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 2017 Oct 17 00:05 UTC

Computation Interval: Start = 2017 Oct 17 00:00:00.000, Stop = 2017 Oct 24 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,097 Primaries, 16,682 Secondaries (22,863 Conjunctions)

See notes at bottom of page for data field descriptions

Bookmark this search (Top 10 by Minimum Range)

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)
27941 NIGERIASAT-1 [-] 3.637 6.717E-03 0.006 0.025 5.264
36454 COSMOS 2251 DEB [-] 5.759 2017 Oct 20 01:28:20.290 2017 Oct 20 01:28:21.240 2017 Oct 20 01:28:22.189
33321 HUANJING 1B (HJ-1B) [+] 1.325 1.091E-03 0.026 0.037 15.023
34898 IRIDIUM 33 DEB [-] 1.977 2017 Oct 18 02:57:24.408 2017 Oct 18 02:57:24.741 2017 Oct 18 02:57:25.074
08845 METEOR 1-25 [?] 2.321 1.682E-02 0.020 0.037 14.141
42324 DMSP 5D-2 F13 DEB [-] 3.077 2017 Oct 19 01:06:28.583 2017 Oct 19 01:06:28.937 2017 Oct 19 01:06:29.291
37855 M-CUBED & EXP-1 PRIME [+] 6.366 2.735E-03 0.010 0.039 4.027
35856 IRIDIUM 33 DEB [-] 6.367 2017 Oct 22 21:34:48.218 2017 Oct 22 21:34:49.459 2017 Oct 22 21:34:50.701
33492 GOSAT (IBUKI) [+] 3.092 2.733E-03 0.009 0.040 0.295
37032 FENGYUN 1C DEB [-] 4.126 2017 Oct 19 21:24:48.435 2017 Oct 19 21:25:05.397 2017 Oct 19 21:25:22.360
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)
10137 COSMOS 926 [?] 3.853 3.218E-03 0.016 0.048 10.787
30309 FENGYUN 1C DEB [-] 3.725 2017 Oct 20 03:52:27.320 2017 Oct 20 03:52:27.783 2017 Oct 20 03:52:28.246
39086 SARAL [+] 3.753 6.590E-04 0.029 0.054 14.192
34297 COSMOS 2251 DEB [-] 3.999 2017 Oct 20 13:43:33.507 2017 Oct 20 13:43:33.860 2017 Oct 20 13:43:34.212
25290 IRIDIUM 67 [+] 6.437 8.306E-03 0.018 0.058 10.648
35483 IRIDIUM 33 DEB [-] 6.803 2017 Oct 22 17:31:59.111 2017 Oct 22 17:31:59.581 2017 Oct 22 17:32:00.051
14611 COSMOS 1522 [?] 0.589 3.348E-04 0.025 0.060 12.431
17141 COSMOS 1797 [?] 0.461 2017 Oct 17 01:50:34.326 2017 Oct 17 01:50:34.729 2017 Oct 17 01:50:35.131
27847 CANX-1 [-] 2.585 8.643E-04 0.017 0.071 2.547
32115 FENGYUN 1C DEB [-] 8.372 2017 Oct 19 06:46:07.520 2017 Oct 19 06:46:09.483 2017 Oct 19 06:46:11.446

10 records found

Data Fields:
  • Action: The Analysis button links to a page which provides a capability to build an interactive 3-D STK/CAT (Conjunction Analysis Tools) scenario detailing the conjunction.
  • 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.

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Dr. T.S. Kelso [TS.Kelso@celestrak.com]
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Format last updated: 2014 May 16
Current system time: 2017 October 17 09:33:16 UTC