SOCRATES

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CelesTrak

Search parameters:

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


Data current as of 2021 Sep 24 00:06 UTC

Computation Interval: Start = 2021 Sep 24 00:00:00.000, Stop = 2021 Oct 01 00:00:00.000
Computation Threshold: 5.0 km
Considering: 7,484 Primaries, 21,543 Secondaries (65,138 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)
48803 TIANZHOU-2 [+] 1.325 1.000E+00 0.000 0.000 0.000
49222 TIANZHOU-3 [+] 1.325 2021 Sep 24 00:00:00.000 2021 Sep 24 00:00:00.000 2021 Oct 01 00:00:00.000
48274 TIANHE [+] 1.325 1.000E+00 0.000 0.000 0.000
49222 TIANZHOU-3 [+] 1.325 2021 Sep 24 00:00:00.000 2021 Sep 24 00:00:00.000 2021 Oct 01 00:00:00.000
44207 TIANHUI 2-01A [+] 4.268 1.642E-02 0.004 0.016 0.000
44209 TIANHUI 2-01B [+] 4.216 2021 Sep 24 00:00:00.000 2021 Sep 28 01:06:30.229 2021 Oct 01 00:00:00.000
44736 STARLINK-1031 [+] 5.559 8.296E-03 0.006 0.022 4.636
47787 STARLINK-2257 [+] 5.554 2021 Sep 29 02:26:17.736 2021 Sep 29 02:26:18.815 2021 Sep 29 02:26:19.893
47912 STARLINK-2372 [+] 5.808 6.102E-03 0.008 0.022 11.947
48665 STARLINK-2653 [+] 5.506 2021 Sep 29 08:08:41.332 2021 Sep 29 08:08:41.751 2021 Sep 29 08:08:42.169
44715 STARLINK-1009 [+] 5.554 5.684E-03 0.007 0.027 4.638
48572 STARLINK-2222 [+] 5.360 2021 Sep 29 00:40:53.523 2021 Sep 29 00:40:54.601 2021 Sep 29 00:40:55.679
47905 STARLINK-2365 [+] 1.685 5.218E-03 0.007 0.028 6.666
49007 OBJECT E [+] 1.458 2021 Sep 25 05:17:38.933 2021 Sep 25 05:17:39.684 2021 Sep 25 05:17:40.434
46356 STARLINK-1665 [+] 6.649 2.864E-03 0.009 0.038 4.647
46362 STARLINK-1726 [+] 5.924 2021 Sep 29 16:21:43.654 2021 Sep 29 16:21:44.730 2021 Sep 29 16:21:45.806
44733 STARLINK-1028 [+] 3.763 2.601E-03 0.010 0.040 4.637
48598 STARLINK-2256 [+] 3.298 2021 Sep 27 05:09:24.611 2021 Sep 27 05:09:25.689 2021 Sep 27 05:09:26.767
45178 STARLINK-1138 [+] 4.929 2.603E-03 0.010 0.040 4.646
48312 STARLINK-2061 [+] 4.791 2021 Sep 28 07:46:23.830 2021 Sep 28 07:46:24.906 2021 Sep 28 07:46:25.982

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.