2021-07-03, 08:28 PM
(This post was last modified: 2021-07-03, 09:27 PM by bigmasterdrago.)
Yep. It was ripping along. And even much faster as the phase angle changed quickly and the magnitude also caved. So my window was very small to attempt when possibly at the edge of my scope and skies. I tend to almost always use Horizons as a cross check but cannot print finder charts from there. ST4 makes awesome charts. It had only 2 days of observations so was a last minute opportunity for a fast mover.
As you know the elements change rapidly as we encounter an especially close small rock from space. That's why we need those up to the moment element sets. To know where the gravitational perturbations of the Earth/Moon system have redirected its path. I think with this really close rock being so small, it would have behooved me to get elements and positions by the minute! Crazy stuff. This small rock really got thumped when it passed over and outside our planet. I stuck a small video of the impact on the orbit of 2021 NA at https://vimeo.com/manage/videos/570736817. At its closest point to my backyard, it was moving 2152.98"/m (~0.59°/min)! At that moment, ~5° up in the NW and ~18th magnitude due partly to a low phase angle (15%). But really close (64415Km).
You probably know how to get those Osculating Elements. I'll refresh for others. Fill in the form at https://ssd.jpl.nasa.gov/horizons.cgi Make sure that Elements Type is set to Elements. Fill in your other info. You can also get positions by choosing Observer Table for Elements Type. This will give you everything you need to edit the Osculating Elements within ST.
(2021-07-03, 04:13 PM)PMSchu Wrote: Hi BMG,
I noticed in your thread where you posted the osculating elements that you were getting different values for the elements for every hour. Am I interpreting that correctly? The values seemed to change in the 3rd or 4th decimal place for several elements. Wow! It's a wonder you can find anything at all under those conditions.
Phil S.
As you know the elements change rapidly as we encounter an especially close small rock from space. That's why we need those up to the moment element sets. To know where the gravitational perturbations of the Earth/Moon system have redirected its path. I think with this really close rock being so small, it would have behooved me to get elements and positions by the minute! Crazy stuff. This small rock really got thumped when it passed over and outside our planet. I stuck a small video of the impact on the orbit of 2021 NA at https://vimeo.com/manage/videos/570736817. At its closest point to my backyard, it was moving 2152.98"/m (~0.59°/min)! At that moment, ~5° up in the NW and ~18th magnitude due partly to a low phase angle (15%). But really close (64415Km).
You probably know how to get those Osculating Elements. I'll refresh for others. Fill in the form at https://ssd.jpl.nasa.gov/horizons.cgi Make sure that Elements Type is set to Elements. Fill in your other info. You can also get positions by choosing Observer Table for Elements Type. This will give you everything you need to edit the Osculating Elements within ST.