SOCRATES

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Search parameters:

  • Name(s): Top 10 by Minimum Range
  • Order by Minimum Range
  • Return first 10 items


Data current as of 2021 May 11 00:06 UTC

Computation Interval: Start = 2021 May 11 00:00:00.000, Stop = 2021 May 18 00:00:00.000
Computation Threshold: 5.0 km
Considering: 6,928 Primaries, 20,747 Secondaries (50,694 Conjunctions)

See notes at bottom of page for data field descriptions

Re-sort results by Maximum Probability, Time In.

Action NORAD
Catalog
Number
Name Days
Since
Epoch
Max
Probability
Dilution
Threshold
(km)
Min
Range
(km)
Relative
Velocity
(km/sec)
Start
(UTC)
TCA
(UTC)
Stop
(UTC)
04953 OPS 5268 (DMSP 5A F3) [-] 0.742 2.271E-02 0.005 0.010 13.975
13571 DELTA 1 DEB [-] 0.507 2021 May 11 04:48:03.877 2021 May 11 04:48:04.234 2021 May 11 04:48:04.592
40362 YAOGAN 26 [+] 1.284 1.697E-02 0.006 0.010 14.959
43892 FLOCK 3K-3 [-] 1.481 2021 May 12 03:52:57.972 2021 May 12 03:52:58.306 2021 May 12 03:52:58.640
37841 SRMSAT [+] 0.625 2.299E-02 0.004 0.011 11.490
31085 FENGYUN 1C DEB [-] 1.111 2021 May 11 10:27:33.791 2021 May 11 10:27:34.226 2021 May 11 10:27:34.661
42961 IRIDIUM 132 [+] 5.385 8.304E-03 0.009 0.014 14.860
41352 NOAA 16 DEB [-] 5.783 2021 May 15 19:26:52.198 2021 May 15 19:26:52.535 2021 May 15 19:26:52.871
47706 SPACEBEE-84 [+] 2.649 1.126E-02 0.005 0.019 0.000
47715 SPACEBEE-78 [+] 2.912 2021 May 12 18:01:28.261 2021 May 13 09:17:42.291 2021 May 14 00:03:09.011
47703 SPACEBEE-87 [+] 2.514 1.052E-02 0.005 0.020 0.000
47706 SPACEBEE-84 [+] 2.251 2021 May 12 06:52:07.466 2021 May 12 23:44:32.562 2021 May 13 16:18:51.146
48332 STARLINK-2511 [+] 4.225 8.241E-03 0.005 0.023 0.001
48334 STARLINK-2470 [+] 4.225 2021 May 15 00:48:55.341 2021 May 15 01:23:26.393 2021 May 15 04:13:36.280
47474 FLOCK 4S-8 [+] 1.516 2.108E-03 0.018 0.028 14.967
32170 FENGYUN 1C DEB [-] 2.302 2021 May 11 22:51:07.276 2021 May 11 22:51:07.610 2021 May 11 22:51:07.944
48103 STARLINK-2438 [+] 6.641 3.211E-03 0.009 0.037 0.000
48126 STARLINK-2467 [+] 6.641 2021 May 16 21:14:50.744 2021 May 17 05:23:42.354 2021 May 17 15:39:37.948
46044 STARLINK-1584 [+] 6.457 2.594E-03 0.011 0.038 8.750
47947 OBJECT R [-] 6.069 2021 May 16 19:12:38.073 2021 May 16 19:12:38.645 2021 May 16 19:12:39.216

10 records found

Data Fields:
  • Action: The TLE Data button links to a page which provides the TLEs used to generate the associated prediction.
  • NORAD Catalog Number: NORAD Catalog Numbers of the two conjuncting objects.
  • Name: Common 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 two-line element set or operator ephemerides (green) used to produce the prediction until the time of closest approach for the conjunction.
  • 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.
  • 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.
  • Min Range (km): The distance between the two conjuncting objects at the time of closest approach.
  • Start (UTC): Time when the two conjuncting objects come within the computation threshold from each other.
  • TCA (UTC): Time of closest approach.
  • Stop (UTC): Time when the two conjuncting objects move beyond the computation threshold from each other.
  • Relative Velocity (km/sec): Relative velocity of the two conjuncting objects at the time of closest approach.