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 Jan 23 00:05 UTC

Computation Interval: Start = 2017 Jan 23 00:00:00.000, Stop = 2017 Jan 30 00:00:00.000
Computation Threshold: 5.0 km
Considering: 3,802 Primaries, 15,776 Secondaries (20,116 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)
25406 COSMOS 2360 [?] 6.693 1.329E-02 0.004 0.018 3.709
38797 FENGYUN 1C DEB [-] 6.954 2017 Jan 28 23:07:35.925 2017 Jan 28 23:07:37.273 2017 Jan 28 23:07:38.622
40011 HODOYOSHI-4 [+] 1.501 1.444E-03 0.021 0.034 14.802
41922 IRIDIUM 104 [+] 2.176 2017 Jan 24 07:31:08.318 2017 Jan 24 07:31:08.656 2017 Jan 24 07:31:08.993
25757 DLR-TUBSAT [+] 4.847 2.319E-04 0.028 0.059 13.909
31559 FENGYUN 1C DEB [-] 5.715 2017 Jan 27 01:17:57.595 2017 Jan 27 01:17:57.955 2017 Jan 27 01:17:58.314
13353 COSMOS 1386 [?] 6.579 3.823E-03 0.018 0.060 11.459
30797 THEMIS D [+] 7.040 2017 Jan 28 23:22:55.496 2017 Jan 28 23:22:55.932 2017 Jan 28 23:22:56.369
27848 CUBESAT XI-IV (CO-57) [+] 3.904 3.003E-04 0.049 0.071 14.838
33766 COSMOS 2251 DEB [-] 3.925 2017 Jan 25 20:49:33.836 2017 Jan 25 20:49:34.173 2017 Jan 25 20:49:34.510
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)
25432 IRIDIUM 76 [+] 6.720 2.757E-03 0.045 0.072 14.661
41425 NOAA 16 DEB [-] 6.448 2017 Jan 29 03:14:43.869 2017 Jan 29 03:14:44.210 2017 Jan 29 03:14:44.551
26561 HETE-2 [-] 4.911 1.172E-03 0.025 0.089 9.115
36479 COSMOS 2251 DEB [-] 5.807 2017 Jan 26 02:17:07.258 2017 Jan 26 02:17:07.807 2017 Jan 26 02:17:08.355
25414 ORBCOMM FM18 [+] 3.140 2.700E-03 0.037 0.091 12.830
16012 SL-8 R/B [-] 3.656 2017 Jan 25 23:45:51.129 2017 Jan 25 23:45:51.518 2017 Jan 25 23:45:51.908
41921 IRIDIUM 105 [+] 6.656 1.031E-03 0.025 0.096 6.724
17192 SL-14 R/B [-] 6.985 2017 Jan 29 03:08:08.482 2017 Jan 29 03:08:09.226 2017 Jan 29 03:08:09.969
15099 METEOR 2-11 [?] 3.249 1.639E-03 0.073 0.103 14.702
35167 FENGYUN 1C DEB [-] 6.369 2017 Jan 25 10:53:11.147 2017 Jan 25 10:53:11.487 2017 Jan 25 10:53:11.827

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: 2017 January 23 12:34:22 UTC