SOCRATES

Top 10 Conjunctions
by Minimum Range

Data current as of 2008 Jul 04 12:00 UTC

Computation Interval: Start = 2008 Jul 04 12:00:00.000, Stop = 2008 Jul 11 12:00:00.000
Computation Threshold: 5.0 km
Considering: 2,896 Primaries, 11,557 Secondaries (10,738 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)
05557 OPS 4311 (DMSP 5B F1) 7.354 3.111E-04 0.049 0.069 14.308
22339 SL-16 DEB 8.425 2008 Jul 11 11:53:37.814 2008 Jul 11 11:53:38.164 2008 Jul 11 11:53:38.513
11735 COSMOS 1168 3.405 1.107E-03 0.071 0.100 12.606
24955 SL-8 R/B 3.891 2008 Jul 07 13:42:22.935 2008 Jul 07 13:42:23.332 2008 Jul 07 13:42:23.728
26032 ARIRANG 1 (KOMPSAT-1) 4.535 1.324E-04 0.075 0.105 14.853
31118 SAUDISAT 3 4.504 2008 Jul 08 16:50:46.198 2008 Jul 08 16:50:46.535 2008 Jul 08 16:50:46.871
08873 COSMOS 823 2.878 4.306E-04 0.075 0.106 14.607
21902 COSMOS 2181 1.969 2008 Jul 06 03:20:19.497 2008 Jul 06 03:20:19.839 2008 Jul 06 03:20:20.181
07490 METEOR 1-19 2.217 1.439E-03 0.078 0.110 13.531
31270 FENGYUN 1C DEB 4.549 2008 Jul 06 02:17:08.087 2008 Jul 06 02:17:08.457 2008 Jul 06 02:17:08.826
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)
13381 COSMOS 1394 8.257 7.805E-05 0.082 0.116 9.408
12263 DELTA 1 DEB 7.885 2008 Jul 11 11:16:09.791 2008 Jul 11 11:16:10.322 2008 Jul 11 11:16:10.853
28893 SINAH 1 6.100 1.002E-04 0.086 0.121 14.826
29728 FENGYUN 1C DEB 7.042 2008 Jul 10 05:50:31.624 2008 Jul 10 05:50:31.961 2008 Jul 10 05:50:32.298
32785 CUTE-1.7+APD II 6.739 2.387E-04 0.086 0.121 15.032
17192 SL-14 R/B 6.733 2008 Jul 10 03:17:32.789 2008 Jul 10 03:17:33.122 2008 Jul 10 03:17:33.454
25344 IRIDIUM 73 4.156 7.128E-04 0.094 0.133 14.950
08958 DELTA 1 DEB 4.639 2008 Jul 07 13:22:35.854 2008 Jul 07 13:22:36.188 2008 Jul 07 13:22:36.523
28654 NOAA 18 5.767 6.309E-05 0.108 0.153 7.073
04149 THORAD AGENA D DEB 4.972 2008 Jul 09 04:45:17.810 2008 Jul 09 04:45:18.516 2008 Jul 09 04:45:19.223
 
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.
TLE Data Space Data
Current
Archives
Documentation 		GPS
EOP
Space Weather
SATCAT Columns
Boxscore Software
SOCRATES
Dr. T.S. Kelso [TS.Kelso@celestrak.com]
Last updated: 2008 July 4 13:53:37 UTC
Accessed 30,429 times since 2000 December 16
Current system time: 2008 July 4 15:01:40 UTC