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 Dec 01 06:06 UTC

Computation Interval: Start = 2021 Dec 01 00:00:00.000, Stop = 2021 Dec 08 00:00:00.000
Computation Threshold: 5.0 km
Considering: 7,589 Primaries, 21,882 Secondaries (59,596 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 [+] 0.769 1.000E+00 0.000 0.000 0.000
49222 TIANZHOU-3 [+] 0.769 2021 Dec 01 00:00:00.000 2021 Dec 01 00:00:00.000 2021 Dec 08 00:00:00.000
48803 TIANZHOU-2 [+] 0.769 1.000E+00 0.000 0.000 0.000
49326 SHENZHOU-13 (SZ-13) [+] 0.769 2021 Dec 01 00:00:00.000 2021 Dec 01 00:00:00.000 2021 Dec 08 00:00:00.000
49497 NASA DART [+] 6.730 1.000E+00 0.000 0.000 0.000
49498 FALCON 9 R/B [-] 6.730 2021 Dec 01 00:00:00.000 2021 Dec 01 00:00:00.000 2021 Dec 08 00:00:00.000
49222 TIANZHOU-3 [+] 0.769 1.000E+00 0.000 0.000 0.000
49326 SHENZHOU-13 (SZ-13) [+] 0.769 2021 Dec 01 00:00:00.000 2021 Dec 01 00:00:00.000 2021 Dec 08 00:00:00.000
08923 COSMOS 836 [?] 0.893 1.962E-01 0.002 0.006 1.388
43353 SL-16 DEB [-] 0.897 2021 Dec 01 14:57:46.738 2021 Dec 01 14:57:50.341 2021 Dec 01 14:57:53.943
45670 STARLINK-1453 [+] 6.493 1.414E-02 0.005 0.015 10.222
48106 STARLINK-2442 [+] 6.477 2021 Dec 07 09:14:51.514 2021 Dec 07 09:14:52.003 2021 Dec 07 09:14:52.492
46701 STARLINK-1801 [+] 6.979 1.588E-02 0.004 0.016 6.961
48116 STARLINK-2454 [+] 6.722 2021 Dec 07 11:01:24.688 2021 Dec 07 11:01:25.406 2021 Dec 07 11:01:26.124
46567 STARLINK-1741 [+] 7.014 1.170E-02 0.005 0.019 4.639
48663 STARLINK-2667 [+] 7.151 2021 Dec 07 17:13:13.722 2021 Dec 07 17:13:14.800 2021 Dec 07 17:13:15.878
40074 UKUBE-1 [+] 5.952 2.385E-03 0.015 0.029 14.380
44884 OBJECT F [+] 6.628 2021 Dec 06 20:52:37.284 2021 Dec 06 20:52:37.632 2021 Dec 06 20:52:37.979
49428 STARLINK-3121 [+] 4.410 3.109E-03 0.010 0.035 0.000
49431 STARLINK-3153 [+] 4.410 2021 Dec 05 02:29:37.225 2021 Dec 05 07:50:24.599 2021 Dec 05 11:41:08.670

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.