-06-19 16:23:27.888 0.065 11.932
50 km All 60152 STARLINK-32147 [+] 2.837 6.581E-02 0.023
GP Data 65419 STARLINK-35085 [+] 3.466 2026-06-20 12:46:38.153 0.048 4.735
50 km All 13771 SL-3 R/B [-] 3.328 6.324E-02 0.012
GP Data 57908 STARLINK-30464 [P] 4.535 2026-06-21 16:35:03.394 0.082 7.634
50 km All 59693 STARLINK-32088 [+] 4.848 5.349E-02 0.022
GP Data 57926 STARLINK-30468 [P] 3.223 2026-06-20 09:24:28.133 0.100 3.910
50 km All 63118 STARLINK-32945 [+] 3.675 3.986E-02 0.025
GP Data 54809 STARLINK-5414 [+] 4.140 2026-06-21 07:22:00.442 0.039 14.354
50 km All 68435 ION SCV-019 (ASTOUNDING ALEXANDRA) [+] 4.176 3.859E-02 0.020

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.