SOCRATES

Search Results


Search parameters:

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


Data current as of 2017 May 29 08:06 UTC

Computation Interval: Start = 2017 May 29 00:00:00.000, Stop = 2017 Jun 05 00:00:00.000
Computation Threshold: 5.0 km
Considering: 3,942 Primaries, 16,463 Secondaries (22,445 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)
42731 I-INSPIRE II [+] 2.234 6.331E-03 0.006 0.026 0.000
42732 POLYITAN-2-SAU [+] 2.299 2017 May 29 00:00:00.000 2017 May 30 18:48:24.680 2017 Jun 01 04:04:07.494
25162 GLOBALSTAR M001 [-] 2.974 2.414E-03 0.035 0.135 6.306
03557 COSMOS 252 DEB [-] 3.211 2017 May 31 18:29:05.118 2017 May 31 18:29:05.911 2017 May 31 18:29:06.703
10967 SEASAT 1 [-] 2.763 2.363E-03 0.097 0.185 14.190
26126 CZ-4B DEB [-] 2.817 2017 May 31 16:37:38.350 2017 May 31 16:37:38.702 2017 May 31 16:37:39.054
42733 SNUSAT-1 [+] 4.892 1.799E-03 0.012 0.049 0.005
42735 AOXIANG-1 [+] 4.892 2017 Jun 02 10:21:24.876 2017 Jun 02 10:35:22.764 2017 Jun 02 10:49:23.883
25260 SPOT 4 [-] 2.182 1.483E-03 0.053 0.184 9.197
37327 COSMOS 2251 DEB [-] 23.577 2017 May 31 02:35:29.507 2017 May 31 02:35:30.050 2017 May 31 02:35:30.594
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)
42725 LILACSAT-1 [+] 2.643 1.462E-03 0.013 0.055 0.005
42731 I-INSPIRE II [+] 2.514 2017 May 31 01:18:04.858 2017 May 31 01:31:43.245 2017 May 31 01:45:11.092
42725 LILACSAT-1 [+] 5.602 1.357E-03 0.013 0.057 0.005
42733 SNUSAT-1 [+] 5.473 2017 Jun 03 00:18:30.765 2017 Jun 03 00:32:25.747 2017 Jun 03 00:46:13.782
27386 ENVISAT [-] 4.818 1.111E-03 0.179 0.333 14.253
29198 METEOR 2-5 DEB [-] 5.248 2017 Jun 02 17:17:09.220 2017 Jun 02 17:17:09.570 2017 Jun 02 17:17:09.920
25260 SPOT 4 [-] 5.386 1.011E-03 0.101 0.143 15.070
40242 PEGASUS DEB [-] 9.226 2017 Jun 03 07:28:42.406 2017 Jun 03 07:28:42.738 2017 Jun 03 07:28:43.070
08419 COSMOS 778 [?] 1.491 1.004E-03 0.053 0.078 14.650
35526 SCOUT G-1 DEB [-] 17.309 2017 May 30 06:19:51.115 2017 May 30 06:19:51.456 2017 May 30 06:19:51.797

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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Format last updated: 2014 May 16
Current system time: 2017 May 29 15:27:54 UTC