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 18 16:05 UTC

Computation Interval: Start = 2018 Jun 18 12:00:00.000, Stop = 2018 Jun 25 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,243 Primaries, 17,011 Secondaries (24,300 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)
43471 LONGJIANG 1 [-] 28.530 1.000E+00 0.000 0.000 0.000
43472 LONGJIANG 2 [-] 28.530 2018 Jun 18 12:00:00.000 2018 Jun 18 12:00:00.000 2018 Jun 25 12:00:00.000
43470 QUEQIAO [-] 28.530 1.000E+00 0.000 0.000 0.000
43471 LONGJIANG 1 [-] 28.530 2018 Jun 18 12:00:00.000 2018 Jun 18 12:00:00.000 2018 Jun 25 12:00:00.000
43470 QUEQIAO [-] 28.530 1.000E+00 0.000 0.000 0.000
43472 LONGJIANG 2 [-] 28.530 2018 Jun 18 12:00:00.000 2018 Jun 18 12:00:00.000 2018 Jun 25 12:00:00.000
13067 COSMOS 1340 [?] 1.133 8.553E-03 0.009 0.013 15.215
43440 ZHUHAI-1 OVS-02 [+] 0.398 2018 Jun 18 21:35:03.050 2018 Jun 18 21:35:03.378 2018 Jun 18 21:35:03.707
43042 AEROCUBE 7B [+] 2.451 2.202E-02 0.003 0.014 0.000
43043 AEROCUBE 7C [+] 2.646 2018 Jun 18 12:00:00.000 2018 Jun 20 13:04:45.177 2018 Jun 24 11:16:52.419
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)
20607 MACSAT 1 (M 1) [?] 0.699 2.251E-03 0.032 0.058 14.348
34511 IRIDIUM 33 DEB [-] 0.822 2018 Jun 19 05:17:00.230 2018 Jun 19 05:17:00.578 2018 Jun 19 05:17:00.927
43466 UBAKUSAT [+] 1.872 1.006E-03 0.016 0.066 0.002
43467 1KUNS-PF [+] 1.878 2018 Jun 19 17:30:53.226 2018 Jun 19 21:48:48.328 2018 Jun 19 22:21:41.803
20608 MACSAT 2 (M 2) [?] 0.623 3.036E-03 0.019 0.072 7.502
26474 TITAN 4B R/B [-] 0.014 2018 Jun 18 13:18:49.264 2018 Jun 18 13:18:49.931 2018 Jun 18 13:18:50.597
06123 COSMOS 510 [?] 2.308 2.369E-04 0.029 0.073 12.076
12323 COSMOS 1253 [?] 2.850 2018 Jun 20 17:48:45.357 2018 Jun 20 17:48:45.771 2018 Jun 20 17:48:46.185
10585 COSMOS 978 [?] 5.908 2.068E-04 0.033 0.074 12.795
20556 COSMOS 2071 [?] 6.146 2018 Jun 23 17:11:52.653 2018 Jun 23 17:11:53.044 2018 Jun 23 17:11:53.435

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 18 21:14:03 UTC