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 Mar 26 16:05 UTC

Computation Interval: Start = 2017 Mar 26 12:00:00.000, Stop = 2017 Apr 02 12:00:00.000
Computation Threshold: 5.0 km
Considering: 3,906 Primaries, 15,931 Secondaries (21,537 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)
38078 ALMASAT-1 [-] 1.042 1.591E-03 0.015 0.043 11.713
14866 SL-8 DEB [-] 1.181 2017 Mar 26 23:16:21.044 2017 Mar 26 23:16:21.470 2017 Mar 26 23:16:21.897
39419 DUBAISAT-2 [+] 5.953 7.325E-04 0.029 0.048 14.782
40023 FLOCK 1C-10 [+] 6.093 2017 Mar 31 19:20:41.352 2017 Mar 31 19:20:41.690 2017 Mar 31 19:20:42.028
25756 KITSAT 3 [-] 4.971 6.649E-04 0.014 0.052 7.411
33954 IRIDIUM 33 DEB [-] 4.872 2017 Mar 30 18:07:47.620 2017 Mar 30 18:07:48.294 2017 Mar 30 18:07:48.969
20441 WEBERSAT (WO-18) [-] 2.490 4.629E-04 0.019 0.056 11.529
39892 SL-16 DEB [-] 6.789 2017 Mar 28 07:15:12.688 2017 Mar 28 07:15:13.121 2017 Mar 28 07:15:13.555
41981 FLOCK 3P-73 [+] 1.626 1.192E-03 0.014 0.061 0.002
42023 FLOCK 3P-32 [+] 1.626 2017 Mar 26 12:00:00.000 2017 Mar 27 10:22:10.375 2017 Apr 02 12:00:00.000
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)
01952 OPS 1593 (TRANSIT 11) [?] 3.786 9.983E-04 0.027 0.068 12.609
30573 FENGYUN 1C DEB [-] 3.546 2017 Mar 29 09:47:29.869 2017 Mar 29 09:47:30.265 2017 Mar 29 09:47:30.662
40037 PERSEUS-M2 [+] 6.178 7.512E-04 0.048 0.069 15.061
16263 SL-14 R/B [-] 6.236 2017 Apr 01 00:31:15.160 2017 Apr 01 00:31:15.492 2017 Apr 01 00:31:15.823
25480 ORBCOMM FM26 [-] 1.280 1.355E-03 0.032 0.070 13.612
31166 FENGYUN 1C DEB [-] 3.770 2017 Mar 27 03:37:57.303 2017 Mar 27 03:37:57.670 2017 Mar 27 03:37:58.037
26932 SAPPHIRE (NO-45) [-] 1.319 3.250E-04 0.046 0.073 14.582
33728 FENGYUN 1C DEB [-] 3.236 2017 Mar 27 06:00:09.143 2017 Mar 27 06:00:09.486 2017 Mar 27 06:00:09.829
04259 OPS 7613 (P/L 3) [?] 2.082 2.336E-04 0.055 0.082 14.678
31483 FENGYUN 1C DEB [-] 1.865 2017 Mar 27 15:16:28.376 2017 Mar 27 15:16:28.716 2017 Mar 27 15:16:29.057

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 March 26 18:58:45 UTC