SOCRATES

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Search parameters:

  • Name(s): Top 10 by Time In
  • Order by Start Time
  • Return first 10 items


Data current as of 2018 Jun 21 08:06 UTC

Computation Interval: Start = 2018 Jun 21 00:00:00.000, Stop = 2018 Jun 28 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,241 Primaries, 17,004 Secondaries (24,239 Conjunctions)

See notes at bottom of page for data field descriptions

Bookmark this search (Top 10 by Time In)

Sort results by Maximum Probability, Minimum Range.

 
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)
43042 AEROCUBE 7B [+] 0.925 2.581E-03 0.010 0.041 0.000
43043 AEROCUBE 7C [+] 1.054 2018 Jun 21 00:00:00.000 2018 Jun 22 00:08:43.516 2018 Jun 26 18:41:04.559
16986 COSMOS 1782 [?] 0.042 4.761E-07 1.907 3.142 14.807
12465 SL-3 R/B [-] 0.123 2018 Jun 21 00:00:25.824 2018 Jun 21 00:00:26.087 2018 Jun 21 00:00:26.350
16495 COSMOS 1726 [?] -0.148 1.991E-07 1.921 2.720 15.201
37875 YAOGAN 12 [+] 0.094 2018 Jun 21 00:00:48.638 2018 Jun 21 00:00:48.914 2018 Jun 21 00:00:49.190
10731 COSMOS 994 [?] 0.076 1.365E-06 1.814 2.954 14.445
24678 SL-8 R/B [-] 0.489 2018 Jun 21 00:01:27.090 2018 Jun 21 00:01:27.369 2018 Jun 21 00:01:27.648
43461 GAOFEN-5 [+] 0.090 8.042E-08 2.720 4.750 14.541
22499 SL-16 DEB [-] 0.261 2018 Jun 21 00:01:59.261 2018 Jun 21 00:01:59.368 2018 Jun 21 00:01:59.476
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)
25106 IRIDIUM 47 [+] 0.118 2.215E-06 1.632 2.476 14.795
42401 NOAA 16 DEB [-] 0.478 2018 Jun 21 00:02:00.201 2018 Jun 21 00:02:00.495 2018 Jun 21 00:02:00.789
27424 AQUA [+] 0.073 1.024E-05 1.274 2.227 14.533
22499 SL-16 DEB [-] 0.261 2018 Jun 21 00:02:04.516 2018 Jun 21 00:02:04.824 2018 Jun 21 00:02:05.132
33434 CHUANGXIN 1-02 (CX-1-02) [+] -0.187 7.029E-07 0.881 1.680 14.150
30015 FENGYUN 1C DEB [-] 0.430 2018 Jun 21 00:02:08.403 2018 Jun 21 00:02:08.736 2018 Jun 21 00:02:09.069
10358 COSMOS 952 [?] -0.205 2.216E-06 1.132 4.651 3.873
42158 COSMOS 1275 DEB [-] 1.223 2018 Jun 21 00:02:31.120 2018 Jun 21 00:02:31.594 2018 Jun 21 00:02:32.068
25285 IRIDIUM 62 [+] 0.178 9.135E-05 0.351 0.560 14.676
19257 SL-8 R/B [-] 0.536 2018 Jun 21 00:02:40.079 2018 Jun 21 00:02:40.417 2018 Jun 21 00:02:40.756

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 21 16:26:06 UTC