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CelesTrak

Search parameters:

  • NORAD Catalog Number(s): 25544
  • Order by Minimum Range
  • Return first 25 items


Data current as of 2024 Apr 21 16:05:32 UTC

Computation Interval: Start = 2024 Apr 21 16:00:00 UTC, Stop = 2024 Apr 28 16:00:00 UTC
Computation Threshold: 5.0 km
Considering: 9,684 Primaries, 26,136 Secondaries (70,110 Conjunctions)
21 SGP4 Propagation Errors
Computation run time: 04h 58m 01.079s

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 25544 ISS (ZARYA) [+] 1.531 2024-04-22 21:55:19.865 2.067 6.914
50 km All 22101 ARIANE 3 DEB [-] 2.418 5.716E-05 0.534
GP Data 25544 ISS (ZARYA) [+] 0.619 2024-04-22 00:02:12.963 2.693 14.413
50 km All 53371 OBJECT B [+] 0.877 1.699E-05 1.379
GP Data 25544 ISS (ZARYA) [+] 5.484 2024-04-26 20:47:24.480 3.145 12.549
50 km All 37131 COSMOS 2251 DEB [-] 14.431 1.722E-05 1.165
GP Data 25544 ISS (ZARYA) [+] 5.738 2024-04-27 02:53:54.280 3.362 12.219
50 km All 49789 COSMOS 1408 DEB [-] 6.063 1.563E-05 1.201
GP Data 25544 ISS (ZARYA) [+] 7.134 2024-04-28 12:24:43.341 4.351 7.660
50 km All 15680 ARIANE 3 DEB [-] 7.613 1.261E-05 1.151
GP Data 25544 ISS (ZARYA) [+] 4.100 2024-04-25 11:34:32.328 4.652 6.932
50 km All 57423 CERES-1 R/B [-] 4.311 1.119E-05 1.213
GP Data 25544 ISS (ZARYA) [+] 2.620 2024-04-24 00:03:42.172 4.675 6.419
50 km All 52419 MYRADAR1 [+] 2.840 1.126E-05 1.199

7 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.