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 Sep 23 00:05 UTC

Computation Interval: Start = 2018 Sep 23 00:00:00.000, Stop = 2018 Sep 30 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,285 Primaries, 17,011 Secondaries (24,777 Conjunctions)

See notes at bottom of page for data field descriptions

Re-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)
31698 TERRASAR-X [+] 0.718 2.453E-06 0.316 1.341 0.002
36605 TANDEM-X [+] 0.718 2018 Sep 23 00:00:00.000 2018 Sep 23 00:39:29.758 2018 Sep 24 23:09:05.386
07476 COSMOS 689 [?] 0.413 1.671E-07 2.982 4.254 14.629
41346 NOAA 16 DEB [-] 1.137 2018 Sep 23 00:00:18.514 2018 Sep 23 00:00:18.694 2018 Sep 23 00:00:18.874
17303 COSMOS 1814 [?] 0.438 1.927E-07 2.990 4.286 14.938
30831 FENGYUN 1C DEB [-] 1.333 2018 Sep 23 00:00:24.197 2018 Sep 23 00:00:24.370 2018 Sep 23 00:00:24.542
39191 O3B PFM [+] 0.468 3.857E-07 0.873 3.094 0.002
43234 O3B FM13 [+] 0.468 2018 Sep 23 00:00:28.769 2018 Sep 23 00:27:30.454 2018 Sep 23 00:58:59.706
25160 CELESTIS-02 & TAURUS R/B [+] 0.638 2.149E-07 1.358 4.576 9.522
31468 FENGYUN 1C DEB [-] 2.589 2018 Sep 23 00:00:40.415 2018 Sep 23 00:00:40.627 2018 Sep 23 00:00:40.839
40137 CHUANGXIN 1-04 (CX-1-04) [+] 0.493 8.114E-08 2.980 4.297 14.898
37284 COSMOS 2251 DEB [-] 2.793 2018 Sep 23 00:00:46.780 2018 Sep 23 00:00:46.952 2018 Sep 23 00:00:47.123
40072 SKYSAT-2 [+] 0.624 9.718E-07 0.967 2.630 12.282
15370 SL-14 R/B [-] 0.420 2018 Sep 23 00:01:45.175 2018 Sep 23 00:01:45.521 2018 Sep 23 00:01:45.868
40909 XW-2E [-] 0.477 6.910E-07 0.659 2.285 9.314
43441 ZHUHAI-1 OHS-02 [+] 0.469 2018 Sep 23 00:02:13.601 2018 Sep 23 00:02:14.078 2018 Sep 23 00:02:14.556
40021 DUCHIFAT-1 [+] 0.390 1.161E-07 2.025 4.425 13.769
42403 NOAA 16 DEB [-] 1.145 2018 Sep 23 00:02:27.452 2018 Sep 23 00:02:27.621 2018 Sep 23 00:02:27.790
28810 REIMEI (INDEX) [+] 0.453 2.986E-07 0.944 3.692 6.176
39432 ICUBE-1 [-] 0.790 2018 Sep 23 00:02:31.892 2018 Sep 23 00:02:32.438 2018 Sep 23 00:02:32.984

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: 2018 Sep 23 01:31:14 UTC
Accessed 1 times since 2000 December 16
Current system time: 2018 Sep 23 08:04:39 UTC