SOCRATES

Search Results


Search parameters:

  • Name(s): Top 10 by Maximum Probability
  • Order by Maximum Probability
  • Return first 10 items


Data current as of 2014 Apr 23 16:01 UTC

Computation Interval: Start = 2014 Apr 23 12:00:00.000, Stop = 2014 Apr 30 12:00:00.000
Computation Threshold: 5.0 km
Considering: 3,432 Primaries, 14,877 Secondaries (17,764 Conjunctions)

See notes at bottom of page for data field descriptions

Bookmark this search (Top 10 by Maximum Probability)

Sort results by Minimum Range, 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)
14506 OPS 1294 (DMSP 5D-2 F7) [?] 3.564 5.074E-03 0.007 0.027 12.537
29088 DMSP 5D-2 F11 DEB [-] 6.676 2014 Apr 26 22:06:50.348 2014 Apr 26 22:06:50.746 2014 Apr 26 22:06:51.145
31698 TERRASAR-X [+] 0.115 2.146E-03 0.011 0.045 0.001
36605 TANDEM-X [+] 0.529 2014 Apr 23 12:00:00.000 2014 Apr 23 13:58:10.218 2014 Apr 25 06:12:46.169
27424 AQUA [+] 3.924 1.719E-03 0.063 0.267 14.978
24529 PEGASUS DEB [-] 3.708 2014 Apr 26 18:50:10.254 2014 Apr 26 18:50:10.587 2014 Apr 26 18:50:10.921
10352 COSMOS 951 [?] 2.412 1.715E-03 0.052 0.122 6.975
26819 SL-8 R/B [-] 4.078 2014 Apr 25 14:17:13.975 2014 Apr 25 14:17:14.692 2014 Apr 25 14:17:15.408
24948 IRIDIUM 28 [-] 3.452 1.537E-03 0.038 0.153 14.074
39659 COSMOS 1867 COOLANT [-] 4.935 2014 Apr 26 20:36:36.401 2014 Apr 26 20:36:36.756 2014 Apr 26 20:36:37.111
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)
21688 IRS-1B [-] 3.244 1.391E-03 0.040 0.145 12.294
36353 METEOR 2-8 DEB [-] 6.408 2014 Apr 25 17:02:04.865 2014 Apr 25 17:02:05.272 2014 Apr 25 17:02:05.678
12504 COSMOS 1275 [?] 0.975 1.345E-03 0.044 0.184 14.566
16369 SL-8 R/B [-] 2.145 2014 Apr 23 16:07:56.759 2014 Apr 23 16:07:57.102 2014 Apr 23 16:07:57.445
07209 METEOR 1-16 [?] 0.450 1.304E-03 0.047 0.198 14.563
14464 DELTA 1 DEB [-] 1.034 2014 Apr 23 21:26:22.150 2014 Apr 23 21:26:22.493 2014 Apr 23 21:26:22.836
22590 COSMOS 2239 [?] 2.804 1.266E-03 0.029 0.111 12.852
08710 N-1 R/B [-] 3.682 2014 Apr 26 03:58:17.971 2014 Apr 26 03:58:18.360 2014 Apr 26 03:58:18.749
25106 IRIDIUM 47 [+] 5.465 1.240E-03 0.041 0.174 14.828
31456 FENGYUN 1C DEB [-] 8.523 2014 Apr 28 22:58:10.210 2014 Apr 28 22:58:10.547 2014 Apr 28 22:58:10.884

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.

TLE Data Space Data
Current
Archives
Documentation
GPS
EOP
Space Weather
SATCAT Columns
Boxscore Software
SOCRATES
Dr. T.S. Kelso [TS.Kelso@celestrak.com]
Follow CelesTrak on Twitter @TSKelso
Format last updated: 2009 May 26
Current system time: 2014 April 23 19:31:01 UTC