SOCRATES

Search Results


Search parameters:

  • NORAD Catalog Number(s): 25544
  • Order by Maximum Probability
  • Return first 25 items


Data current as of 2020 Apr 08 00:07 UTC

Computation Interval: Start = 2020 Apr 08 00:00:00.000, Stop = 2020 Apr 15 00:00:00.000
Computation Threshold: 5.0 km
Considering: 5,351 Primaries, 18,514 Secondaries (31,009 Conjunctions)

See notes at bottom of page for data field descriptions

Re-sort results by Minimum Range, 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)
25544 ISS (ZARYA) [+] 6.548 4.775E-05 0.701 1.885 12.547
31280 FENGYUN 1C DEB [-] 7.284 2020 Apr 14 09:45:06.026 2020 Apr 14 09:45:06.395 2020 Apr 14 09:45:06.764
25544 ISS (ZARYA) [+] 5.549 2.843E-05 0.836 2.656 10.788
43507 CZ-2D DEB [-] 5.803 2020 Apr 13 09:45:50.343 2020 Apr 13 09:45:50.736 2020 Apr 13 09:45:51.128
25544 ISS (ZARYA) [+] 6.035 2.108E-05 0.879 3.407 6.594
43047 LEMUR-2-BRIANDAVIE [+] 6.636 2020 Apr 13 21:25:56.028 2020 Apr 13 21:25:56.583 2020 Apr 13 21:25:57.138
25544 ISS (ZARYA) [+] 2.894 1.032E-05 1.278 4.787 7.633
29837 FENGYUN 1C DEB [-] 2.966 2020 Apr 10 18:02:37.051 2020 Apr 10 18:02:37.240 2020 Apr 10 18:02:37.429
25544 ISS (ZARYA) [+] 3.367 6.114E-06 2.205 4.682 14.073
29126 SL-14 DEB [-] 3.680 2020 Apr 11 05:23:46.788 2020 Apr 11 05:23:46.913 2020 Apr 11 05:23:47.038
25544 ISS (ZARYA) [+] 3.470 5.650E-06 2.518 4.437 14.825
40378 FIREBIRD 4 [+] 3.520 2020 Apr 11 07:51:32.613 2020 Apr 11 07:51:32.768 2020 Apr 11 07:51:32.924

6 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: 2020 Apr 08 01:57:54 UTC
Accessed 1 times since 2000 December 16
Current system time: 2020 Apr 08 07:30:34 UTC