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 2021 Jan 19 00:06 UTC

Computation Interval: Start = 2021 Jan 19 00:00:00.000, Stop = 2021 Jan 26 00:00:00.000
Computation Threshold: 5.0 km
Considering: 6,132 Primaries, 19,798 Secondaries (45,678 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)
47311 OBJECT C [+] 0.241 6.344E-07 0.622 2.638 0.003
47312 OBJECT D [+] 0.241 2021 Jan 19 00:00:00.000 2021 Jan 19 00:31:26.184 2021 Jan 19 15:21:11.778
39189 O3B FM4 [+] 0.809 2.504E-07 1.099 3.783 0.002
44114 O3B FM17 [+] 0.809 2021 Jan 19 00:00:00.000 2021 Jan 19 00:14:43.935 2021 Jan 19 00:49:52.189
43234 O3B FM13 [+] 0.547 6.428E-07 0.663 2.442 0.002
44113 O3B FM19 [+] 7.343 2021 Jan 19 00:00:00.000 2021 Jan 19 00:39:57.936 2021 Jan 19 01:20:08.597
44207 TIANHUI 2-01A [+] 0.259 4.116E-07 0.772 3.275 0.004
44209 TIANHUI 2-01B [+] 1.271 2021 Jan 19 00:00:00.000 2021 Jan 19 01:09:54.508 2021 Jan 19 19:05:59.260
44484 AEROCUBE 10B (DOUGSAT) [+] 0.485 2.143E-07 1.070 4.539 0.005
44485 AEROCUBE 10A (JIMSAT) [+] 0.418 2021 Jan 19 00:00:00.000 2021 Jan 19 00:00:00.000 2021 Jan 19 00:18:19.894
39267 DANDE [-] 0.257 1.317E-07 2.236 3.533 13.950
38455 OPS 4682 DEB [-] 0.758 2021 Jan 19 00:00:25.524 2021 Jan 19 00:00:25.778 2021 Jan 19 00:00:26.031
44749 STARLINK-1044 [+] 0.706 5.310E-07 0.766 2.558 9.921
46067 STARLINK-1529 [+] 0.256 2021 Jan 19 00:00:27.163 2021 Jan 19 00:00:27.596 2021 Jan 19 00:00:28.029
45212 STARLINK-1231 [+] 0.317 3.909E-07 0.800 3.328 3.136
45681 STARLINK-1396 [+] 0.247 2021 Jan 19 00:00:27.212 2021 Jan 19 00:00:28.402 2021 Jan 19 00:00:29.592
19274 OKEAN-1 [?] 0.707 1.820E-06 1.591 4.687 11.570
45661 STARLINK-1444 [+] 0.186 2021 Jan 19 00:00:29.581 2021 Jan 19 00:00:29.732 2021 Jan 19 00:00:29.882
00900 CALSPHERE 1 [+] 0.170 9.666E-07 1.543 2.396 14.455
18403 SL-8 R/B [-] 0.559 2021 Jan 19 00:00:47.910 2021 Jan 19 00:00:48.214 2021 Jan 19 00:00:48.518

10 records found

Data Fields:
  • Action: The TLE Data button links to a page which provides the TLEs used to generate the associated prediction.
  • 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.