SOCRATES

Search Results


Search parameters:

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


Data current as of 2014 Sep 01 16:02 UTC

Computation Interval: Start = 2014 Sep 01 12:00:00.000, Stop = 2014 Sep 08 12:00:00.000
Computation Threshold: 5.0 km
Considering: 3,488 Primaries, 14,945 Secondaries (18,990 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)
39208 SHIYAN-7 (SY-7) [+] 2.015 3.605E-03 0.009 0.031 0.000
39357 SHIYAN-7 DEB [-] 7.263 2014 Sep 01 12:00:00.000 2014 Sep 03 06:04:53.759 2014 Sep 06 16:31:44.643
10141 COSMOS 928 [?] 5.233 1.644E-02 0.008 0.032 14.561
27534 NADEZHDA 7 [-] 5.248 2014 Sep 05 17:57:54.242 2014 Sep 05 17:57:54.585 2014 Sep 05 17:57:54.928
37841 SRMSAT [+] 1.195 5.062E-04 0.026 0.078 9.655
13022 COSMOS 1275 DEB [-] 1.790 2014 Sep 02 08:44:28.064 2014 Sep 02 08:44:28.582 2014 Sep 02 08:44:29.099
01864 OPS 1509 (TRANSIT 10) [?] 7.234 7.573E-04 0.030 0.082 8.895
13575 DELTA 1 DEB [-] 7.868 2014 Sep 08 08:12:53.963 2014 Sep 08 08:12:54.525 2014 Sep 08 08:12:55.087
24794 IRIDIUM 6 [+] 6.926 3.036E-03 0.028 0.104 12.763
31717 FENGYUN 1C DEB [-] 7.587 2014 Sep 08 09:54:38.111 2014 Sep 08 09:54:38.503 2014 Sep 08 09:54:38.895
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)
23607 UPM/LBSAT [?] 2.741 3.010E-04 0.033 0.104 10.456
36471 COSMOS 2251 DEB [-] 1.781 2014 Sep 03 07:07:17.273 2014 Sep 03 07:07:17.751 2014 Sep 03 07:07:18.229
11545 COSMOS 1137 [?] 5.322 2.412E-04 0.027 0.114 14.237
10749 DELTA 1 DEB [-] 5.306 2014 Sep 05 09:27:39.207 2014 Sep 05 09:27:39.558 2014 Sep 05 09:27:39.909
25399 SAFIR 2 [-] 1.403 1.035E-04 0.041 0.118 9.369
39874 SL-16 DEB [-] 1.420 2014 Sep 01 21:02:14.290 2014 Sep 01 21:02:14.823 2014 Sep 01 21:02:15.357
23547 ORBVIEW 1 (MICROLAB) [?] 4.020 3.133E-04 0.028 0.118 14.868
37582 CBERS 1 DEB [-] 5.361 2014 Sep 05 11:46:52.957 2014 Sep 05 11:46:53.293 2014 Sep 05 11:46:53.629
00226 TIROS 4 [-] 2.066 1.040E-03 0.062 0.130 5.691
25273 IRIDIUM 57 [+] 1.529 2014 Sep 02 22:56:57.779 2014 Sep 02 22:56:58.658 2014 Sep 02 22:56:59.536

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/TS.Kelso@centerforspace.com]
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Format last updated: 2014 May 16
Current system time: 2014 September 01 21:02:39 UTC