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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 Dec 11 16:05:31 UTC

Computation Interval: Start = 2023 Dec 11 16:00:00 UTC, Stop = 2023 Dec 18 16:00:00 UTC
Computation Threshold: 5.0 km
Considering: 9,022 Primaries, 25,867 Secondaries (70,085 Conjunctions)
7 SGP4 Propagation Errors
Computation run time: 04h 48m 35.924s

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 42826 NORSAT 1 [+] 4.338 2023-12-14 20:29:25.799 0.021 14.916
50 km All 55414 STARLINK-5620 [+] 3.648 3.193E-02 0.013
GP Data 52873 STARLINK-4211 [+] 7.614 2023-12-18 06:02:28.456 0.025 10.791
50 km All 55326 HAWK-6C [+] 7.383 4.487E-02 0.008
GP Data 45425 ONEWEB-0067 [+] 6.628 2023-12-17 06:27:45.815 0.027 14.355
50 km All 24279 H-2 R/B [-] 6.561 3.840E-02 0.018
GP Data 47376 STARLINK-2096 [+] 1.709 2023-12-12 09:11:08.259 0.029 11.783
50 km All 57186 CSTP 1.2 (STC 1.2) [+] 0.920 3.153E-02 0.010
GP Data 43772 RANGE-A [+] 1.861 2023-12-12 12:15:37.031 0.031 6.980
50 km All 55336 STARLINK-5655 [+] 1.129 3.624E-02 0.008
GP Data 46913 R2 [+] 3.242 2023-12-14 03:02:21.599 0.033 2.497
50 km All 48597 STARLINK-2255 [+] 3.246 3.383E-02 0.008
GP Data 51131 STARLINK-3388 [+] 5.574 2023-12-16 01:28:24.403 0.033 7.588
50 km All 57182 MONITOR-4 (RS57S) [+] 4.594 3.015E-02 0.009
GP Data 44949 STARLINK-1122 [+] 3.628 2023-12-15 01:39:09.512 0.036 13.625
50 km All 35341 PSLV DEB [-] 5.522 1.617E-02 0.016
GP Data 49387 SDGSAT 1 [+] 3.121 2023-12-14 13:21:50.466 0.043 14.958
50 km All 47953 OBJECT X [-] 3.113 8.848E-04 0.027
GP Data 41854 PROMETHEUS 2-1 [+] 7.592 2023-12-18 13:44:12.663 0.044 14.992
50 km All 42404 NOAA 16 DEB [-] 13.875 8.281E-04 0.028
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 47968 MYRIOTA 7 (TYVAK-0152) [+] 6.599 2023-12-17 13:32:39.071 0.045 7.088
50 km All 43891 OBJECT R [-] 6.128 1.973E-03 0.012
GP Data 46679 STARLINK-1773 [+] 1.920 2023-12-13 02:49:34.242 0.047 9.313
50 km All 10208 DELTA 1 DEB [-] 2.563 1.423E-02 0.014
GP Data 58331 OBJECT CD [+] 5.728 2023-12-17 03:16:25.798 0.049 13.436
50 km All 14699 COSMOS 1536 [?] 6.078 1.030E-03 0.021
GP Data 41026 YAOGAN-28 [+] 5.123 2023-12-16 13:37:03.967 0.056 13.919
50 km All 53763 YAOGAN-35 05C [+] 5.145 7.124E-04 0.026
GP Data 43570 IRIDIUM 166 [+] 1.554 2023-12-12 20:36:04.403 0.067 14.086
50 km All 30015 FENGYUN 1C DEB [-] 1.759 4.491E-04 0.034
GP Data 57646 STARLINK-30265 [+] 7.323 2023-12-18 00:31:23.384 0.069 13.424
50 km All 58464 OBJECT C [+] 6.554 5.126E-04 0.029
GP Data 53057 STARLINK-4252 [+] 1.682 2023-12-12 17:50:18.773 0.071 15.246
50 km All 39929 PEGASUS DEB [-] 15.934 2.619E-03 0.050
GP Data 47629 STARLINK-1974 [+] 5.952 2023-12-17 08:36:19.925 0.072 10.068
50 km All 14817 SL-8 DEB [-] 6.420 5.942E-03 0.022
GP Data 57427 OBJECT D [+] 4.635 2023-12-16 01:44:35.277 0.078 15.123
50 km All 41024 TIANHUI 1-03 DEB [-] 5.551 2.586E-04 0.051
GP Data 32289 YAOGAN 3 [+] 3.791 2023-12-15 06:29:09.209 0.080 15.100
50 km All 17192 SL-14 R/B [-] 4.310 5.412E-04 0.057
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 58278 FLOCK 4Q-19 [+] 6.424 2023-12-17 07:55:17.084 0.080 0.005
50 km All 58279 FLOCK 4Q-8 [+] 6.424 6.931E-04 0.019
GP Data 48694 STARLINK-2748 [+] 6.818 2023-12-17 14:25:24.877 0.087 11.542
50 km All 57195 AVION KALUGA 650 [+] 6.170 3.660E-03 0.029
GP Data 48978 ONEWEB-0260 [+] 7.693 2023-12-18 10:47:33.793 0.087 11.260
50 km All 33658 FENGYUN 1C DEB [-] 12.050 1.279E-03 0.030
GP Data 53718 STARLINK-4695 [+] 4.934 2023-12-16 03:04:09.156 0.089 5.568
50 km All 33600 FENGYUN 1C DEB [-] 26.780 4.681E-03 0.022
GP Data 57712 STARLINK-30348 [+] 3.109 2023-12-14 01:21:03.135 0.089 12.291
50 km All 25979 ARIANE 40 R/B [-] 3.100 4.669E-03 0.033

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.