Yes, its maximum motion is ~2'/min. BMD found one in July or August that was moving at 900"/min!
I have the full MP database from the MPC, but they only provide elements at epochs ~6 months apart. ST4 can download MP elements of the 'NEAs at Today's Epoch' which you need for close approaches.
What I've been doing is:
1) Download the full MP data from MPC every 10-14 days (doing this will slow down the calcs for the NEAs),
2) Download the NEA at Today's Epoch every 2-3 days,
3) Run the DBPS for 2 days in the future looking for MPs that come within 0.05 AU (this gives you some advance warning that something is coming - also check the CNEOS website for the upcoming close approaches) There are usually ~20 NEAs found by this search.
4) Run the ephemeris from ~5 days before to ~20 days after the present day.
5) Look for the max brightness & create an ST4 Quick Log entry with this info for this time. I note the Re in the log comments too.
6) Assign a Star Rating to each MP. I use 1 star if its too faint, only visible in daylignt, from the wrong hemisphere, etc. 3 stars if its only detectable via imaging. 4 or 5 stars if its bright enough to be visible in the telescope.
7) For 4&5 star objects, save more info about the pass in the log.
8) Download element data from HORIZONS around the time of the close approach to update the ST4 MP DB with the elements right at the approach time. (This is complicated because ST4 only seems to keep one set of elements like this. I tried to add elements at T-6, T0 & T+6 hours from close approach, but only one set was saved in the DB. It's also very time consuming to input one set of elements at a time then have ST4 perform all the pre-calcs that it does to speed up plotting of the MPs each time.)
Most of the MPs get 1 star & many were detected after close approach (hence the reason to calculate the ephemeris a few days in the past to see what we missed :-).
As Greg suggests, you want to use elements that are calculated right before the approach because they're the most accurate. Another complication is that these are osculating elements & their values change during the pass. They're never right, just close enough to find the MP. BMD has run into this problem repeatedly when he tries to observe these things. Even the elements provided by HORIZONS can change as more observations of the MP are made to refine the motion. Celestial mechanics is a complex field of study.
Hope this helps, let me know if you have any questions,
Phil S.
I have the full MP database from the MPC, but they only provide elements at epochs ~6 months apart. ST4 can download MP elements of the 'NEAs at Today's Epoch' which you need for close approaches.
What I've been doing is:
1) Download the full MP data from MPC every 10-14 days (doing this will slow down the calcs for the NEAs),
2) Download the NEA at Today's Epoch every 2-3 days,
3) Run the DBPS for 2 days in the future looking for MPs that come within 0.05 AU (this gives you some advance warning that something is coming - also check the CNEOS website for the upcoming close approaches) There are usually ~20 NEAs found by this search.
4) Run the ephemeris from ~5 days before to ~20 days after the present day.
5) Look for the max brightness & create an ST4 Quick Log entry with this info for this time. I note the Re in the log comments too.
6) Assign a Star Rating to each MP. I use 1 star if its too faint, only visible in daylignt, from the wrong hemisphere, etc. 3 stars if its only detectable via imaging. 4 or 5 stars if its bright enough to be visible in the telescope.
7) For 4&5 star objects, save more info about the pass in the log.
8) Download element data from HORIZONS around the time of the close approach to update the ST4 MP DB with the elements right at the approach time. (This is complicated because ST4 only seems to keep one set of elements like this. I tried to add elements at T-6, T0 & T+6 hours from close approach, but only one set was saved in the DB. It's also very time consuming to input one set of elements at a time then have ST4 perform all the pre-calcs that it does to speed up plotting of the MPs each time.)
Most of the MPs get 1 star & many were detected after close approach (hence the reason to calculate the ephemeris a few days in the past to see what we missed :-).
As Greg suggests, you want to use elements that are calculated right before the approach because they're the most accurate. Another complication is that these are osculating elements & their values change during the pass. They're never right, just close enough to find the MP. BMD has run into this problem repeatedly when he tries to observe these things. Even the elements provided by HORIZONS can change as more observations of the MP are made to refine the motion. Celestial mechanics is a complex field of study.
Hope this helps, let me know if you have any questions,
Phil S.