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 2014 Aug 22 16:01 UTC

Computation Interval: Start = 2014 Aug 22 12:00:00.000, Stop = 2014 Aug 29 12:00:00.000
Computation Threshold: 5.0 km
Considering: 3,482 Primaries, 14,967 Secondaries (18,371 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)
21796 COSMOS 2173 [?] 1.680 8.196E-03 0.012 0.043 12.748
30388 FENGYUN 1C DEB [-] 2.260 2014 Aug 23 13:08:00.779 2014 Aug 23 13:08:01.171 2014 Aug 23 13:08:01.563
25777 IRIDIUM 14 [S] 3.590 1.348E-02 0.014 0.047 11.285
00320 THOR ABLESTAR DEB [-] 5.134 2014 Aug 25 20:33:14.109 2014 Aug 25 20:33:14.552 2014 Aug 25 20:33:14.995
07267 COSMOS 643 [?] 4.350 1.005E-03 0.014 0.053 12.452
03617 OPS 7684 DEB [-] 3.419 2014 Aug 25 19:55:43.535 2014 Aug 25 19:55:43.936 2014 Aug 25 19:55:44.338
24772 COSMOS 2341 [?] 3.382 5.223E-03 0.014 0.057 13.972
32179 FENGYUN 1C DEB [-] 6.407 2014 Aug 25 13:47:49.846 2014 Aug 25 13:47:50.204 2014 Aug 25 13:47:50.562
35868 TATIANA 2 [-] 5.292 9.492E-04 0.016 0.068 14.847
22549 SL-16 DEB [-] 5.376 2014 Aug 27 17:59:27.811 2014 Aug 27 17:59:28.148 2014 Aug 27 17:59:28.484
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)
24906 IRIDIUM 23 [S] 5.108 5.522E-03 0.020 0.082 14.864
35186 FENGYUN 1C DEB [-] 5.906 2014 Aug 27 11:31:39.285 2014 Aug 27 11:31:39.621 2014 Aug 27 11:31:39.957
00116 TRANSIT 4A [?] 3.539 9.090E-04 0.024 0.087 12.542
31462 FENGYUN 1C DEB [-] 3.703 2014 Aug 25 23:23:14.901 2014 Aug 25 23:23:15.299 2014 Aug 25 23:23:15.698
27605 RUBIN-2 & SAFIR-M [-] 1.834 4.037E-04 0.026 0.099 13.446
26650 CZ-4B DEB [-] 5.100 2014 Aug 24 08:01:38.584 2014 Aug 24 08:01:38.955 2014 Aug 24 08:01:39.327
16860 COSMOS 1763 [?] 7.921 7.951E-04 0.027 0.114 14.807
30637 FENGYUN 1C DEB [-] 7.954 2014 Aug 29 09:09:08.122 2014 Aug 29 09:09:08.459 2014 Aug 29 09:09:08.797
22561 START 1 [?] 6.032 3.332E-04 0.027 0.115 15.107
38809 FENGYUN 1C DEB [-] 8.472 2014 Aug 27 20:23:22.417 2014 Aug 27 20:23:22.748 2014 Aug 27 20:23:23.079

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/TS.Kelso@centerforspace.com]
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Format last updated: 2014 May 16
Current system time: 2014 August 22 19:37:25 UTC