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 Jun 26 00:05 UTC

Computation Interval: Start = 2017 Jun 26 00:00:00.000, Stop = 2017 Jul 03 00:00:00.000
Computation Threshold: 5.0 km
Considering: 3,991 Primaries, 16,538 Secondaries (22,921 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)
13164 COSMOS 1361 [?] 6.637 2.377E-03 0.015 0.021 14.259
42595 THORAD DELTA 1 DEB [-] 6.693 2017 Jul 01 18:24:37.302 2017 Jul 01 18:24:37.652 2017 Jul 01 18:24:38.003
40119 BRITE-PL 2 [+] 5.209 5.902E-03 0.017 0.024 15.112
18153 SL-14 R/B [-] 5.278 2017 Jun 30 17:11:55.561 2017 Jun 30 17:11:55.892 2017 Jun 30 17:11:56.223
42712 SHARC [+] 5.958 4.575E-03 0.007 0.031 0.005
42721 CHALLENGER [+] 5.956 2017 Jul 01 12:14:34.013 2017 Jul 01 12:30:04.527 2017 Jul 01 12:44:22.355
13718 METEOR 2-9 [?] 0.831 2.394E-02 0.016 0.032 13.901
27845 QUAKESAT [-] 0.827 2017 Jun 26 06:59:39.479 2017 Jun 26 06:59:39.839 2017 Jun 26 06:59:40.199
21574 ERS-1 [-] 6.091 2.933E-02 0.022 0.034 14.869
04895 THORAD AGENA D DEB [-] 6.200 2017 Jul 01 13:39:32.813 2017 Jul 01 13:39:33.149 2017 Jul 01 13:39:33.485
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)
42787 OBJECT Y [+] 3.666 2.220E-03 0.011 0.044 0.001
42788 OBJECT Z [+] 4.521 2017 Jun 26 00:00:00.000 2017 Jun 29 05:45:45.201 2017 Jun 30 23:30:10.632
41977 FLOCK 3P-58 [+] 4.387 2.125E-03 0.011 0.045 0.006
41981 FLOCK 3P-73 [+] 4.321 2017 Jun 29 21:21:32.147 2017 Jun 29 21:38:50.145 2017 Jun 29 21:56:01.983
42732 POLYITAN-2-SAU [+] 2.396 1.517E-03 0.013 0.054 0.003
42734 EXALTA-1 [+] 2.588 2017 Jun 27 21:13:31.494 2017 Jun 27 21:33:57.246 2017 Jun 27 21:54:16.407
13027 COSMOS 1331 [?] 5.194 1.125E-03 0.039 0.057 14.890
35128 FENGYUN 1C DEB [-] 5.958 2017 Jun 30 07:20:25.466 2017 Jun 30 07:20:25.802 2017 Jun 30 07:20:26.138
41854 PROMETHEUS 2-1 [+] 6.166 5.031E-04 0.035 0.059 14.719
14807 SL-8 DEB [-] 6.086 2017 Jul 01 09:27:50.378 2017 Jul 01 09:27:50.717 2017 Jul 01 09:27:51.057

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 June 26 01:53:38 UTC