# Should you include aberration effects during low Earth orbit observations?

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?

• 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. Commented Nov 16, 2023 at 21:54
• @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. Commented Dec 5, 2023 at 11:13
• 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. Commented Dec 6, 2023 at 17:33