SOCRATES

Search Results


Search parameters:

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


Data current as of 2021 Jul 26 08:06 UTC

Computation Interval: Start = 2021 Jul 26 00:00:00.000, Stop = 2021 Aug 02 00:00:00.000
Computation Threshold: 5.0 km
Considering: 7,365 Primaries, 21,389 Secondaries (57,695 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 [+] 1.099 1.000E+00 0.000 0.000 0.000
48852 SHENZHOU-12 [+] 1.099 2021 Jul 26 00:00:00.000 2021 Jul 26 00:00:00.000 2021 Aug 02 00:00:00.000
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
44717 STARLINK-1011 [+] 0.351 1.428E-02 0.004 0.017 4.644
47845 STARLINK-2453 [+] 0.545 2021 Jul 26 03:06:44.293 2021 Jul 26 03:06:45.369 2021 Jul 26 03:06:46.446
47990 STARLINK-2307 [+] 4.597 4.251E-03 0.009 0.028 0.000
47992 STARLINK-2229 [+] 4.915 2021 Jul 30 11:50:23.415 2021 Jul 30 14:04:06.250 2021 Jul 30 16:30:44.428
46831 NUSAT-14 (HEDY) [+] 2.387 1.879E-03 0.018 0.030 14.946
32154 FENGYUN 1C DEB [-] 3.054 2021 Jul 28 06:30:11.161 2021 Jul 28 06:30:11.495 2021 Jul 28 06:30:11.830
48942 KSF1-C [+] 3.280 3.855E-03 0.009 0.030 9.760
45651 FREGAT DEB [-] 3.413 2021 Jul 29 01:16:11.507 2021 Jul 29 01:16:12.019 2021 Jul 29 01:16:12.532
16881 COSMOS 1766 [?] 2.634 4.293E-03 0.023 0.032 15.171
44405 LEMUR-2-DUSTINTHEWIND [+] 2.426 2021 Jul 28 07:22:18.011 2021 Jul 28 07:22:18.340 2021 Jul 28 07:22:18.670
44757 STARLINK-1034 [+] 6.018 3.696E-03 0.008 0.034 4.635
46576 STARLINK-1677 [+] 5.891 2021 Jul 31 13:17:40.036 2021 Jul 31 13:17:41.115 2021 Jul 31 13:17:42.194
22039 COSMOS 2202 [?] 2.170 3.468E-03 0.009 0.034 6.766
38044 GLOBALSTAR M090 [+] 2.324 2021 Jul 28 04:58:01.876 2021 Jul 28 04:58:02.615 2021 Jul 28 04:58:03.354
45098 STARLINK-1184 [+] 2.938 3.654E-03 0.008 0.034 4.644
47171 STARLINK-1888 [+] 3.000 2021 Jul 28 18:53:34.685 2021 Jul 28 18:53:35.762 2021 Jul 28 18:53:36.838

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.