I’v been attempting to employ EXORB to perform orbital calculations lately. Before I always used FindOrb, another outstanding toolkit to carry out similar functions, however, I’v been told that EXORB prevails FindOrb in finding linkages. I once fed da known Kracht sungrazer linkage 2005 W4 = 2011 E1 to FindOrb, and consequently da outcome went outrageous even though constraints hav been set. It made me even more determined to master EXORB.
My first attempt was quite simple — to compute orbital solutions for da newly discovered comet P/2011 V1 (Boattini). My settings are as follows:
Obtaining da solution was not that easy as I’d expected. Da value in toggle D had been repeatedly tested until da program rendered me a reasonable solution, which can b seen as follows:
N da residuals:
N da error n correlation matrix:
Da solution’s quite close to d one given by MPEC K11-V13.
Then I proceeded to calculate orbits for sungrazing comets observed by LASCO. For reference I first tried to solve a comet in a single apparition. Here I take C/1996 X3 as d example.
Da toggles are set to a bit different from those used for finding orbital solutions for P/2011 V1:
A parabolic solution is assumed before da computation. Noticeably da program tends not to give me an orbital solution that “seems like” a Kracht sungrazer. Instead, it frequently rendered me a retrograde orbit, with relatively large residuals. Therefore I had to repeat da computation again n again, until a reasonable solution was found:
Da next step is to save da raw solution in STATING.DAT, which will automatically return to da toggles n toggled off U. Then I set X to 3.2 n perform da calculation again:
Now I toggle on K as well as 1, 2, 3, 4, and 6:
Now add a new apparition to C/1996 X3, turn off 1, 2, 3, 4, 6 n toggle on 5:
At last, toggle on 1 to 6:
Error n correlation matrix:
Strictly speaking, I ought to delete those observations that generate large residuals. However, I found that all observations from 1996 lead to da largest residuals. If I remove them all, da linkage solution turns to meaningless. I suspect my solution for da single apparition for C/1996 X3 wasn’t da best solution, but a solution with residuals in da proximity of its local minimum. Anyway, it’d b a successful linkage solution.
My goal’s to master da way to find out da linkage solutions for an object from arbitary num of different apparitions. Evidently before I achieve it I still got a arduous journey to get hang of EXORB.