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 2017 Dec 13 16:08 UTC

Computation Interval: Start = 2017 Dec 13 12:00:00.000, Stop = 2017 Dec 20 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,145 Primaries, 16,767 Secondaries (23,208 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)
24304 COSMOS 2334 [?] 6.264 1.056E-02 0.016 0.024 14.620
38824 FENGYUN 1C DEB [-] 7.480 2017 Dec 19 10:39:43.593 2017 Dec 19 10:39:43.935 2017 Dec 19 10:39:44.277
42886 FLOCK 2K-19 [+] 6.173 1.164E-03 0.022 0.041 14.414
37182 CZ-4B DEB [-] 6.193 2017 Dec 19 09:03:22.607 2017 Dec 19 09:03:22.953 2017 Dec 19 09:03:23.300
25432 IRIDIUM 76 [+] 1.232 1.300E-02 0.018 0.041 13.544
26375 PEGASUS R/B [-] 1.993 2017 Dec 14 17:48:01.158 2017 Dec 14 17:48:01.527 2017 Dec 14 17:48:01.897
43041 OBJECT E [+] 1.242 1.882E-03 0.011 0.048 0.003
43046 OBJECT K [+] 1.437 2017 Dec 14 08:17:17.504 2017 Dec 14 08:35:45.005 2017 Dec 14 08:54:21.871
05557 OPS 4311 (DMSP 5B F1) [-] 0.226 1.374E-03 0.015 0.050 10.105
31311 FENGYUN 1C DEB [-] 0.712 2017 Dec 13 15:16:39.668 2017 Dec 13 15:16:40.163 2017 Dec 13 15:16:40.658
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)
17066 COSMOS 1791 [?] 4.065 4.465E-03 0.034 0.052 14.585
07769 SL-8 R/B [-] 4.538 2017 Dec 17 07:04:48.872 2017 Dec 17 07:04:49.215 2017 Dec 17 07:04:49.558
18937 COSMOS 1924 [?] 2.006 5.442E-03 0.026 0.073 11.482
25162 GLOBALSTAR M001 [-] 2.020 2017 Dec 15 05:34:57.158 2017 Dec 15 05:34:57.594 2017 Dec 15 05:34:58.029
20510 OKEAN-2 [?] 4.773 1.019E-02 0.018 0.074 2.988
35906 COSMOS 2251 DEB [-] 5.447 2017 Dec 17 21:30:27.062 2017 Dec 17 21:30:28.735 2017 Dec 17 21:30:30.409
11962 METEOR 2-6 [?] 6.154 2.464E-03 0.058 0.086 14.759
42360 NOAA 16 DEB [-] 6.323 2017 Dec 19 08:50:13.185 2017 Dec 19 08:50:13.524 2017 Dec 19 08:50:13.863
41784 PISAT [+] 0.835 1.870E-04 0.061 0.092 14.890
34378 IRIDIUM 33 DEB [-] 0.918 2017 Dec 13 17:55:38.544 2017 Dec 13 17:55:38.880 2017 Dec 13 17:55:39.216

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: 2014 May 16
Current system time: 2017 December 13 22:44:38 UTC