SOCRATES

Search Results


Search parameters:

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


Data current as of 2018 Dec 12 00:05 UTC

Computation Interval: Start = 2018 Dec 12 00:00:00.000, Stop = 2018 Dec 19 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,452 Primaries, 17,177 Secondaries (25,303 Conjunctions)

See notes at bottom of page for data field descriptions

Re-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)
43845 CHANG'E-4 [+] 4.234 1.000E+00 0.000 0.000 0.000
43846 CZ-3B R/B [-] 4.234 2018 Dec 12 00:00:00.000 2018 Dec 12 00:00:00.000 2018 Dec 19 00:00:00.000
25114 ORBCOMM FM11 [+] 7.826 7.769E-03 0.012 0.032 12.670
30283 FENGYUN 1C DEB [-] 7.175 2018 Dec 18 17:41:50.915 2018 Dec 18 17:41:51.309 2018 Dec 18 17:41:51.704
06679 COSMOS 568 [?] 5.072 9.068E-04 0.015 0.036 12.564
14178 COSMOS 1480 [?] 3.779 2018 Dec 15 14:33:42.631 2018 Dec 15 14:33:43.028 2018 Dec 15 14:33:43.426
41978 FLOCK 3P-57 [+] 7.327 1.338E-03 0.039 0.055 15.210
13819 SL-3 R/B [-] 7.253 2018 Dec 18 11:24:19.554 2018 Dec 18 11:24:19.882 2018 Dec 18 11:24:20.211
41901 SPARK 2 [+] 3.243 5.195E-04 0.037 0.055 14.895
20435 SL-8 DEB [-] 4.192 2018 Dec 15 00:22:27.700 2018 Dec 15 00:22:28.036 2018 Dec 15 00:22:28.371
27940 RUBIN-4 & SL-8 R/B [?] 6.518 1.447E-03 0.013 0.055 3.363
34626 COSMOS 2251 DEB [-] 6.541 2018 Dec 17 10:54:29.117 2018 Dec 17 10:54:30.603 2018 Dec 17 10:54:32.090
42044 FLOCK 3P-87 [+] 2.247 1.294E-03 0.014 0.058 0.020
42045 FLOCK 3P-29 [+] 2.247 2018 Dec 13 09:17:08.520 2018 Dec 13 09:21:20.156 2018 Dec 13 09:25:31.802
12456 METEOR 2-7 [?] 5.160 4.142E-03 0.046 0.065 14.796
30930 FENGYUN 1C DEB [-] 5.684 2018 Dec 16 09:29:29.645 2018 Dec 16 09:29:29.983 2018 Dec 16 09:29:30.321
24883 ORBVIEW 2 (SEASTAR) [-] 4.099 2.073E-02 0.022 0.076 8.500
43071 IRIDIUM 138 [+] 3.399 2018 Dec 14 21:10:52.862 2018 Dec 14 21:10:53.450 2018 Dec 14 21:10:54.038
11130 COSMOS 1053 [?] 3.149 3.755E-04 0.022 0.090 4.001
19033 DELTA 1 DEB [-] 3.238 2018 Dec 14 02:14:26.278 2018 Dec 14 02:14:27.527 2018 Dec 14 02:14:28.777

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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Last updated: 2018 Dec 12 01:32:52 UTC
Accessed 1 times since 2000 December 16
Current system time: 2018 Dec 12 01:34:24 UTC