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 Apr 17 16:01 UTC

Computation Interval: Start = 2014 Apr 17 12:00:00.000, Stop = 2014 Apr 24 12:00:00.000
Computation Threshold: 5.0 km
Considering: 3,427 Primaries, 14,838 Secondaries (17,971 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)
07433 COSMOS 676 [?] 2.532 1.379E-02 0.006 0.027 14.907
38329 DMSP 5D-2 F11 DEB [-] 1.819 2014 Apr 19 00:48:31.409 2014 Apr 19 00:48:31.745 2014 Apr 19 00:48:32.080
10514 METEOR 2-3 [?] 6.403 4.735E-02 0.008 0.032 14.825
13575 DELTA 1 DEB [-] 5.706 2014 Apr 22 21:56:36.672 2014 Apr 22 21:56:37.009 2014 Apr 22 21:56:37.347
39439 FIRST-MOVE [-] 0.656 3.785E-03 0.008 0.034 14.736
35613 COSMOS 2251 DEB [-] 4.004 2014 Apr 17 18:56:06.321 2014 Apr 17 18:56:06.661 2014 Apr 17 18:56:07.000
37790 NIGERIASAT-X [+] 4.515 1.622E-03 0.013 0.050 13.364
26198 CZ-4B DEB [-] 6.138 2014 Apr 22 00:15:28.756 2014 Apr 22 00:15:29.130 2014 Apr 22 00:15:29.504
25481 ORBCOMM FM27 [+] 6.390 2.561E-03 0.017 0.070 14.107
35936 RUBIN 9.1 & RUBIN 9.2 [-] 7.124 2014 Apr 23 15:02:49.028 2014 Apr 23 15:02:49.383 2014 Apr 23 15:02:49.737
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)
06173 TRIAD 1 [?] 5.634 5.246E-03 0.023 0.076 11.287
37998 COSMOS 2251 DEB [-] 6.593 2014 Apr 22 02:43:00.506 2014 Apr 22 02:43:00.949 2014 Apr 22 02:43:01.392
05917 METEOR 1-11 [?] 5.956 8.630E-03 0.018 0.077 14.811
31331 FENGYUN 1C DEB [-] 6.289 2014 Apr 22 01:50:36.423 2014 Apr 22 01:50:36.761 2014 Apr 22 01:50:37.098
14612 COSMOS 1523 [?] 7.077 2.212E-04 0.038 0.091 6.876
23790 COSMOS 2328 [-] 7.054 2014 Apr 23 14:06:56.195 2014 Apr 23 14:06:56.922 2014 Apr 23 14:06:57.649
10590 COSMOS 983 [?] 1.449 9.555E-05 0.047 0.112 6.843
20550 COSMOS 2065 [?] 1.442 2014 Apr 17 13:59:57.860 2014 Apr 17 13:59:58.590 2014 Apr 17 13:59:59.321
25778 IRIDIUM 21 [+] 1.707 2.393E-03 0.033 0.112 11.378
37053 FENGYUN 1C DEB [-] 4.653 2014 Apr 18 21:00:50.741 2014 Apr 18 21:00:51.181 2014 Apr 18 21:00:51.620

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: 2009 May 26
Current system time: 2014 April 17 21:23:41 UTC