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 Apr 25 00:09 UTC

Computation Interval: Start = 2018 Apr 25 00:00:00.000, Stop = 2018 May 02 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,234 Primaries, 16,970 Secondaries (23,534 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)
08288 COSMOS 764 [?] 0.687 5.182E-04 0.032 0.045 14.203
03123 DELTA 1 DEB [-] 1.141 2018 Apr 25 13:51:34.313 2018 Apr 25 13:51:34.665 2018 Apr 25 13:51:35.017
27640 CORIOLIS [+] 4.544 1.614E-03 0.013 0.050 6.113
31341 FENGYUN 1C DEB [-] 5.077 2018 Apr 29 04:12:51.433 2018 Apr 29 04:12:52.251 2018 Apr 29 04:12:53.069
12783 COSMOS 1299 [?] 5.592 5.808E-03 0.036 0.055 14.648
31246 FENGYUN 1C DEB [-] 6.251 2018 Apr 30 04:46:09.159 2018 Apr 30 04:46:09.500 2018 Apr 30 04:46:09.842
31698 TERRASAR-X [+] 2.427 7.857E-04 0.018 0.075 0.001
36605 TANDEM-X [+] 4.342 2018 Apr 26 08:29:05.428 2018 Apr 27 07:17:37.515 2018 Apr 28 08:28:53.828
32958 FENGYUN 3A [+] 1.101 7.257E-04 0.019 0.076 4.517
34114 COSMOS 2251 DEB [-] 1.562 2018 Apr 25 23:18:30.688 2018 Apr 25 23:18:31.795 2018 Apr 25 23:18:32.901
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)
40715 DMC3-FM1 [+] 4.877 3.333E-04 0.041 0.077 14.270
43388 WORLDVIEW-2 DEB [-] 5.948 2018 Apr 29 16:49:31.970 2018 Apr 29 16:49:32.320 2018 Apr 29 16:49:32.670
42798 COSMOS 2519 [+] 3.346 6.958E-04 0.019 0.079 0.001
42919 COSMOS 2521 [+] 3.346 2018 Apr 25 00:00:00.000 2018 Apr 27 20:32:42.247 2018 May 02 00:00:00.000
40071 DX1 [+] 6.530 3.901E-04 0.067 0.095 15.049
15370 SL-14 R/B [-] 7.003 2018 May 01 09:04:01.663 2018 May 01 09:04:01.995 2018 May 01 09:04:02.328
41922 IRIDIUM 104 [+] 2.253 1.485E-04 0.067 0.104 14.741
26449 CZ-4B DEB [-] 2.277 2018 Apr 26 16:42:29.292 2018 Apr 26 16:42:29.631 2018 Apr 26 16:42:29.970
10520 COSMOS 968 [?] 4.625 3.878E-04 0.057 0.112 14.056
36435 COSMOS 2251 DEB [-] 4.818 2018 Apr 29 04:22:33.389 2018 Apr 29 04:22:33.744 2018 Apr 29 04:22:34.100

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: 2018 April 25 04:38:13 UTC