SOCRATES

Search Results


Search parameters:

  • Name(s): Top 10 by Minimum Range
  • Order by Minimum Range
  • Return first 10 items


Data current as of 2020 Nov 29 16:06 UTC

Computation Interval: Start = 2020 Nov 29 12:00:00.000, Stop = 2020 Dec 06 12:00:00.000
Computation Threshold: 5.0 km
Considering: 5,994 Primaries, 19,801 Secondaries (38,013 Conjunctions)

See notes at bottom of page for data field descriptions

Re-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)
40137 CHUANGXIN 1-04 (CX-1-04) [+] 5.544 1.031E-02 0.006 0.016 12.727
35378 CZ-4 DEB [-] 5.908 2020 Dec 05 01:09:49.032 2020 Dec 05 01:09:49.425 2020 Dec 05 01:09:49.818
31698 TERRASAR-X [+] 0.280 7.845E-03 0.006 0.024 0.000
36605 TANDEM-X [+] 0.146 2020 Nov 29 12:00:00.000 2020 Nov 29 17:14:01.301 2020 Dec 01 03:05:27.036
45058 STARLINK-1162 [+] 2.908 1.120E-03 0.020 0.046 13.652
31663 FENGYUN 1C DEB [-] 2.705 2020 Dec 01 04:34:00.456 2020 Dec 01 04:34:00.822 2020 Dec 01 04:34:01.188
44484 AEROCUBE 10B (DOUGSAT) [+] 5.285 1.788E-03 0.012 0.050 0.000
44485 AEROCUBE 10A (JIMSAT) [+] 5.285 2020 Dec 03 16:03:43.834 2020 Dec 04 17:39:50.523 2020 Dec 05 19:59:54.995
38860 SJ-9A [+] 5.990 7.991E-04 0.022 0.058 12.587
01646 TITAN 3C TRANSTAGE DEB [-] 7.109 2020 Dec 05 11:32:46.056 2020 Dec 05 11:32:46.453 2020 Dec 05 11:32:46.851
45228 STARLINK-1222 [+] 4.638 4.619E-04 0.034 0.066 14.355
30483 FENGYUN 1C DEB [-] 4.698 2020 Dec 04 02:47:59.887 2020 Dec 04 02:48:00.236 2020 Dec 04 02:48:00.584
09022 COSMOS 841 [?] 3.351 1.980E-03 0.034 0.066 14.085
10520 COSMOS 968 [?] 3.093 2020 Dec 01 22:44:14.959 2020 Dec 01 22:44:15.314 2020 Dec 01 22:44:15.669
25398 WESTPAC [-] 6.162 1.183E-04 0.041 0.068 14.528
41363 NOAA 16 DEB [-] 5.622 2020 Dec 04 17:53:10.578 2020 Dec 04 17:53:10.922 2020 Dec 04 17:53:11.266
46040 STARLINK-1576 [+] 4.334 7.357E-04 0.019 0.075 5.126
46534 STARLINK-1659 [+] 3.542 2020 Dec 03 03:00:20.204 2020 Dec 03 03:00:21.179 2020 Dec 03 03:00:22.154
44941 STARLINK-1094 [+] 6.155 5.563E-04 0.024 0.076 10.876
46459 JILIN-01 GAOFEN 3G [+] 5.790 2020 Dec 05 05:10:10.746 2020 Dec 05 05:10:11.206 2020 Dec 05 05:10:11.666

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.