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 21 16:05 UTC

Computation Interval: Start = 2017 Oct 21 12:00:00.000, Stop = 2017 Oct 28 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,096 Primaries, 16,684 Secondaries (22,449 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)
31698 TERRASAR-X [+] 2.052 2.079E-02 0.003 0.014 0.001
36605 TANDEM-X [+] 1.575 2017 Oct 21 12:00:00.000 2017 Oct 23 02:22:27.565 2017 Oct 23 14:12:32.076
39091 BRITE-AUSTRIA [+] 2.661 9.428E-04 0.024 0.046 14.155
31548 FENGYUN 1C DEB [-] 2.446 2017 Oct 23 04:50:57.816 2017 Oct 23 04:50:58.169 2017 Oct 23 04:50:58.523
25480 ORBCOMM FM26 [-] 5.274 2.959E-03 0.022 0.046 13.813
37931 SHIYAN 4 (SY-4) [+] 5.312 2017 Oct 26 19:18:03.229 2017 Oct 26 19:18:03.591 2017 Oct 26 19:18:03.953
31862 DIRECTV 10 [+] 2.059 1.514E-03 0.013 0.054 0.000
36131 DIRECTV 12 [+] 1.876 2017 Oct 21 12:00:00.000 2017 Oct 23 06:16:25.031 2017 Oct 26 15:22:46.416
11735 COSMOS 1168 [?] 0.973 2.669E-03 0.015 0.060 5.562
15559 COSMOS 970 DEB [-] 3.564 2017 Oct 21 22:21:24.831 2017 Oct 21 22:21:25.730 2017 Oct 21 22:21:26.629
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)
39090 STRAND-1 [+] 1.398 3.606E-04 0.045 0.064 14.896
34023 COSMOS 2251 DEB [-] 1.674 2017 Oct 22 05:00:34.995 2017 Oct 22 05:00:35.331 2017 Oct 22 05:00:35.667
21230 COSMOS 2142 [?] 1.744 3.729E-03 0.017 0.065 6.744
30327 FENGYUN 1C DEB [-] 4.061 2017 Oct 22 16:15:48.163 2017 Oct 22 16:15:48.905 2017 Oct 22 16:15:49.646
35932 SWISSCUBE [+] 1.002 2.654E-04 0.052 0.075 14.977
34924 COSMOS 2251 DEB [-] 1.227 2017 Oct 21 23:08:12.003 2017 Oct 21 23:08:12.336 2017 Oct 21 23:08:12.670
25530 IRIDIUM 84 [+] 4.715 9.476E-03 0.019 0.075 6.322
25980 ORBCOMM FM30 [+] 4.995 2017 Oct 26 03:22:52.587 2017 Oct 26 03:22:53.378 2017 Oct 26 03:22:54.169
25343 IRIDIUM 72 [+] 4.886 1.980E-03 0.054 0.084 14.705
34139 COSMOS 2251 DEB [-] 4.826 2017 Oct 26 03:38:39.865 2017 Oct 26 03:38:40.205 2017 Oct 26 03:38:40.545

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 21 21:16:01 UTC