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 2018 Apr 24 00:06 UTC

Computation Interval: Start = 2018 Apr 24 00:00:00.000, Stop = 2018 May 01 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,233 Primaries, 16,953 Secondaries (23,700 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)
11605 METEOR 2-5 [?] 0.728 4.584E-03 0.041 0.065 14.567
32110 FENGYUN 1C DEB [-] 0.560 2018 Apr 24 04:37:55.467 2018 Apr 24 04:37:55.811 2018 Apr 24 04:37:56.154
09846 COSMOS 894 [?] 5.492 3.706E-03 0.016 0.068 3.554
42175 COSMOS 1275 DEB [-] 17.313 2018 Apr 29 02:46:09.289 2018 Apr 29 02:46:10.695 2018 Apr 29 02:46:12.102
35865 METEOR-M 1 [P] 4.836 7.311E-04 0.019 0.076 4.808
29906 FENGYUN 1C DEB [-] 5.114 2018 Apr 28 17:05:03.389 2018 Apr 28 17:05:04.429 2018 Apr 28 17:05:05.469
16181 COSMOS 1697 [?] 0.555 6.535E-04 0.020 0.079 5.853
30474 FENGYUN 1C DEB [-] 0.197 2018 Apr 24 01:45:51.912 2018 Apr 24 01:45:52.766 2018 Apr 24 01:45:53.620
27640 CORIOLIS [+] 5.601 5.916E-04 0.021 0.083 6.113
31341 FENGYUN 1C DEB [-] 5.542 2018 Apr 29 04:12:51.431 2018 Apr 29 04:12:52.249 2018 Apr 29 04:12:53.067
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)
08288 COSMOS 764 [?] 1.987 1.403E-04 0.061 0.087 14.203
03123 DELTA 1 DEB [-] 2.183 2018 Apr 25 13:51:34.492 2018 Apr 25 13:51:34.844 2018 Apr 25 13:51:35.196
33314 RAPIDEYE 1 [+] 2.799 2.156E-04 0.055 0.087 14.862
20847 CZ-4 DEB [-] 3.113 2018 Apr 26 15:24:00.273 2018 Apr 26 15:24:00.609 2018 Apr 26 15:24:00.946
41922 IRIDIUM 104 [+] 3.160 1.671E-04 0.064 0.098 14.741
26449 CZ-4B DEB [-] 3.121 2018 Apr 26 16:42:29.285 2018 Apr 26 16:42:29.625 2018 Apr 26 16:42:29.964
07574 METEOR 1-20 [?] 6.415 1.890E-03 0.065 0.099 14.702
36331 METEOR 2-8 DEB [-] 6.670 2018 Apr 30 02:44:51.152 2018 Apr 30 02:44:51.492 2018 Apr 30 02:44:51.832
42048 FLOCK 3P-74 [+] 3.332 3.564E-04 0.026 0.111 0.654
42774 LEMUR-2-KUNGFOO [+] 3.207 2018 Apr 26 19:00:39.401 2018 Apr 26 19:00:47.045 2018 Apr 26 19:00:54.689

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: 2018 April 24 02:49:02 UTC