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 Dec 14 00:06 UTC

Computation Interval: Start = 2018 Dec 14 00:00:00.000, Stop = 2018 Dec 21 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,460 Primaries, 17,200 Secondaries (25,429 Conjunctions)

See notes at bottom of page for data field descriptions

Re-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)
43845 CHANG'E-4 [+] 6.234 1.000E+00 0.000 0.000 0.000
43846 CZ-3B R/B [-] 6.234 2018 Dec 14 00:00:00.000 2018 Dec 14 00:00:00.000 2018 Dec 21 00:00:00.000
13241 COSMOS 1371 [?] 5.357 1.000E+00 0.000 0.003 14.829
17118 ARIANE 1 DEB [-] 6.308 2018 Dec 19 05:19:38.056 2018 Dec 19 05:19:38.393 2018 Dec 19 05:19:38.730
06679 COSMOS 568 [?] 3.086 3.800E-03 0.007 0.018 12.564
14178 COSMOS 1480 [?] 2.734 2018 Dec 15 14:33:42.629 2018 Dec 15 14:33:43.027 2018 Dec 15 14:33:43.425
43734 FLOCK 3R-3 [+] 5.657 8.773E-03 0.005 0.022 0.000
43747 FLOCK 3R-1 [+] 5.597 2018 Dec 17 00:10:02.496 2018 Dec 19 11:03:05.502 2018 Dec 21 00:00:00.000
15986 COSMOS 1677 [?] 2.900 1.862E-02 0.013 0.046 9.174
30391 FENGYUN 1C DEB [-] 2.489 2018 Dec 16 07:37:43.565 2018 Dec 16 07:37:44.110 2018 Dec 16 07:37:44.655
11081 CAMEO & DELTA 1 R/B [?] 5.175 4.905E-04 0.027 0.052 13.927
29762 FENGYUN 1C DEB [-] 4.700 2018 Dec 18 12:16:04.424 2018 Dec 18 12:16:04.783 2018 Dec 18 12:16:05.142
15494 COSMOS 1626 [?] 1.526 1.315E-03 0.015 0.053 8.676
23975 PEGASUS DEB [-] 1.774 2018 Dec 15 06:07:13.404 2018 Dec 15 06:07:13.980 2018 Dec 15 06:07:14.556
33497 SDS-1 [-] 1.917 5.796E-04 0.034 0.053 14.858
34739 COSMOS 2251 DEB [-] 2.365 2018 Dec 15 19:20:57.640 2018 Dec 15 19:20:57.977 2018 Dec 15 19:20:58.313
40286 SJ-11-08 [+] 1.171 1.377E-03 0.014 0.056 3.956
37297 COSMOS 2251 DEB [-] 3.086 2018 Dec 15 01:18:33.889 2018 Dec 15 01:18:35.152 2018 Dec 15 01:18:36.416
27609 TRAILBLAZER 2 [-] 3.293 9.696E-04 0.017 0.062 8.292
04861 THORAD AGENA D DEB [-] 3.272 2018 Dec 17 02:01:15.609 2018 Dec 17 02:01:16.212 2018 Dec 17 02:01:16.815

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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Last updated: 2018 Dec 14 01:34:53 UTC
Accessed 1 times since 2000 December 16
Current system time: 2018 Dec 14 07:39:19 UTC