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 Dec 11 08:06 UTC

Computation Interval: Start = 2017 Dec 11 00:00:00.000, Stop = 2017 Dec 18 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,127 Primaries, 16,741 Secondaries (23,578 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)
27847 CANX-1 [-] 3.278 2.990E-02 0.005 0.007 14.796
29047 FORMOSAT-3 FM6 [+] 3.284 2017 Dec 14 04:58:12.430 2017 Dec 14 04:58:12.768 2017 Dec 14 04:58:13.106
25397 TECHSAT 1B (GO-32) [P] 5.989 3.804E-04 0.024 0.059 12.815
36099 DMSP 5D-3 F18 DEB [-] 6.000 2017 Dec 16 19:18:18.059 2017 Dec 16 19:18:18.449 2017 Dec 16 19:18:18.839
20737 COSMOS 2092 [?] 5.211 1.017E-03 0.016 0.068 0.474
21729 COSMOS 2158 [?] 5.208 2017 Dec 16 03:56:40.345 2017 Dec 16 03:56:50.899 2017 Dec 16 03:57:01.453
41922 IRIDIUM 104 [+] 2.383 3.511E-04 0.040 0.074 14.267
35038 COSMOS 2251 DEB [-] 3.123 2017 Dec 13 07:29:17.914 2017 Dec 13 07:29:18.265 2017 Dec 13 07:29:18.615
37792 APRIZESAT 5 [+] 0.768 3.100E-04 0.042 0.080 14.350
31608 FENGYUN 1C DEB [-] 1.249 2017 Dec 11 16:57:40.544 2017 Dec 11 16:57:40.892 2017 Dec 11 16:57:41.241
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)
08458 COSMOS 783 [?] 4.586 1.116E-03 0.028 0.080 11.603
26968 SL-16 DEB [-] 4.586 2017 Dec 15 11:52:52.837 2017 Dec 15 11:52:53.268 2017 Dec 15 11:52:53.698
25467 IRIDIUM 82 [-] 6.161 3.543E-03 0.030 0.085 11.640
32132 FENGYUN 1C DEB [-] 6.705 2017 Dec 17 01:31:21.543 2017 Dec 17 01:31:21.972 2017 Dec 17 01:31:22.402
24871 IRIDIUM 920 [-] 4.117 1.603E-03 0.052 0.108 13.847
39731 KAZEOSAT 1 [+] 4.251 2017 Dec 15 01:17:04.752 2017 Dec 15 01:17:05.113 2017 Dec 15 01:17:05.474
25415 ORBCOMM FM19 [+] 0.423 4.447E-04 0.060 0.115 14.143
28067 CZ-4B DEB [-] 0.900 2017 Dec 11 06:58:44.681 2017 Dec 11 06:58:45.035 2017 Dec 11 06:58:45.388
27451 IRIDIUM 98 [+] 5.359 2.614E-03 0.029 0.118 4.616
32194 FENGYUN 1C DEB [-] 8.270 2017 Dec 16 06:08:47.843 2017 Dec 16 06:08:48.926 2017 Dec 16 06:08:50.009

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 December 11 17:10:57 UTC