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CelesTrak

Search parameters:

  • Name(s): Top 10 by NORAD Catalog Number
  • Order by NORAD Catalog Number
  • Return first 10 items


Data current as of 2024 Mar 29 00:05:34 UTC

Computation Interval: Start = 2024 Mar 29 00:00:00 UTC, Stop = 2024 Apr 05 00:00:00 UTC
Computation Threshold: 5.0 km
Considering: 9,548 Primaries, 26,009 Secondaries (71,050 Conjunctions)
26 SGP4 Propagation Errors
Computation run time: 04h 57m 21.696s

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 900 CALSPHERE 1 [+] 7.415 2024-04-04 20:35:40.637 4.935 9.724
50 km All 424 ALOUETTE 1 (S-27) [?] 7.690 1.911E-07 1.487
GP Data 900 CALSPHERE 1 [+] 6.427 2024-04-03 20:53:02.486 1.630 14.482
50 km All 9695 THORAD DELTA 1 DEB [-] 6.291 2.521E-07 1.005
GP Data 900 CALSPHERE 1 [+] 1.084 2024-03-29 12:38:33.217 2.733 7.933
50 km All 17526 SL-8 R/B [-] 0.817 1.748E-06 0.748
GP Data 900 CALSPHERE 1 [+] 4.348 2024-04-01 18:59:02.539 3.505 14.622
50 km All 22533 THORAD AGENA D DEB [-] 3.947 4.949E-08 2.381
GP Data 900 CALSPHERE 1 [+] 7.193 2024-04-04 15:15:36.943 2.042 2.712
50 km All 28208 NIMBUS 2 DEB [-] 7.729 4.139E-07 0.489
GP Data 900 CALSPHERE 1 [+] 5.050 2024-04-02 11:49:46.963 0.819 10.911
50 km All 38135 FENGYUN 1C DEB [-] 8.074 1.858E-06 0.271
GP Data 902 CALSPHERE 2 [+] 5.457 2024-04-02 19:30:43.394 3.567 12.890
50 km All 1425 THOR ABLESTAR DEB [-] 5.271 7.717E-08 1.500
GP Data 902 CALSPHERE 2 [+] 5.418 2024-04-02 18:34:36.365 1.963 13.554
50 km All 12735 COSMOS 1275 DEB [-] 5.500 2.178E-07 0.966
GP Data 902 CALSPHERE 2 [+] 4.719 2024-04-02 01:47:42.314 3.890 11.343
50 km All 17638 COSMOS 1275 DEB [-] 4.532 7.900E-08 1.344
GP Data 902 CALSPHERE 2 [+] 1.531 2024-03-29 21:17:49.495 4.651 10.772
50 km All 40113 CZ-4C DEB [-] 0.985 5.854E-08 1.517

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.