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CelesTrak

Search parameters:

  • Name(s): Top 10 by NORAD Catalog Number
  • Order by NORAD Catalog Number
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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 900 CALSPHERE 1 [+] 4.698 2024-07-21 07:16:45.976 3.447 11.145
50 km All 4614 THORAD AGENA D DEB [-] 4.444 1.031E-07 1.161
GP Data 900 CALSPHERE 1 [+] 3.288 2024-07-19 21:25:41.097 4.990 14.612
50 km All 8646 SL-8 R/B [-] 3.266 2.135E-07 3.355
GP Data 900 CALSPHERE 1 [+] 3.361 2024-07-19 23:10:30.510 4.614 14.612
50 km All 8646 SL-8 R/B [-] 3.339 2.499E-07 3.101
GP Data 900 CALSPHERE 1 [+] 7.304 2024-07-23 21:48:47.748 3.040 14.640
50 km All 10440 COSMOS 839 DEB [-] 7.732 7.379E-08 1.841
GP Data 900 CALSPHERE 1 [+] 3.976 2024-07-20 13:56:15.465 2.583 14.279
50 km All 13462 COSMOS 1275 DEB [-] 4.045 1.065E-07 1.500
GP Data 900 CALSPHERE 1 [+] 0.757 2024-07-17 08:40:23.888 4.163 14.705
50 km All 24305 UNAMSAT-2 (MO-30) [-] 0.798 4.905E-09 2.899
GP Data 900 CALSPHERE 1 [+] 6.588 2024-07-23 04:37:31.495 4.657 14.517
50 km All 27639 SL-14 DEB [-] 7.255 2.985E-08 2.970
GP Data 900 CALSPHERE 1 [+] 5.643 2024-07-22 05:57:29.794 4.183 14.046
50 km All 30305 FENGYUN 1C DEB [-] 5.699 4.410E-08 2.239
GP Data 900 CALSPHERE 1 [+] 3.632 2024-07-20 05:40:44.672 4.869 1.254
50 km All 31387 FENGYUN 1C DEB [-] 4.185 7.359E-08 1.153
GP Data 900 CALSPHERE 1 [+] 4.120 2024-07-20 17:23:28.387 4.889 11.509
50 km All 36990 FENGYUN 1C DEB [-] 5.147 4.964E-08 1.701

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.