2021-09-03, 09:17 PM
I downloaded the elements for 2021 QY3 because it wasn't on the list yesterday. A download of the single MP from the MPC got me the elements for epoch 2021 Jul 5, so I downloaded the NEAs at Today's Epoch again to get elements for Sept 3. Unfortunately 2021 QY3 will be too faint to observe. You never know what you'll get from the MPC, it seems.
I don't know how accurate an interpolation of positions between two element epochs would be. You seemed to get pretty large differences between ST4 & HORIZONS when the elements didn't correspond, which they won't during a close approach - they're changing constantly. ST4 isn't designed to handle this use case, but it's SO GOOD at making charts.
Oh well, get used to disappointment I suppose.
Phil S.
I don't know how accurate an interpolation of positions between two element epochs would be. You seemed to get pretty large differences between ST4 & HORIZONS when the elements didn't correspond, which they won't during a close approach - they're changing constantly. ST4 isn't designed to handle this use case, but it's SO GOOD at making charts.
Oh well, get used to disappointment I suppose.
Phil S.