SOCRATES

Search Results


Search parameters:

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


Data current as of 2014 Jul 30 00:02 UTC

Computation Interval: Start = 2014 Jul 30 00:00:00.000, Stop = 2014 Aug 06 00:00:00.000
Computation Threshold: 5.0 km
Considering: 3,471 Primaries, 14,970 Secondaries (18,602 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)
25274 IRIDIUM 58 [+] 1.379 3.305E-02 0.009 0.030 11.880
30158 FENGYUN 1C DEB [-] 1.878 2014 Jul 30 20:02:51.863 2014 Jul 30 20:02:52.284 2014 Jul 30 20:02:52.705
20439 PACSAT (AO-16) [-] 6.332 5.048E-04 0.026 0.038 1.701
29842 FENGYUN 1C DEB [-] 6.377 2014 Aug 04 04:50:02.134 2014 Aug 04 04:50:05.073 2014 Aug 04 04:50:08.012
31126 MAST [-] 3.222 2.344E-03 0.011 0.040 12.704
39847 SL-16 DEB [-] 11.623 2014 Aug 01 17:18:50.420 2014 Aug 01 17:18:50.813 2014 Aug 01 17:18:51.207
10520 COSMOS 968 [?] 5.357 4.271E-03 0.013 0.044 11.684
39539 FENGYUN 1C DEB [-] 5.501 2014 Aug 03 21:58:10.553 2014 Aug 03 21:58:10.981 2014 Aug 03 21:58:11.409
33316 RAPIDEYE 4 [+] 5.899 4.551E-03 0.012 0.046 13.804
14148 SL-14 R/B [-] 7.076 2014 Aug 04 14:25:24.159 2014 Aug 04 14:25:24.522 2014 Aug 04 14:25:24.884
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)
39416 APRIZESAT 7 [+] 7.404 9.429E-04 0.017 0.065 13.252
31694 FENGYUN 1C DEB [-] 6.498 2014 Aug 05 06:17:24.542 2014 Aug 05 06:17:24.919 2014 Aug 05 06:17:25.297
25273 IRIDIUM 57 [+] 4.135 5.698E-03 0.021 0.073 11.706
29870 FENGYUN 1C DEB [-] 4.830 2014 Aug 02 14:02:12.468 2014 Aug 02 14:02:12.895 2014 Aug 02 14:02:13.322
25114 ORBCOMM FM11 [+] 6.449 8.649E-04 0.042 0.084 5.237
04895 THORAD AGENA D DEB [-] 6.822 2014 Aug 04 22:07:04.405 2014 Aug 04 22:07:05.360 2014 Aug 04 22:07:06.314
37788 EDUSAT [+] 5.921 3.809E-04 0.027 0.100 12.607
30819 FENGYUN 1C DEB [-] 10.582 2014 Aug 03 18:14:24.214 2014 Aug 03 18:14:24.611 2014 Aug 03 18:14:25.007
25624 GLOBALSTAR M038 [-] 0.537 1.657E-03 0.067 0.104 1.847
20174 THOR ABLESTAR DEB [-] 2.239 2014 Jul 30 07:35:05.767 2014 Jul 30 07:35:08.474 2014 Jul 30 07:35:11.180

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 July 30 09:02:50 UTC