SOCRATES

Search Results


Search parameters:

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


Data current as of 2020 Sep 20 00:06 UTC

Computation Interval: Start = 2020 Sep 20 00:00:00.000, Stop = 2020 Sep 27 00:00:00.000
Computation Threshold: 5.0 km
Considering: 5,740 Primaries, 19,344 Secondaries (37,913 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)
26824 INTELSAT 901 (IS-901) [+] 0.845 1.000E+00 0.000 0.000 0.000
44625 MEV-1 [+] 0.845 2020 Sep 20 00:00:00.000 2020 Sep 20 00:00:00.000 2020 Sep 27 00:00:00.000
36798 ALSAT 2A [+] 4.520 2.659E-03 0.016 0.024 15.013
14222 SCOUT G-1 DEB [-] 4.806 2020 Sep 24 06:13:13.169 2020 Sep 24 06:13:13.502 2020 Sep 24 06:13:13.835
25344 IRIDIUM 73 [-] 4.011 1.581E-02 0.020 0.028 14.964
35262 ERS 1 DEB [-] 4.001 2020 Sep 23 12:13:34.043 2020 Sep 23 12:13:34.377 2020 Sep 23 12:13:34.711
43558 LEMUR-2-VU [+] 6.084 4.154E-03 0.009 0.028 11.262
32290 CZ-4C R/B [-] 6.058 2020 Sep 25 18:57:13.679 2020 Sep 25 18:57:14.123 2020 Sep 25 18:57:14.567
15944 COSMOS 1674 [?] 5.382 1.805E-03 0.018 0.032 14.724
41843 PINA 2A [+] 4.565 2020 Sep 24 11:38:29.191 2020 Sep 24 11:38:29.530 2020 Sep 24 11:38:29.870
10937 COSMOS 1020 [?] 3.803 8.062E-04 0.014 0.043 10.668
13763 COSMOS 1431 [?] 3.990 2020 Sep 23 09:04:35.635 2020 Sep 23 09:04:36.104 2020 Sep 23 09:04:36.572
04383 COSMOS 336 [?] 5.810 6.894E-04 0.022 0.054 12.097
07043 DELTA 1 DEB [-] 6.029 2020 Sep 25 04:41:52.161 2020 Sep 25 04:41:52.574 2020 Sep 25 04:41:52.987
45082 STARLINK-1160 [+] 6.666 8.893E-04 0.020 0.057 12.122
45580 STARLINK-1333 [+] 6.416 2020 Sep 26 05:58:39.944 2020 Sep 26 05:58:40.356 2020 Sep 26 05:58:40.768
43915 YUNHAI-2 6 [+] 2.413 5.135E-04 0.034 0.060 14.344
20912 CZ-4 DEB [-] 2.641 2020 Sep 22 03:44:46.762 2020 Sep 22 03:44:47.110 2020 Sep 22 03:44:47.459
06828 COSMOS 586 [?] 3.274 1.275E-03 0.023 0.071 10.936
16207 COSMOS 1375 DEB [-] 3.316 2020 Sep 22 20:23:15.228 2020 Sep 22 20:23:15.685 2020 Sep 22 20:23:16.142

10 records found

Data Fields:
  • Action: The Analysis button links to a page which provides a capability to build an interactive 3-D STK/CAT (Conjunction Analysis Tools) scenario detailing the conjunction.
  • 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.

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Dr. T.S. Kelso [TS.Kelso@celestrak.com]
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Last updated: 2020 Sep 20 03:28:04 UTC
Accessed 1 times since 2000 December 16
Current system time: 2020 Sep 20 11:08:25 UTC