SOCRATES

Search Results


Search parameters:

  • Name(s): Top 10 by Minimum Range
  • Order by Minimum Range
  • Return first 10 items


Data current as of 2019 Apr 21 00:06 UTC

Computation Interval: Start = 2019 Apr 21 00:00:00.000, Stop = 2019 Apr 28 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,601 Primaries, 17,393 Secondaries (26,936 Conjunctions)

See notes at bottom of page for data field descriptions

Re-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)
43756 SOYUZ-MS 11 [+] 1.485 1.000E+00 0.000 0.000 0.000
44188 CYGNUS NG-11 [+] 1.485 2019 Apr 21 00:00:00.000 2019 Apr 21 00:00:00.000 2019 Apr 28 00:00:00.000
44110 PROGRESS-MS 11 [+] 1.485 1.000E+00 0.000 0.000 0.000
44188 CYGNUS NG-11 [+] 1.485 2019 Apr 21 00:00:00.000 2019 Apr 21 00:00:00.000 2019 Apr 28 00:00:00.000
44069 SOYUZ-MS 12 [+] 1.485 1.000E+00 0.000 0.000 0.000
44188 CYGNUS NG-11 [+] 1.485 2019 Apr 21 00:00:00.000 2019 Apr 21 00:00:00.000 2019 Apr 28 00:00:00.000
43702 PROGRESS-MS 10 [+] 1.485 1.000E+00 0.000 0.000 0.000
44188 CYGNUS NG-11 [+] 1.485 2019 Apr 21 00:00:00.000 2019 Apr 21 00:00:00.000 2019 Apr 28 00:00:00.000
41727 GAOFEN 3 [+] 6.483 8.652E-03 0.005 0.022 3.304
25270 DELTA 1 DEB [-] 18.733 2019 Apr 27 04:40:05.329 2019 Apr 27 04:40:06.842 2019 Apr 27 04:40:08.354
31698 TERRASAR-X [+] 0.410 6.831E-03 0.006 0.025 0.000
36605 TANDEM-X [+] 0.483 2019 Apr 21 00:00:00.000 2019 Apr 21 05:54:56.154 2019 Apr 25 11:39:09.242
36036 SMOS [+] 7.005 3.469E-03 0.012 0.026 13.527
42301 DMSP 5D-2 F13 DEB [-] 7.185 2019 Apr 27 12:53:36.988 2019 Apr 27 12:53:37.357 2019 Apr 27 12:53:37.727
36795 CARTOSAT-2B [+] 1.916 4.377E-03 0.008 0.029 8.701
04190 THORAD AGENA D DEB [-] 2.861 2019 Apr 22 17:53:58.312 2019 Apr 22 17:53:58.887 2019 Apr 22 17:53:59.462
13241 COSMOS 1371 [?] 6.193 2.329E-03 0.027 0.039 14.829
38546 NOAA 12 DEB [-] 6.961 2019 Apr 26 07:13:30.589 2019 Apr 26 07:13:30.926 2019 Apr 26 07:13:31.264
02873 OPS 5712 (P/L 152) [?] 2.134 2.781E-03 0.029 0.045 14.646
23851 MSX [-] 2.460 2019 Apr 23 00:19:23.427 2019 Apr 23 00:19:23.769 2019 Apr 23 00:19:24.110

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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Last updated: 2019 Apr 21 01:40:17 UTC
Accessed 1 times since 2000 December 16
Current system time: 2019 Apr 21 06:22:56 UTC