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 May 01 00:05 UTC

Computation Interval: Start = 2017 May 01 00:00:00.000, Stop = 2017 May 08 00:00:00.000
Computation Threshold: 5.0 km
Considering: 3,906 Primaries, 16,450 Secondaries (22,097 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)
42056 PROGRESS-MS 05 [+] 1.438 1.000E+00 0.000 0.000 0.000
42681 CYGNUS OA-7 [+] 1.438 2017 May 01 00:00:00.000 2017 May 01 00:00:00.000 2017 May 08 00:00:00.000
41864 SOYUZ-MS 03 [+] 1.438 1.000E+00 0.000 0.000 0.000
42681 CYGNUS OA-7 [+] 1.438 2017 May 01 00:00:00.000 2017 May 01 00:00:00.000 2017 May 08 00:00:00.000
41864 SOYUZ-MS 03 [+] 1.438 1.000E+00 0.000 0.000 0.000
42682 SOYUZ MS-04 [+] 1.438 2017 May 01 00:00:00.000 2017 May 01 00:00:00.000 2017 May 08 00:00:00.000
42681 CYGNUS OA-7 [+] 1.438 1.000E+00 0.000 0.000 0.000
42682 SOYUZ MS-04 [+] 1.438 2017 May 01 00:00:00.000 2017 May 01 00:00:00.000 2017 May 08 00:00:00.000
42056 PROGRESS-MS 05 [+] 1.438 1.000E+00 0.000 0.000 0.000
42682 SOYUZ MS-04 [+] 1.438 2017 May 01 00:00:00.000 2017 May 01 00:00:00.000 2017 May 08 00:00:00.000
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)
27842 DTUSAT [-] 1.882 5.016E-03 0.007 0.030 0.000
27846 AAU CUBESAT [-] 1.671 2017 May 01 00:00:00.000 2017 May 01 08:53:41.843 2017 May 05 00:26:55.245
25544 ISS (ZARYA) [+] 1.398 1.167E-01 0.011 0.043 0.000
42681 CYGNUS OA-7 [+] 1.733 2017 May 01 00:00:00.000 2017 May 01 07:05:45.118 2017 May 04 17:38:24.304
25544 ISS (ZARYA) [+] 1.398 1.167E-01 0.011 0.043 0.000
42682 SOYUZ MS-04 [+] 1.733 2017 May 01 00:00:00.000 2017 May 01 07:05:45.118 2017 May 04 17:38:24.304
27944 LARETS [?] 5.456 1.311E-03 0.017 0.048 11.538
41461 ASAP-S [-] 5.444 2017 May 05 09:37:30.920 2017 May 05 09:37:31.353 2017 May 05 09:37:31.786
12987 COSMOS 1328 [?] 4.648 6.034E-04 0.035 0.049 15.238
30486 FENGYUN 1C DEB [-] 5.088 2017 May 04 13:12:29.729 2017 May 04 13:12:30.057 2017 May 04 13:12:30.385

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 May 01 02:23:35 UTC