SOCRATES

Top 10 Conjunctions
by Minimum Range

Data current as of 2009 Jul 04 12:00 UTC

Computation Interval: Start = 2009 Jul 04 12:00:00.000, Stop = 2009 Jul 11 12:00:00.000
Computation Threshold: 5.0 km
Considering: 2,973 Primaries, 13,393 Secondaries (14,731 Conjunctions)

See notes at bottom of page for data field descriptions

 
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)
16181 COSMOS 1697 7.660 2.851E-03 0.027 0.038 4.382
07493 SL-3 R/B 7.621 2009 Jun 01 04:30:19.655 2009 Jun 01 04:30:20.796 2009 Jun 01 04:30:21.937
13164 COSMOS 1361 4.184 4.041E-04 0.036 0.051 14.199
10833 DELTA 1 DEB 4.245 2009 May 28 20:12:59.679 2009 May 28 20:13:00.031 2009 May 28 20:13:00.383
10095 COSMOS 921 3.716 2.591E-04 0.053 0.075 13.686
14699 COSMOS 1536 3.352 2009 May 28 05:52:47.968 2009 May 28 05:52:48.333 2009 May 28 05:52:48.699
07265 COSMOS 641 4.726 1.584E-04 0.058 0.082 14.060
08084 DELTA 1 DEB 5.143 2009 May 29 22:24:20.119 2009 May 29 22:24:20.475 2009 May 29 22:24:20.830
07003 AUREOLE 2 5.905 1.081E-03 0.058 0.082 12.969
21876 SL-8 R/B 5.916 2009 May 31 00:24:05.703 2009 May 31 00:24:06.089 2009 May 31 00:24:06.474
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)
25396 TMSAT-1 (TO-31) 5.438 5.847E-04 0.059 0.083 14.910
13719 SL-3 R/B 5.880 2009 May 30 14:20:05.023 2009 May 30 14:20:05.359 2009 May 30 14:20:05.694
27436 COSMOS 2389 6.012 4.829E-04 0.060 0.085 10.835
02685 DIAMANT DEB 6.273 2009 May 31 01:21:28.946 2009 May 31 01:21:29.408 2009 May 31 01:21:29.869
03338 EXPLORER 40 (INJUN 5) 7.551 2.037E-04 0.060 0.085 5.154
30473 FENGYUN 1C DEB 8.118 2009 Jun 01 12:45:26.448 2009 Jun 01 12:45:27.418 2009 Jun 01 12:45:28.388
13375 COSMOS 1388 7.575 1.113E-04 0.069 0.097 10.810
07133 DELTA 1 DEB 8.400 2009 Jun 01 13:27:31.599 2009 Jun 01 13:27:32.062 2009 Jun 01 13:27:32.524
20438 UOSAT 4 (UO-15) 5.967 1.840E-04 0.070 0.099 9.336
33760 COSMOS 2251 DEB 6.442 2009 May 31 02:05:37.164 2009 May 31 02:05:37.700 2009 May 31 02:05:38.235
 
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.
  • Days Since Epoch: The number of days from the epoch of the NORAD two-line element set 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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Last updated: 2009 May 26 13:17:41 UTC
Accessed 39,455 times since 2000 December 16
Current system time: 2009 July 5 01:57:32 UTC