SOCRATES

Search Results


Search parameters:

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


Data current as of 2017 Oct 22 08:06 UTC

Computation Interval: Start = 2017 Oct 22 00:00:00.000, Stop = 2017 Oct 29 00:00:00.000
Computation Threshold: 5.0 km
Considering: 4,095 Primaries, 16,678 Secondaries (22,221 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)
25482 ORBCOMM FM28 [-] 1.771 1.443E-02 0.007 0.029 4.208
33906 COSMOS 2251 DEB [-] 1.823 2017 Oct 23 13:40:40.068 2017 Oct 23 13:40:41.256 2017 Oct 23 13:40:42.444
33496 SOHLA-1 (MAIDO-1) [-] 0.392 3.604E-03 0.009 0.030 10.483
42798 COSMOS 2519 [+] 0.458 2017 Oct 22 07:17:56.263 2017 Oct 22 07:17:56.740 2017 Oct 22 07:17:57.217
40072 SKYSAT-2 [+] 0.085 4.543E-03 0.007 0.031 3.640
39211 CZ-4C R/B [-] 0.149 2017 Oct 22 00:44:24.101 2017 Oct 22 00:44:25.474 2017 Oct 22 00:44:26.848
25280 TRACE [-] 0.569 3.737E-04 0.042 0.066 14.974
40907 XW-2D [+] 0.126 2017 Oct 22 04:24:20.982 2017 Oct 22 04:24:21.316 2017 Oct 22 04:24:21.649
16611 COSMOS 1733 [?] 5.195 4.950E-04 0.029 0.072 13.048
29064 OPS 6630 DEB [-] 30.593 2017 Oct 27 02:19:59.124 2017 Oct 27 02:19:59.507 2017 Oct 27 02:19:59.890
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)
07714 METEOR 1-21 [?] 0.836 3.024E-03 0.053 0.076 14.917
38492 FENGYUN 1C DEB [-] 1.004 2017 Oct 22 16:39:35.823 2017 Oct 22 16:39:36.159 2017 Oct 22 16:39:36.494
06275 OPS 7323 (DMSP 5B F3) [-] 1.847 3.092E-04 0.044 0.077 14.418
41823 FENGYUN 1C DEB [-] 1.855 2017 Oct 23 13:01:36.333 2017 Oct 23 13:01:36.680 2017 Oct 23 13:01:37.027
28414 SJ-6B [+] 4.935 1.770E-04 0.063 0.094 15.544
36301 ISIS 1 DEB [-] 7.605 2017 Oct 27 01:53:53.799 2017 Oct 27 01:53:54.120 2017 Oct 27 01:53:54.442
13770 COSMOS 1437 [?] 3.495 1.723E-04 0.063 0.095 15.243
28939 AKARI (ASTRO-F) [-] 3.483 2017 Oct 25 05:21:42.618 2017 Oct 25 05:21:42.946 2017 Oct 25 05:21:43.274
16763 COSMOS 1753 [?] 2.852 1.869E-04 0.037 0.107 11.109
14880 THORAD DELTA 1 DEB [-] 3.770 2017 Oct 24 19:26:16.756 2017 Oct 24 19:26:17.206 2017 Oct 24 19:26:17.656

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.

TLE Data Space Data
Current GPS
Archives EOP
Documentation Space Weather
SATCAT Columns
Boxscore Software
SOCRATES
Dr. T.S. Kelso [TS.Kelso@celestrak.com]
Follow CelesTrak on Twitter @TSKelso
Format last updated: 2014 May 16
Current system time: 2017 October 22 11:42:02 UTC