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 2014 Jul 25 00:02 UTC

Computation Interval: Start = 2014 Jul 25 00:00:00.000, Stop = 2014 Aug 01 00:00:00.000
Computation Threshold: 5.0 km
Considering: 3,472 Primaries, 14,969 Secondaries (18,784 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)
27375 IRIDIUM 95 [+] 6.425 7.124E-02 0.008 0.030 14.632
22081 SL-8 R/B [-] 6.730 2014 Jul 30 21:11:15.741 2014 Jul 30 21:11:16.082 2014 Jul 30 21:11:16.424
05552 COSMOS 449 [?] 4.897 1.065E-03 0.013 0.053 13.211
06214 DELTA 1 DEB [-] 4.780 2014 Jul 28 06:15:09.450 2014 Jul 28 06:15:09.828 2014 Jul 28 06:15:10.207
26033 ACRIMSAT [-] 6.480 5.060E-04 0.038 0.055 1.440
32120 FENGYUN 1C DEB [-] 6.786 2014 Jul 31 01:56:41.396 2014 Jul 31 01:56:44.868 2014 Jul 31 01:56:48.340
27453 NOAA 17 [-] 3.036 4.747E-03 0.023 0.068 9.585
37389 X-SAT [+] 2.759 2014 Jul 27 12:28:38.953 2014 Jul 27 12:28:39.475 2014 Jul 27 12:28:39.997
24906 IRIDIUM 23 [S] 2.027 3.318E-03 0.033 0.082 7.589
34995 COSMOS 2251 DEB [-] 3.889 2014 Jul 26 10:44:33.818 2014 Jul 26 10:44:34.476 2014 Jul 26 10:44:35.135
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)
35868 TATIANA 2 [-] 2.536 1.786E-04 0.059 0.099 3.462
13474 COSMOS 1275 DEB [-] 2.318 2014 Jul 26 17:14:14.102 2014 Jul 26 17:14:15.546 2014 Jul 26 17:14:16.990
08519 METEOR 1-23 [?] 5.199 3.248E-03 0.030 0.126 14.798
37924 FENGYUN 1C DEB [-] 5.581 2014 Jul 28 09:12:31.322 2014 Jul 28 09:12:31.660 2014 Jul 28 09:12:31.998
39161 ESTCUBE 1 [+] 4.204 1.186E-04 0.067 0.131 5.100
29867 FENGYUN 1C DEB [-] 4.200 2014 Jul 28 20:42:51.738 2014 Jul 28 20:42:52.718 2014 Jul 28 20:42:53.698
24796 IRIDIUM 4 [-] 1.237 1.869E-03 0.034 0.139 14.294
00152 THOR ABLESTAR DEB [-] 2.316 2014 Jul 25 17:23:30.405 2014 Jul 25 17:23:30.755 2014 Jul 25 17:23:31.105
14401 COSMOS 1503 [?] 2.703 4.909E-04 0.035 0.143 14.185
35459 COSMOS 2251 DEB [-] 8.060 2014 Jul 27 01:54:56.226 2014 Jul 27 01:54:56.578 2014 Jul 27 01:54:56.931

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/TS.Kelso@centerforspace.com]
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Format last updated: 2014 May 16
Current system time: 2014 July 25 01:34:37 UTC