SOCRATES

Search Results

Search parameters:

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

Data current as of 2010 Sep 08 12:01 UTC

Computation Interval: Start = 2010 Sep 08 12:00:00.000, Stop = 2010 Sep 15 12:00:00.000
Computation Threshold: 5.0 km
Considering: 3,055 Primaries, 14,589 Secondaries (16,811 Conjunctions)

See notes at bottom of page for data field descriptions

Bookmark this search (Top 10 by Minimum Range)

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)
25160 CELESTIS-02 & TAURUS R/B [?] 6.481 5.945E-03 0.012 0.018 1.299
12164 DELTA 1 DEB [-] 7.354 2010 Sep 13 22:27:00.950 2010 Sep 13 22:27:04.798 2010 Sep 13 22:27:08.646
06850 COSMOS 593 [?] 8.036 2.532E-03 0.009 0.034 12.403
21783 COSMOS 2169 [?] 8.322 2010 Sep 14 20:52:51.217 2010 Sep 14 20:52:51.621 2010 Sep 14 20:52:52.024
20442 LUSAT (LO-19) [P] 1.795 2.874E-04 0.023 0.075 10.634
00402 THOR ABLESTAR DEB [-] 2.710 2010 Sep 09 16:54:47.657 2010 Sep 09 16:54:48.128 2010 Sep 09 16:54:48.598
25108 IRIDIUM 49 [+] 5.833 5.708E-03 0.019 0.080 14.575
34024 COSMOS 2251 DEB [-] 5.933 2010 Sep 13 04:14:13.567 2010 Sep 13 04:14:13.910 2010 Sep 13 04:14:14.253
07209 METEOR 1-16 [?] 5.859 3.298E-03 0.045 0.082 4.090
33772 IRIDIUM 33 DEB [-] 5.821 2010 Sep 13 09:35:38.624 2010 Sep 13 09:35:39.846 2010 Sep 13 09:35:41.069
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)
15359 COSMOS 1605 [?] 5.729 2.180E-03 0.023 0.084 12.719
31692 FENGYUN 1C DEB [-] 9.524 2010 Sep 13 09:03:47.902 2010 Sep 13 09:03:48.295 2010 Sep 13 09:03:48.688
20322 COBE [?] 4.041 8.232E-04 0.061 0.092 1.855
30491 FENGYUN 1C DEB [-] 4.092 2010 Sep 11 02:12:59.277 2010 Sep 11 02:13:01.971 2010 Sep 11 02:13:04.666
23465 FAISAT [?] 3.292 9.318E-04 0.024 0.102 14.663
33737 FENGYUN 1C DEB [-] 2.976 2010 Sep 10 03:26:35.887 2010 Sep 10 03:26:36.228 2010 Sep 10 03:26:36.569
28376 AURA [+] 1.314 3.360E-04 0.027 0.114 14.940
34726 COSMOS 2251 DEB [-] 2.308 2010 Sep 09 02:33:31.825 2010 Sep 09 02:33:32.159 2010 Sep 09 02:33:32.494
24903 IRIDIUM 26 [+] 2.519 2.382E-03 0.030 0.125 14.602
34884 COSMOS 2251 DEB [-] 3.306 2010 Sep 09 22:31:27.459 2010 Sep 09 22:31:27.801 2010 Sep 09 22:31:28.143

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, with the following codes:
    • [+] = Operational
    • [-] = Nonoperational/Debris
    • [P] = Partially Operational
    • [B] = Backup/Standby
    • [S] = Spare
    • [?] = Unknown
  • 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 to one (AR=1, no orientation is necessary). 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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Format last updated: 2009 May 26
Current system time: 2010 September 09 00:48:54 UTC