SOCRATES

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Search parameters:

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


Data current as of 2021 Jul 26 16:06 UTC

Computation Interval: Start = 2021 Jul 26 12:00:00.000, Stop = 2021 Aug 02 12:00:00.000
Computation Threshold: 5.0 km
Considering: 7,365 Primaries, 21,390 Secondaries (58,600 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 [+] 1.599 1.000E+00 0.000 0.000 0.000
48852 SHENZHOU-12 [+] 1.599 2021 Jul 26 12:00:00.000 2021 Jul 26 12:00:00.000 2021 Aug 02 12:00:00.000
48014 STARLINK-2283 [+] 3.390 3.129E-02 0.003 0.011 0.001
48016 STARLINK-2284 [+] 3.898 2021 Jul 29 14:12:13.819 2021 Jul 29 16:38:39.392 2021 Jul 29 17:16:52.159
46152 STARLINK-1634 [+] 5.303 3.214E-02 0.003 0.011 6.209
43834 OBJECT D [-] 4.813 2021 Jul 31 09:08:35.920 2021 Jul 31 09:08:36.725 2021 Jul 31 09:08:37.531
45182 STARLINK-1201 [+] 7.151 2.104E-02 0.003 0.014 4.636
47658 STARLINK-2042 [+] 7.080 2021 Aug 01 23:25:48.723 2021 Aug 01 23:25:49.802 2021 Aug 01 23:25:50.880
47987 STARLINK-2311 [+] 5.964 1.142E-02 0.005 0.019 0.001
47990 STARLINK-2307 [+] 6.282 2021 Aug 01 05:42:30.003 2021 Aug 01 06:30:39.541 2021 Aug 01 08:46:35.760
47896 STARLINK-2356 [+] 5.092 8.228E-03 0.005 0.023 0.529
47908 STARLINK-2368 [+] 5.092 2021 Jul 31 11:06:48.277 2021 Jul 31 11:06:57.734 2021 Jul 31 11:07:07.192
16881 COSMOS 1766 [?] 1.773 4.278E-03 0.023 0.032 15.171
44405 LEMUR-2-DUSTINTHEWIND [+] 2.426 2021 Jul 28 07:22:18.016 2021 Jul 28 07:22:18.345 2021 Jul 28 07:22:18.675
47559 STARLINK-1958 [+] 5.129 2.594E-03 0.010 0.039 6.963
47654 STARLINK-2038 [+] 4.657 2021 Jul 31 00:14:23.092 2021 Jul 31 00:14:23.810 2021 Jul 31 00:14:24.528
46080 STARLINK-1568 [+] 4.327 2.673E-03 0.010 0.040 4.646
47643 STARLINK-2022 [+] 4.862 2021 Jul 30 17:59:17.632 2021 Jul 30 17:59:18.708 2021 Jul 30 17:59:19.784
45207 STARLINK-1210 [+] 5.460 2.487E-03 0.010 0.041 4.645
47628 STARLINK-1973 [+] 5.853 2021 Jul 31 06:23:01.065 2021 Jul 31 06:23:02.142 2021 Jul 31 06:23:03.218

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.