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 Aug 17 16:05 UTC

Computation Interval: Start = 2018 Aug 17 12:00:00.000, Stop = 2018 Aug 24 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,280 Primaries, 17,057 Secondaries (24,743 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)
43560 LEMUR G [+] 1.077 1.426E-01 0.001 0.005 0.000
43561 LEMUR H [+] 1.404 2018 Aug 17 12:00:00.000 2018 Aug 18 05:00:16.916 2018 Aug 21 13:37:58.997
24278 JAS-2 (FO-29) [P] 5.227 1.791E-02 0.003 0.010 7.938
22352 SL-16 DEB [-] 5.238 2018 Aug 22 03:57:34.885 2018 Aug 22 03:57:35.515 2018 Aug 22 03:57:36.145
28521 COSMOS 2414 [+] 4.512 9.430E-04 0.028 0.040 14.777
14458 DELTA 1 DEB [-] 5.325 2018 Aug 22 00:36:21.819 2018 Aug 22 00:36:22.157 2018 Aug 22 00:36:22.496
41967 FLOCK 3P-1 [+] 4.643 2.484E-03 0.010 0.042 0.023
41990 FLOCK 3P-33 [+] 4.906 2018 Aug 21 19:27:15.950 2018 Aug 21 19:30:54.957 2018 Aug 21 19:34:33.968
37673 SAC-D [-] 4.914 8.305E-04 0.029 0.042 15.024
18512 SL-8 DEB [-] 4.610 2018 Aug 21 22:41:37.724 2018 Aug 21 22:41:38.057 2018 Aug 21 22:41:38.390
42804 IRIDIUM 123 [+] 1.353 6.300E-04 0.034 0.049 14.889
40561 DMSP 5D-2 F13 DEB [-] 1.946 2018 Aug 18 13:37:24.802 2018 Aug 18 13:37:25.138 2018 Aug 18 13:37:25.474
41857 YUNHAI 1 [+] 1.438 5.358E-04 0.037 0.053 14.856
34641 COSMOS 2251 DEB [-] 1.916 2018 Aug 18 20:27:04.433 2018 Aug 18 20:27:04.769 2018 Aug 18 20:27:05.106
27609 TRAILBLAZER 2 [-] 1.690 1.080E-03 0.035 0.064 14.477
14820 SL-14 R/B [-] 1.518 2018 Aug 18 20:08:14.657 2018 Aug 18 20:08:15.002 2018 Aug 18 20:08:15.348
43042 AEROCUBE 7B [+] 3.879 1.009E-03 0.016 0.066 0.001
43043 AEROCUBE 7C [+] 3.944 2018 Aug 17 12:00:00.000 2018 Aug 21 00:52:58.466 2018 Aug 24 06:06:51.844
02920 OPS 7202 (DMSP 4A F3) [-] 4.546 5.991E-04 0.023 0.079 9.590
37028 FENGYUN 1C DEB [-] 5.415 2018 Aug 22 00:04:18.684 2018 Aug 22 00:04:19.205 2018 Aug 22 00:04:19.727

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 Aug 17 17:28:06 UTC
Accessed 1 times since 2000 December 16
Current system time: 2018 Aug 18 00:29:20 UTC