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 Feb 24 00:06 UTC

Computation Interval: Start = 2018 Feb 24 00:00:00.000, Stop = 2018 Mar 03 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,230 Primaries, 16,765 Secondaries (23,757 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)
42971 PROGRESS-MS 07 [+] 1.429 1.000E+00 0.000 0.000 0.000
43211 PROGRESS-MS 08 [+] 1.429 2018 Feb 24 00:00:00.000 2018 Feb 24 00:00:00.000 2018 Mar 03 00:00:00.000
43063 SOYUZ-MS 07 [+] 1.429 1.000E+00 0.000 0.000 0.000
43211 PROGRESS-MS 08 [+] 1.429 2018 Feb 24 00:00:00.000 2018 Feb 24 00:00:00.000 2018 Mar 03 00:00:00.000
42937 SOYUZ-MS 06 [+] 1.429 1.000E+00 0.000 0.000 0.000
43211 PROGRESS-MS 08 [+] 1.429 2018 Feb 24 00:00:00.000 2018 Feb 24 00:00:00.000 2018 Mar 03 00:00:00.000
41922 IRIDIUM 104 [+] 7.237 8.279E-04 0.023 0.054 13.112
34487 IRIDIUM 33 DEB [-] 7.206 2018 Mar 02 11:16:21.454 2018 Mar 02 11:16:21.835 2018 Mar 02 11:16:22.217
43132 MICROMAS-2A [+] 0.973 1.085E-03 0.016 0.059 0.000
43133 OBJECT Y [+] 1.368 2018 Feb 24 00:00:00.000 2018 Feb 24 13:50:45.192 2018 Feb 25 06:56:11.377
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)
41958 FLOCK 3P-22 [+] 5.795 1.234E-03 0.014 0.060 0.546
42771 LEMUR-2-SHAINAJOHL [+] 5.675 2018 Mar 01 09:29:21.275 2018 Mar 01 09:29:30.426 2018 Mar 01 09:29:39.577
20670 METEOR 2-19 [?] 1.386 3.882E-03 0.047 0.067 14.740
04935 THORAD AGENA D DEB [-] 1.030 2018 Feb 24 19:00:44.952 2018 Feb 24 19:00:45.292 2018 Feb 24 19:00:45.631
42955 IRIDIUM 133 [+] 0.856 4.959E-04 0.029 0.073 12.579
40431 DMSP 5D-2 F13 DEB [-] 0.988 2018 Feb 24 07:54:06.024 2018 Feb 24 07:54:06.421 2018 Feb 24 07:54:06.818
42843 OBJECT U [+] 3.805 5.194E-04 0.027 0.075 12.125
30497 FENGYUN 1C DEB [-] 4.599 2018 Feb 27 15:09:24.088 2018 Feb 27 15:09:24.500 2018 Feb 27 15:09:24.913
10137 COSMOS 926 [?] 2.797 1.423E-03 0.022 0.079 8.034
42276 DMSP 5D-2 F13 DEB [-] 24.214 2018 Feb 26 07:53:14.744 2018 Feb 26 07:53:15.366 2018 Feb 26 07:53:15.989

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 February 24 02:23:56 UTC