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 Dec 12 00:05 UTC

Computation Interval: Start = 2017 Dec 12 00:00:00.000, Stop = 2017 Dec 19 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,141 Primaries, 16,756 Secondaries (23,422 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)
05557 OPS 4311 (DMSP 5B F1) [-] 2.190 1.563E-02 0.005 0.015 10.105
31311 FENGYUN 1C DEB [-] 2.048 2017 Dec 13 15:16:39.655 2017 Dec 13 15:16:40.150 2017 Dec 13 15:16:40.645
19909 COSMOS 2015 [?] 4.750 6.602E-04 0.027 0.042 14.089
07139 DELTA 1 DEB [-] 5.361 2017 Dec 16 15:01:26.558 2017 Dec 16 15:01:26.913 2017 Dec 16 15:01:27.268
41922 IRIDIUM 104 [+] 1.895 9.139E-04 0.025 0.046 14.267
35038 COSMOS 2251 DEB [-] 2.129 2017 Dec 13 07:29:17.924 2017 Dec 13 07:29:18.275 2017 Dec 13 07:29:18.625
40378 FIREBIRD 4 [+] 5.787 8.063E-04 0.023 0.057 12.938
31298 FENGYUN 1C DEB [-] 6.207 2017 Dec 17 14:50:14.922 2017 Dec 17 14:50:15.309 2017 Dec 17 14:50:15.695
27847 CANX-1 [-] 2.645 3.565E-04 0.045 0.065 14.796
29047 FORMOSAT-3 FM6 [+] 2.584 2017 Dec 14 04:58:12.419 2017 Dec 14 04:58:12.757 2017 Dec 14 04:58:13.095
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)
05217 COSMOS 418 [?] 7.519 3.005E-04 0.038 0.068 13.767
21729 COSMOS 2158 [?] 7.419 2017 Dec 18 21:44:22.845 2017 Dec 18 21:44:23.208 2017 Dec 18 21:44:23.571
24871 IRIDIUM 920 [-] 3.561 3.409E-03 0.036 0.074 13.847
39731 KAZEOSAT 1 [+] 3.210 2017 Dec 15 01:17:04.764 2017 Dec 15 01:17:05.125 2017 Dec 15 01:17:05.486
43043 OBJECT G [+] 6.665 7.007E-04 0.019 0.079 0.005
43053 OBJECT S [+] 6.015 2017 Dec 17 19:45:45.297 2017 Dec 17 19:59:34.654 2017 Dec 17 20:13:09.868
42890 FLOCK 2K-15 [+] 0.959 2.870E-04 0.039 0.092 13.431
40354 SL-27 R/B [-] 1.219 2017 Dec 12 18:45:17.103 2017 Dec 12 18:45:17.475 2017 Dec 12 18:45:17.847
40699 COSMOS 2506 [+] 1.429 1.674E-04 0.064 0.097 14.816
13482 COSMOS 1275 DEB [-] 2.035 2017 Dec 13 03:40:27.504 2017 Dec 13 03:40:27.842 2017 Dec 13 03:40:28.179

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 December 12 02:24:41 UTC