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 11 00:06 UTC

Computation Interval: Start = 2018 Dec 11 00:00:00.000, Stop = 2018 Dec 18 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,447 Primaries, 17,165 Secondaries (25,221 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 [+] 3.234 1.000E+00 0.000 0.000 0.000
43846 CZ-3B R/B [-] 3.234 2018 Dec 11 00:00:00.000 2018 Dec 11 00:00:00.000 2018 Dec 18 00:00:00.000
11046 COSMOS 1037 [?] 3.891 3.995E-03 0.005 0.023 2.062
16762 COSMOS 1752 [?] 4.526 2018 Dec 14 08:20:21.909 2018 Dec 14 08:20:24.334 2018 Dec 14 08:20:26.758
05180 COSMOS 409 [?] 3.565 3.461E-03 0.012 0.025 13.515
39410 YAOGAN 19 [+] 2.760 2018 Dec 13 11:27:22.633 2018 Dec 13 11:27:23.003 2018 Dec 13 11:27:23.373
12456 METEOR 2-7 [?] 6.224 1.674E-02 0.022 0.032 14.796
30930 FENGYUN 1C DEB [-] 5.684 2018 Dec 16 09:29:29.666 2018 Dec 16 09:29:30.004 2018 Dec 16 09:29:30.342
25287 IRIDIUM 64 [B] 2.944 6.824E-03 0.028 0.041 14.887
04954 THOR BURNER 2 R/B [-] 3.769 2018 Dec 13 09:52:49.252 2018 Dec 13 09:52:49.588 2018 Dec 13 09:52:49.924
41901 SPARK 2 [+] 4.480 4.514E-04 0.039 0.059 14.895
20435 SL-8 DEB [-] 4.554 2018 Dec 15 00:22:27.716 2018 Dec 15 00:22:28.052 2018 Dec 15 00:22:28.388
16952 COSMOS 1777 [?] 5.182 6.190E-04 0.034 0.069 13.879
22828 KITSAT B [-] 5.125 2018 Dec 15 00:45:45.766 2018 Dec 15 00:45:46.126 2018 Dec 15 00:45:46.487
27940 RUBIN-4 & SL-8 R/B [?] 6.996 8.485E-04 0.017 0.071 3.363
34626 COSMOS 2251 DEB [-] 6.541 2018 Dec 17 10:54:29.113 2018 Dec 17 10:54:30.600 2018 Dec 17 10:54:32.087
24883 ORBVIEW 2 (SEASTAR) [-] 4.099 2.149E-02 0.021 0.075 8.500
43071 IRIDIUM 138 [+] 4.376 2018 Dec 14 21:10:52.862 2018 Dec 14 21:10:53.451 2018 Dec 14 21:10:54.039
06679 COSMOS 568 [?] 6.106 1.373E-04 0.039 0.093 12.564
14178 COSMOS 1480 [?] 5.634 2018 Dec 15 14:33:42.633 2018 Dec 15 14:33:43.031 2018 Dec 15 14:33:43.429

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 11 01:31:34 UTC
Accessed 1 times since 2000 December 16
Current system time: 2018 Dec 11 02:54:50 UTC