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 Aug 16 16:06 UTC

Computation Interval: Start = 2017 Aug 16 12:00:00.000, Stop = 2017 Aug 23 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,069 Primaries, 16,641 Secondaries (22,462 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)
25756 KITSAT 3 [-] 3.356 1.537E-03 0.010 0.032 10.575
33965 IRIDIUM 33 DEB [-] 2.676 2017 Aug 19 04:09:04.674 2017 Aug 19 04:09:05.147 2017 Aug 19 04:09:05.620
40136 LING QIAO [+] 1.093 8.466E-04 0.017 0.072 2.247
40254 IRIDIUM 47 DEB [-] 4.272 2017 Aug 17 11:59:14.967 2017 Aug 17 11:59:17.191 2017 Aug 17 11:59:19.416
41181 ORBCOMM FM105 [+] 7.263 3.853E-04 0.035 0.078 13.496
34870 IRIDIUM 33 DEB [-] 7.743 2017 Aug 23 04:19:01.455 2017 Aug 23 04:19:01.825 2017 Aug 23 04:19:02.196
42021 FLOCK 3P-84 [+] 2.382 7.059E-04 0.019 0.079 0.007
42022 FLOCK 3P-59 [+] 2.382 2017 Aug 18 06:33:49.176 2017 Aug 18 06:47:49.523 2017 Aug 18 07:01:53.788
31133 AEROCUBE 2 [-] 5.166 2.162E-04 0.056 0.086 14.727
34732 COSMOS 2251 DEB [-] 6.654 2017 Aug 21 00:02:19.112 2017 Aug 21 00:02:19.452 2017 Aug 21 00:02:19.791
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)
13991 COSMOS 1452 [?] 4.031 9.402E-04 0.048 0.100 13.763
14240 COSMOS 1486 [?] 3.704 2017 Aug 19 21:43:33.095 2017 Aug 19 21:43:33.458 2017 Aug 19 21:43:33.822
42701 SOMP 2 [+] 6.186 4.190E-04 0.024 0.103 0.004
42708 QBEE50-LTU-OC [+] 6.186 2017 Aug 22 16:10:49.456 2017 Aug 22 16:27:59.488 2017 Aug 22 16:45:31.329
19038 COSMOS 1937 [?] 1.545 3.939E-04 0.059 0.106 14.317
33971 COSMOS 2251 DEB [-] 1.445 2017 Aug 17 05:32:28.447 2017 Aug 17 05:32:28.796 2017 Aug 17 05:32:29.145
38340 HORYU 2 [+] 7.590 1.283E-04 0.075 0.108 15.055
34300 COSMOS 2251 DEB [-] 7.861 2017 Aug 23 11:53:13.247 2017 Aug 23 11:53:13.579 2017 Aug 23 11:53:13.911
23827 IRS-P3 [-] 5.358 1.235E-03 0.059 0.112 14.126
42414 NOAA 16 DEB [-] 6.144 2017 Aug 21 05:33:39.235 2017 Aug 21 05:33:39.589 2017 Aug 21 05:33:39.943

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 August 16 19:38:11 UTC