SOCRATES Plus

Search Results

CelesTrak

Search parameters:

  • Name(s): Top 10 by Time of Closest Approach
  • Order by Time of Closest Approach
  • Return first 10 items


Data current as of 2024 Jul 17 00:05:36 UTC

Computation Interval: Start = 2024 Jul 17 00:00:00 UTC, Stop = 2024 Jul 24 00:00:00 UTC
Computation Threshold: 5.0 km
Considering: 10,061 Primaries, 26,280 Secondaries (68,839 Conjunctions)
14 SGP4 Propagation Errors
Computation run time: 05h 02m 18.506s

SOCRATES Format Documentation

See notes at bottom of page for data field descriptions

Data
&
Graphs
NORAD
Catalog
Number
Name [Ops Status] Days
Since
Epoch
TCA
(UTC)
Min
Range
(km)
Relative
Speed
(km/sec)
Max
Probability
Dilution
Threshold
(km)
GP Data 48948 HAWK-3C [+] 0.574 2024-07-17 00:00:04.567 4.187 9.962
50 km All 51030 SICH-2-30 (SICH-2-1) [+] 0.179 1.982E-07 1.254
GP Data 52371 STARLINK-3798 [+] 0.228 2024-07-17 00:00:14.416 4.357 13.478
50 km All 14866 SL-8 DEB [-] 0.642 1.147E-06 1.874
GP Data 45024 YINHE-1 [+] 0.415 2024-07-17 00:00:24.657 0.677 15.030
50 km All 48726 NOAA 17 DEB [-] 2.929 3.273E-06 0.470
GP Data 49410 STARLINK-3147 [+] 1.005 2024-07-17 00:00:28.743 3.453 13.949
50 km All 58726 OBJECT Q [-] 0.423 1.669E-06 1.625
GP Data 46147 STARLINK-1611 [+] 0.399 2024-07-17 00:00:30.848 3.025 7.744
50 km All 52935 DS-EO [+] 0.955 3.807E-06 0.813
GP Data 56358 STARLINK-5482 [+] 0.182 2024-07-17 00:00:34.413 1.942 10.948
50 km All 30233 FENGYUN 1C DEB [-] 0.185 2.589E-05 0.626
GP Data 36036 SMOS [+] 0.472 2024-07-17 00:00:38.614 3.666 12.842
50 km All 29074 DMSP 5D-2 F11 DEB [-] 4.075 1.919E-07 1.479
GP Data 29505 SHIJIAN-6 02A (SJ-6 02A) [+] 0.440 2024-07-17 00:00:41.944 3.229 10.741
50 km All 54873 STARLINK-5091 [+] 0.713 2.834E-06 1.023
GP Data 53225 STARLINK-4358 [+] 0.146 2024-07-17 00:00:44.351 4.699 9.986
50 km All 22357 SL-16 DEB [-] 0.594 1.410E-06 1.413
GP Data 47761 STARLINK-2179 [+] 0.727 2024-07-17 00:00:55.023 2.933 13.510
50 km All 33770 COSMOS 2251 DEB [-] 0.543 2.509E-06 1.273

10 records found

Data Fields:
  • Data: The GP Data button links to a page which provides the GP data used to generate the associated prediction.
  • NORAD Catalog Number: NORAD Catalog Numbers of the two conjuncting objects.
  • Name: SATCAT 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 GP or SupGP (green) element set used to produce the prediction until the time of closest approach for the conjunction.
  • TCA (UTC): Time of closest approach.
  • Min Range (km): The distance between the two conjuncting objects at the time of closest approach.
  • Relative Speed (km/sec): Relative speed of the two conjuncting objects at the time of closest approach.
  • 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. For more details on the maximum probability method, see Dr. Sal Alfano's paper titled "Relating Position Uncertainty to Maximum Conjunction Probability".
  • 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.
  • SGP4 Propagation Errors: A list of objects which were not screened because their GP data shows they have already decayed (but haven't yet been reflected in the SATCAT) or will decay prior to the end of the computation interval.