Timeline for Why can n2yo somehow interpret this TLE but Skyfield can't? Why does it return nans and zeros for position?
Current License: CC BY-SA 4.0
4 events
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| Jan 20, 2022 at 23:22 | comment | added | uhoh | Oh I see, got it. | |
| Jan 20, 2022 at 23:21 | comment | added | Ryan C | publicly available. it's the one you can download from space-track.org documentation page. i've linked it before, let's see, first you need to register, log in, and then you can click space-track.org/documentation#/sgp4 , which is the same as clicking the "Help" dropdown menu and scrolling down to "SGP4". | |
| Jan 20, 2022 at 23:19 | comment | added | uhoh |
+1 yes the perturbed eccentricity used inside the SGP4 calculation is different from the mean eccentricity input. See the other answer. I think that "Why can perturbed eccentricity be larger than 1 when the mean isn't?" might be a good new question! Is the "Space Force SGP4 library" a publicly available thing or only for Gardians with clearance?
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| Jan 20, 2022 at 23:13 | history | answered | Ryan C | CC BY-SA 4.0 |