SOCRATES

Search Results


Search parameters:

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


Data current as of 2019 May 21 16:06 UTC

Computation Interval: Start = 2019 May 21 12:00:00.000, Stop = 2019 May 28 12:00:00.000
Computation Threshold: 5.0 km
Considering: 4,618 Primaries, 17,399 Secondaries (27,362 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)
44110 PROGRESS-MS 11 [+] 1.970 1.000E+00 0.000 0.000 0.000
44222 DRAGON CRS-17 [+] 1.970 2019 May 21 12:00:00.000 2019 May 21 12:00:00.000 2019 May 28 12:00:00.000
44069 SOYUZ-MS 12 [+] 1.970 1.000E+00 0.000 0.000 0.000
44222 DRAGON CRS-17 [+] 1.970 2019 May 21 12:00:00.000 2019 May 21 12:00:00.000 2019 May 28 12:00:00.000
44188 CYGNUS NG-11 [+] 1.970 1.000E+00 0.000 0.000 0.000
44222 DRAGON CRS-17 [+] 1.970 2019 May 21 12:00:00.000 2019 May 21 12:00:00.000 2019 May 28 12:00:00.000
43702 PROGRESS-MS 10 [+] 1.970 1.000E+00 0.000 0.000 0.000
44222 DRAGON CRS-17 [+] 1.970 2019 May 21 12:00:00.000 2019 May 21 12:00:00.000 2019 May 28 12:00:00.000
43756 SOYUZ-MS 11 [+] 1.970 1.000E+00 0.000 0.000 0.000
44222 DRAGON CRS-17 [+] 1.970 2019 May 21 12:00:00.000 2019 May 21 12:00:00.000 2019 May 28 12:00:00.000
25394 RESURS O1-N4 [?] 5.816 7.812E-02 0.006 0.023 5.830
42112 COSMOS 1275 DEB [-] 5.043 2019 May 26 07:20:25.484 2019 May 26 07:20:26.342 2019 May 26 07:20:27.200
24841 IRIDIUM 16 [-] 5.688 1.404E-02 0.012 0.051 3.729
37413 FENGYUN 1C DEB [-] 7.288 2019 May 26 22:44:11.205 2019 May 26 22:44:12.546 2019 May 26 22:44:13.886
43560 LEMUR-2-YUASA [+] 4.672 6.623E-04 0.030 0.052 14.719
29837 FENGYUN 1C DEB [-] 4.700 2019 May 25 05:35:21.561 2019 May 25 05:35:21.901 2019 May 25 05:35:22.240
41556 ZIYUAN 3-2 (ZY 3-2) [+] 4.041 4.018E-04 0.043 0.061 15.201
43167 LEMUR-2-TALLHAMN-ATC [+] 4.273 2019 May 25 13:18:45.832 2019 May 25 13:18:46.161 2019 May 25 13:18:46.490
26536 NOAA 16 [-] 3.593 6.485E-03 0.017 0.070 1.058
41059 NOAA 16 DEB [-] 4.294 2019 May 25 03:21:15.148 2019 May 25 03:21:19.873 2019 May 25 03:21:24.598

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: 2019 May 21 17:40:25 UTC
Accessed 1 times since 2000 December 16
Current system time: 2019 May 21 23:20:03 UTC