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 23 16:05 UTC

Computation Interval: Start = 2018 Feb 23 12:00:00.000, Stop = 2018 Mar 02 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,230 Primaries, 16,764 Secondaries (23,770 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 [+] 0.929 1.000E+00 0.000 0.000 0.000
43211 PROGRESS-MS 08 [+] 0.929 2018 Feb 23 12:00:00.000 2018 Feb 23 12:00:00.000 2018 Mar 02 12:00:00.000
43063 SOYUZ-MS 07 [+] 0.929 1.000E+00 0.000 0.000 0.000
43211 PROGRESS-MS 08 [+] 0.929 2018 Feb 23 12:00:00.000 2018 Feb 23 12:00:00.000 2018 Mar 02 12:00:00.000
42937 SOYUZ-MS 06 [+] 0.929 1.000E+00 0.000 0.000 0.000
43211 PROGRESS-MS 08 [+] 0.929 2018 Feb 23 12:00:00.000 2018 Feb 23 12:00:00.000 2018 Mar 02 12:00:00.000
20670 METEOR 2-19 [?] 2.325 1.024E-02 0.029 0.041 14.740
04935 THORAD AGENA D DEB [-] 2.042 2018 Feb 24 19:00:44.939 2018 Feb 24 19:00:45.278 2018 Feb 24 19:00:45.617
43132 MICROMAS-2A [+] 1.914 1.819E-03 0.012 0.046 0.000
43133 OBJECT Y [+] 1.848 2018 Feb 23 22:55:23.834 2018 Feb 24 17:29:06.144 2018 Feb 25 11:15:22.712
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)
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
39491 COSMOS 2494 (SKRL 756) [-] 2.866 1.074E-03 0.015 0.063 4.020
42845 LEMUR-2-ZACHARY [+] 3.264 2018 Feb 25 18:38:12.261 2018 Feb 25 18:38:13.505 2018 Feb 25 18:38:14.749
16450 COSMOS 1717 [?] 3.263 2.677E-04 0.044 0.063 14.200
12000 DELTA 1 DEB [-] 3.273 2018 Feb 26 03:36:52.637 2018 Feb 26 03:36:52.989 2018 Feb 26 03:36:53.341
12848 AUREOLE 3 [?] 5.139 3.973E-04 0.038 0.069 14.426
22357 SL-16 DEB [-] 6.502 2018 Feb 28 15:16:52.920 2018 Feb 28 15:16:53.267 2018 Feb 28 15:16:53.613
25280 TRACE [-] 6.456 3.290E-04 0.045 0.070 15.030
40909 XW-2E [-] 6.130 2018 Feb 28 23:35:47.057 2018 Feb 28 23:35:47.389 2018 Feb 28 23:35:47.722

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 23 22:14:17 UTC