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CelesTrak

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  • Name(s): Top 25 by Minimum Range
  • Order by Minimum Range
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Data current as of 2025 Feb 18 00:05:33 UTC

Computation Interval: Start = 2025 Feb 18 00:00:00 UTC, Stop = 2025 Feb 25 00:00:00 UTC
Computation Threshold: 5.0 km
Considering: 11,014 Primaries, 27,126 Secondaries (81,332 Conjunctions)
27 SGP4 Propagation Errors
Computation run time: 06h 36m 12.557s

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 42831 FLYING LAPTOP [+] 1.342 2025-02-19 03:15:16.529 0.008 15.026
50 km All 55662 STARLINK-5479 [+] 1.695 1.000E+00 0.000
GP Data 56204 GHGSAT-C6 [+] 4.489 2025-02-22 06:13:45.220 0.014 14.787
50 km All 62023 STARLINK-32334 [+] 4.640 2.622E-01 0.007
GP Data 48388 STARLINK-2594 [+] 1.034 2025-02-18 21:11:04.926 0.015 14.541
50 km All 43822 OBJECT BS [-] 1.256 2.444E-01 0.007
GP Data 49069 LEDSAT [+] 0.966 2025-02-18 17:16:28.579 0.016 13.810
50 km All 59355 STARLINK-31416 [+] 1.727 2.266E-01 0.007
GP Data 46267 TYVAK-0172 [+] 7.343 2025-02-24 22:16:23.980 0.032 8.961
50 km All 56957 ION SCV-011 [+] 7.546 3.668E-03 0.009
GP Data 60391 QIANFAN-13 [+] 2.110 2025-02-19 22:27:21.102 0.033 14.524
50 km All 27491 SL-16 DEB [-] 2.393 1.397E-03 0.023
GP Data 54798 STARLINK-5420 [+] 5.808 2025-02-23 17:03:05.559 0.048 7.761
50 km All 60642 CZ-6A DEB [-] 6.199 4.731E-02 0.013
GP Data 57181 OBJECT R [+] 3.595 2025-02-21 09:02:00.072 0.049 3.366
50 km All 60571 OBJECT DH [+] 4.193 1.758E-03 0.012
GP Data 46456 JILIN-1 GAOFEN 3D [+] 6.584 2025-02-24 09:21:51.565 0.050 13.930
50 km All 59848 STARLINK-31859 [+] 7.010 2.749E-02 0.023
GP Data 37168 SBSS (USA 216) [+] 2.424 2025-02-20 00:59:27.320 0.051 13.420
50 km All 660 THOR ABLESTAR DEB [-] 2.467 9.346E-04 0.022
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 54174 STARLINK-5248 [+] 3.586 2025-02-21 10:16:15.743 0.058 4.923
50 km All 24529 PEGASUS DEB [-] 3.832 3.614E-02 0.015
GP Data 62746 STARLINK-32780 [+] 1.886 2025-02-19 11:15:25.942 0.058 8.907
50 km All 46292 3CAT-5A [-] 2.348 3.169E-02 0.017
GP Data 55104 SHARJAHSAT-1 [+] 3.129 2025-02-20 21:57:57.655 0.061 9.356
50 km All 57675 STARLINK-30317 [+] 3.318 2.788E-02 0.018
GP Data 53215 STARLINK-4335 [+] 0.577 2025-02-18 07:59:24.508 0.069 14.666
50 km All 30898 FENGYUN 1C DEB [-] 0.994 1.143E-02 0.040
GP Data 57029 OBJECT AB [+] 6.892 2025-02-24 10:39:52.641 0.070 12.782
50 km All 61718 STARLINK-32591 [+] 6.639 1.638E-02 0.027
GP Data 58468 SPIRIT [+] 2.155 2025-02-19 22:28:40.049 0.072 14.752
50 km All 58893 STARLINK-31255 [+] 2.058 1.050E-02 0.041
GP Data 55611 STARLINK-5730 [+] 4.093 2025-02-21 10:35:53.306 0.073 14.202
50 km All 57574 CZ-6A DEB [-] 3.877 1.163E-02 0.037
GP Data 59785 STARLINK-31890 [+] 5.578 2025-02-23 01:00:45.023 0.076 7.529
50 km All 31612 FENGYUN 1C DEB [-] 6.897 1.986E-02 0.020
GP Data 57633 STARLINK-30306 [+] 1.879 2025-02-19 12:02:34.327 0.083 11.370
50 km All 29110 DELTA 2 DEB [-] 1.880 1.356E-02 0.028
GP Data 48690 STARLINK-2740 [+] 4.304 2025-02-22 02:58:12.379 0.084 10.295
50 km All 48837 FALCON 9 DEB [-] 4.616 1.442E-02 0.026
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 58369 STARLINK-30870 [+] 5.616 2025-02-22 23:39:57.007 0.087 14.353
50 km All 33728 FENGYUN 1C DEB [-] 5.515 8.011E-03 0.045
GP Data 60026 STARLINK-31939 [+] 5.076 2025-02-22 12:33:43.376 0.091 10.550
50 km All 57429 OBJECT F [-] 4.678 1.199E-02 0.028
GP Data 61767 NOKHCHO [+] 3.438 2025-02-21 05:14:29.942 0.094 14.791
50 km All 38248 RISAT-1 [-] 3.639 2.006E-04 0.055
GP Data 46505 NETSAT-3 [+] 7.225 2025-02-24 16:50:08.833 0.098 14.582
50 km All 48407 STARLINK-2595 [P] 6.855 5.946E-03 0.054
GP Data 38755 SPOT 6 [+] 5.720 2025-02-23 12:33:02.904 0.099 9.711
50 km All 40086 ORBCOMM FM109 [+] 5.984 3.601E-04 0.029

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.