I am working on calibration of some observations of low Earth orbit satellites and I am wondering should I include aberration effects? My logic is that diurnal aberration would have neglegible magnitude for such low orbit (I have at best 2-3 arcsecs of precision) and annual aberration does not have any effect, because satellites are rotating around a Sun together with Earth. Is my logic correct or magnitudes of aberration effects are bigger than I think?

  • $\begingroup$ Low Earth satellite speeds are about 8 km/s. The Earth’s 35 km/s motion results in 20 arcsec aberration. So, you should worry. $\endgroup$
    – eshaya
    Commented Nov 16, 2023 at 21:54
  • $\begingroup$ @eshaya 35km/s refers to Earth speed around the Sun, right? From Sun POV satellites that are orbiting Earth are orbiting Sun with close to the same speed. $\endgroup$
    – jlipinski
    Commented Dec 5, 2023 at 11:13
  • $\begingroup$ Yes, the 35km/s refers to Earth’s motion around he Sun. I brought it up for you to use to scale for other relative velocities in your project and decide their magnitudes. $\endgroup$
    – eshaya
    Commented Dec 6, 2023 at 17:33


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