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 Oct 19 00:06 UTC

Computation Interval: Start = 2021 Oct 19 00:00:00.000, Stop = 2021 Oct 26 00:00:00.000
Computation Threshold: 5.0 km
Considering: 7,531 Primaries, 21,589 Secondaries (62,187 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 [+] 0.623 1.000E+00 0.000 0.000 0.000
49326 SHENZHOU-13 (SZ-13) [+] 0.623 2021 Oct 19 00:00:00.000 2021 Oct 19 00:00:00.000 2021 Oct 26 00:00:00.000
48803 TIANZHOU-2 [+] 0.623 1.000E+00 0.000 0.000 0.000
49222 TIANZHOU-3 [+] 0.623 2021 Oct 19 00:00:00.000 2021 Oct 19 00:00:00.000 2021 Oct 26 00:00:00.000
49328 LUCY [+] 2.592 1.000E+00 0.000 0.000 0.000
49329 ATLAS 5 CENTAUR R/B [-] 2.592 2021 Oct 19 00:00:00.000 2021 Oct 19 00:00:00.000 2021 Oct 26 00:00:00.000
49222 TIANZHOU-3 [+] 0.623 1.000E+00 0.000 0.000 0.000
49326 SHENZHOU-13 (SZ-13) [+] 0.623 2021 Oct 19 00:00:00.000 2021 Oct 19 00:00:00.000 2021 Oct 26 00:00:00.000
47747 STARLINK-2161 [+] 6.251 3.354E-01 0.001 0.003 4.153
48093 STARLINK-2404 [+] 6.454 2021 Oct 24 12:19:37.651 2021 Oct 24 12:19:38.855 2021 Oct 24 12:19:40.059
46082 STARLINK-1578 [+] 5.189 2.871E-02 0.003 0.012 4.646
47675 STARLINK-2078 [+] 5.194 2021 Oct 23 19:05:00.206 2021 Oct 23 19:05:01.282 2021 Oct 23 19:05:02.358
45188 STARLINK-1228 [+] 5.791 1.954E-02 0.004 0.014 4.643
47643 STARLINK-2022 [+] 5.919 2021 Oct 24 06:22:24.812 2021 Oct 24 06:22:25.889 2021 Oct 24 06:22:26.966
49320 OBJECT F [+] 3.592 1.650E-02 0.004 0.016 0.001
49321 OBJECT G [+] 3.658 2021 Oct 19 00:00:00.000 2021 Oct 22 09:12:36.363 2021 Oct 23 20:42:26.352
25309 GLOBALSTAR M008 [-] 4.484 7.444E-02 0.009 0.016 13.782
18647 DELTA 1 DEB [-] 6.542 2021 Oct 23 00:37:40.099 2021 Oct 23 00:37:40.462 2021 Oct 23 00:37:40.825
44484 AEROCUBE 10B (DOUGSAT) [+] 2.102 1.032E-02 0.005 0.020 0.000
44485 AEROCUBE 10A (JIMSAT) [+] 3.731 2021 Oct 19 00:00:00.000 2021 Oct 20 06:01:20.662 2021 Oct 23 08:18:33.608

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.