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 Jun 23 16:07 UTC

Computation Interval: Start = 2018 Jun 23 12:00:00.000, Stop = 2018 Jun 30 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,241 Primaries, 17,014 Secondaries (24,182 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)
43014 BUCCANEER RMM [+] 4.365 2.896E-04 0.048 0.075 14.907
42314 DMSP 5D-2 F13 DEB [-] 3.838 2018 Jun 27 03:10:58.424 2018 Jun 27 03:10:58.759 2018 Jun 27 03:10:59.095
37179 SJ-6G [+] 4.588 2.396E-04 0.055 0.079 15.063
35897 COSMOS 2251 DEB [-] 5.846 2018 Jun 28 01:33:18.842 2018 Jun 28 01:33:19.174 2018 Jun 28 01:33:19.506
27846 AAU CUBESAT [-] 6.616 2.497E-04 0.052 0.080 14.774
31471 FENGYUN 1C DEB [-] 6.263 2018 Jun 29 13:40:28.041 2018 Jun 29 13:40:28.380 2018 Jun 29 13:40:28.718
27001 METEOR-3M [?] 3.582 1.014E-03 0.059 0.085 14.681
06708 SL-8 R/B [-] 3.572 2018 Jun 26 12:22:58.703 2018 Jun 26 12:22:59.043 2018 Jun 26 12:22:59.384
33064 ORBCOMM FM37 [-] 1.692 4.151E-04 0.026 0.095 8.541
35681 DEIMOS-1 [+] 1.658 2018 Jun 25 01:59:31.472 2018 Jun 25 01:59:32.057 2018 Jun 25 01:59:32.642
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)
04259 OPS 7613 (P/L 3) [?] 4.637 2.850E-04 0.038 0.096 12.634
42103 COSMOS 1275 DEB [-] 5.179 2018 Jun 27 22:36:00.735 2018 Jun 27 22:36:01.131 2018 Jun 27 22:36:01.526
41790 SCATSAT 1 [+] 2.044 4.198E-04 0.025 0.100 4.736
33940 COSMOS 2251 DEB [-] 1.629 2018 Jun 24 17:39:45.923 2018 Jun 24 17:39:46.978 2018 Jun 24 17:39:48.034
08895 COSMOS 831 [?] 4.627 1.401E-04 0.032 0.113 8.094
18937 COSMOS 1924 [?] 4.620 2018 Jun 27 12:44:39.865 2018 Jun 27 12:44:40.483 2018 Jun 27 12:44:41.100
43479 IRIDIUM 152 [-] 5.148 2.965E-04 0.031 0.115 7.321
13827 DELTA 1 DEB [-] 5.425 2018 Jun 28 08:15:28.006 2018 Jun 28 08:15:28.688 2018 Jun 28 08:15:29.371
17239 COSMOS 1808 [?] 5.768 9.254E-04 0.039 0.116 11.098
26841 DELTA 1 DEB [-] 5.677 2018 Jun 28 20:13:30.493 2018 Jun 28 20:13:30.944 2018 Jun 28 20:13:31.394

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 June 23 23:26:38 UTC