SOCRATES

Search Results


Search parameters:

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


Data current as of 2018 Oct 17 16:06 UTC

Computation Interval: Start = 2018 Oct 17 12:00:00.000, Stop = 2018 Oct 24 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,284 Primaries, 17,023 Secondaries (24,636 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)
43493 SOYUZ-MS 09 [+] 0.992 1.000E+00 0.000 0.000 0.000
43630 HTV-7 (KOUNOTORI 7) [+] 0.992 2018 Oct 17 12:00:00.000 2018 Oct 17 12:00:00.000 2018 Oct 24 12:00:00.000
43537 PROGRESS-MS 09 [+] 0.992 1.000E+00 0.000 0.000 0.000
43630 HTV-7 (KOUNOTORI 7) [+] 0.992 2018 Oct 17 12:00:00.000 2018 Oct 17 12:00:00.000 2018 Oct 24 12:00:00.000
20436 SPOT 2 [-] 1.856 9.066E-02 0.012 0.019 14.898
33962 IRIDIUM 33 DEB [-] 2.622 2018 Oct 19 10:01:21.367 2018 Oct 19 10:01:21.703 2018 Oct 19 10:01:22.038
27430 HAIYANG-1A [?] 6.478 2.884E-03 0.015 0.024 14.560
35110 FENGYUN 1C DEB [-] 6.857 2018 Oct 24 00:18:01.483 2018 Oct 24 00:18:01.826 2018 Oct 24 00:18:02.170
15623 COSMOS 1641 [?] 3.974 6.328E-04 0.019 0.042 12.861
18120 COSMOS 1859 [?] 3.671 2018 Oct 20 14:04:23.096 2018 Oct 20 14:04:23.485 2018 Oct 20 14:04:23.873
31698 TERRASAR-X [+] 0.644 2.172E-03 0.011 0.045 0.000
36605 TANDEM-X [+] 0.644 2018 Oct 17 12:00:00.000 2018 Oct 18 03:10:41.710 2018 Oct 24 12:00:00.000
28369 SAUDICOMSAT 1 [+] 1.008 6.908E-04 0.030 0.050 14.617
30547 FENGYUN 1C DEB [-] 1.013 2018 Oct 17 20:43:27.450 2018 Oct 17 20:43:27.792 2018 Oct 17 20:43:28.135
03615 ESSA 8 (TOS-F) [-] 6.941 3.527E-03 0.013 0.052 6.091
20238 SL-14 R/B [-] 6.626 2018 Oct 23 20:22:29.632 2018 Oct 23 20:22:30.453 2018 Oct 23 20:22:31.274
06822 OPS 8314 (2) [?] 4.513 4.580E-04 0.030 0.054 13.703
06846 COSMOS 589 [?] 4.121 2018 Oct 21 02:13:59.368 2018 Oct 21 02:13:59.733 2018 Oct 21 02:14:00.098
24793 IRIDIUM 7 [-] 3.818 7.671E-03 0.021 0.055 12.516
13467 COSMOS 1275 DEB [-] 4.652 2018 Oct 21 08:56:13.415 2018 Oct 21 08:56:13.814 2018 Oct 21 08:56:14.214

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: 2018 Oct 17 17:29:02 UTC
Accessed 1 times since 2000 December 16
Current system time: 2018 Oct 17 19:02:47 UTC