Hi all, I work with Astrometrica 4.3.3.352. When sometimes Astrometrica did not match with USNO-B1 charts it helped to change the values: Ref. stars...
JsfKoeb@...
Jul 2, 2006 7:03 pm
3091
I imaged 2004 XP14 during its closest approach to earth (2006 07 03 0820 to 2006 07 03 1125 UTC) and did astrometry with Astrometrica. The asteroid was so...
Ladislav, What did you use for the motion? In these cases, with rapidly changing speeds, Astrometrica might not compute the correct speed. If you did not...
Bert, Astrometrica retrieves the speed from MPCORB.DAT (the same database is used by MPC's MPES) and puts it in. Since this is done only for the FIRST image ...
Bert, Thanks for the suggestion. IT WORKED! I retrieved from MPES the speed and angle for the first image - it was somewhat different from the value used by ...
... Astrometrica calculates two positions for the asteroid, one at the instant of the first image, and the second one some time (I think ten minutes, but I...
Herbert, Thanks for confirmation of my 'suspicions'. I think the issue is really the unperturbed vs. perturbed calculations. This, I think, is confirmed by...
You might want to look at Bill Gray's numerical integration DOS program that updates the whole MPCORB.dat file to todays epoch. Instructions on how it works...
Elliott, Robert C.
elliottb@...
Jul 10, 2006 8:01 pm
3099
I will do it right away. Is it possible, however, to change the orbital elements to take into account perturbations? I wrote a little snippet of code to...
I am executing integrat.exe right now. On my 1.6 GHz Pentium it should take about 10 minutes. And the orbital elements will be somehow corrected for the...
No, updating MPCORB.DAT had no effect on the 'failure' of Astrometrica to properly stack the asteroid image. The speed used by Astrometrica was 391.4"/min,...
Fascinating results. Using the 'integrated' version of MPCORB.DAT one gets much better match of the coordinates expected by Astrometrica and the measured...
... ??? I thought the motion and P.A. for the asteroid to be stacked on is calculated from the mean time of the image series, i.e. the time shown in the window...
... Reiner is right again. Obviously, he knows the software better than I do. I did check the code now - the position refers to the the "mean time" of all...
... Topocentric. ... I know that you are not using a 'old' mpcorb.dat. But all orbits in the MPCOrb main file refer to a standard epoch, which is increased in ...
One is learning something every day. I observed the option for NEO's on the Astrometrica's internet menu but I did not know what it meant. One should, perhaps,...
I thought the F in RTFM meant 'Fine' :-) Regards Robin ... From: Astrometrica@yahoogroups.com [mailto:Astrometrica@yahoogroups.com] On Behalf Of Ladislav Nemec...
Herbert's comments (and an introductory line in the MPCOrb file) below might suggest that MPCOrb is regularly updated so that each orbit includes the latest ...
... The latest *available* observations! No problem with observations of NEOs and other unusual objects, but all others are published by MPC only every week or...
Back in the days when I did astrometry, I *always* used the motion given by MPC, either the one from MPES or the one on the NEOCP. Call it paranoia... but I...
I don't weant to prolong this discussion. I made my comments essentially to raise awareness. It is a particular issue in the area of asteroidal occultations,...
Excellent idea. LN ... From: Astrometrica@yahoogroups.com [mailto:Astrometrica@yahoogroups.com] On Behalf Of Robin Lauryssen-Mitchell Sent: Tuesday, July 11,...
I read your original message and Reiner's replies. I am well aware of astorb.dat - my private database MS Access program can actually import it. But, mostly...
... Just want to note that "Track and Tack method" (i.e., adding images and compenasating does not fail. The prblem you described has nothing to do with "Track...
... Just want to note that "Track and Tack method" (i.e., adding images and compenasating for the object's motion at the same time) does not fail. The prblem...
Thanks for the link to Rolf Apitzsch's website. Very nice results, indeed and no trouble with Track and Stack. We in the Western US were 'fortunate' to see the...
'Rolf reports'. LN ... From: Astrometrica@yahoogroups.com [mailto:Astrometrica@yahoogroups.com] On Behalf Of Ladislav Nemec Sent: Wednesday, July 12, 2006 2:03...
... The positions and vectors calculated by Astrometrica are geocentric and do not include parallax corrections based on the position of the observations on...
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