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CelesTrak

Search parameters:

  • Name(s): Top 25 by Minimum Range
  • Order by Minimum Range
  • Return first 25 items


Data current as of 2023 Jun 08 08:05:31 UTC

Computation Interval: Start = 2023 Jun 08 08:00:00 UTC, Stop = 2023 Jun 15 08:00:00 UTC
Computation Threshold: 5.0 km
Considering: 7,833 Primaries, 24,936 Secondaries (52,043 Conjunctions)
8 SGP4 Propagation Errors
Computation run time: 04h 21m 00.381s

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 43795 ORBWEAVER 1 [+] 2.548 2023-06-10 11:05:23.493 0.011 14.573
50 km All 52343 STARLINK-3849 [+] 2.390 1.393E-01 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.627 2023-06-15 05:38:04.388 0.027 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.627 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.693 2023-06-15 07:13:04.890 0.027 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.693 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.495 2023-06-15 02:28:03.013 0.028 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.495 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.561 2023-06-15 04:03:03.762 0.028 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.561 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.429 2023-06-15 00:53:02.126 0.029 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.429 5.846E-03 0.006
GP Data 31698 TERRASAR-X [+] 0.899 2023-06-08 14:57:18.479 0.031 0.000
50 km All 36605 TANDEM-X [+] 2.018 4.427E-03 0.007
GP Data 44207 TIANHUI 2-01A [+] 8.363 2023-06-14 23:18:01.116 0.031 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.363 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.297 2023-06-14 21:42:59.956 0.032 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.297 5.846E-03 0.006
GP Data 31698 TERRASAR-X [+] 0.831 2023-06-08 13:20:16.330 0.034 0.000
50 km All 36605 TANDEM-X [+] 1.951 4.427E-03 0.007
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 44207 TIANHUI 2-01A [+] 8.231 2023-06-14 20:07:58.686 0.034 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.231 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.165 2023-06-14 18:32:57.240 0.036 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.165 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 8.099 2023-06-14 16:57:55.665 0.038 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.099 5.846E-03 0.006
GP Data 48928 PAINANI-2 [+] 6.882 2023-06-14 12:06:21.884 0.039 13.567
50 km All 55242 SHIYAN 22A (SY-22A) [+] 6.400 1.545E-03 0.017
GP Data 43530 PRSS 1 [+] 1.527 2023-06-09 15:55:58.587 0.040 10.821
50 km All 21891 DELTA 2 R/B(1) [-] 1.927 9.633E-03 0.013
GP Data 44207 TIANHUI 2-01A [+] 8.033 2023-06-14 15:22:53.945 0.041 0.000
50 km All 44209 TIANHUI 2-01B [+] 8.033 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 7.967 2023-06-14 13:47:52.078 0.043 0.000
50 km All 44209 TIANHUI 2-01B [+] 7.967 5.846E-03 0.006
GP Data 52549 STARLINK-3935 [+] 5.381 2023-06-13 04:51:34.980 0.045 11.518
50 km All 31327 FENGYUN 1C DEB [-] 5.305 1.377E-02 0.015
GP Data 44207 TIANHUI 2-01A [+] 7.901 2023-06-14 12:12:50.043 0.046 0.000
50 km All 44209 TIANHUI 2-01B [+] 7.901 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 7.835 2023-06-14 10:37:47.844 0.048 0.000
50 km All 44209 TIANHUI 2-01B [+] 7.835 5.846E-03 0.006
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 31698 TERRASAR-X [+] 0.763 2023-06-08 11:42:03.360 0.050 0.000
50 km All 36605 TANDEM-X [+] 1.883 4.427E-03 0.007
GP Data 31698 TERRASAR-X [+] 0.965 2023-06-08 16:33:19.674 0.051 0.000
50 km All 36605 TANDEM-X [+] 2.085 4.427E-03 0.007
GP Data 44207 TIANHUI 2-01A [+] 7.769 2023-06-14 09:02:45.496 0.051 0.000
50 km All 44209 TIANHUI 2-01B [+] 7.769 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 7.703 2023-06-14 07:27:42.972 0.053 0.000
50 km All 44209 TIANHUI 2-01B [+] 7.703 5.846E-03 0.006
GP Data 44207 TIANHUI 2-01A [+] 7.637 2023-06-14 05:52:40.319 0.056 0.000
50 km All 44209 TIANHUI 2-01B [+] 7.637 5.846E-03 0.006

25 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.