The "Image of the Month" for May 2005 is now online at the Astrometrica web site, <http://www.astrometrica.at>. Click on the thumbnail image on the menu bar at...
... "...at the 0.6m reflector. The camera is operated at the prime focus of the f/2.4 telescope, but a focal reducer is used to bring the foal ratio to f/1.2."...
Hi there Just done some tests with mid time point in stacking, and come up with some interesting results. Suppose I have 6 consecutive images of 1 asteroid...
... You do not *need* to stack consecutive images, but I would certainly recommend it. Of course, you may reject some images in a sequence, fopr example, if...
... While I haven't checked the details, I've thought about this a few times and I believe the full story is that you need the "time centroid" of the...
... John, for "normal" image stacks, you are absolutely right. There is a little bit more calculation behind the scenes with the track and stack feature of...
The skies cleared here in South Florida and I had an enjoyable night with the asteroids and alligators. I managed to observe a bunch of asteroids but I had...
Ladislav, I use the Known Object Overlay for finding the object as you do, but since Astrometrica does not calculate perturbations, the position is sometimes...
Thanks for your helpful comments. Yes, I kind of know most of it but some of it can be eliminated as a source of error. With 2005 Jxx asteroids the mpcorb...
Second reply. Since you reminded me of the possibility that the asteroid may be some distance from the 'overlay' box, I re-analyzed my images for 2005 JR5. I...
... As was mentioned earlier on the list, Astrometrica will calculate unperturbed ephemeris. The known object overlay is for identification purposes only...
Thanks, Herbert. I ALWAYS download the newest mpcorb.dat - I use it also for one of my programs. It is interesting that some asteroids are reported by ...
... Note that the elements in the MPCOrb (even for NEOs) always refer to the standrad epoch, which might differ by +/-100 days from the current date. Only if...
That's an important info. Somehow, I have not been aware of this fact - it's probably well documented by you somewhere. Nobody's perfect. Best, LN ... From:...
... observed ... field - I ... failed. The ... Observations of 1988 NE are indeed very desirable. Unfortunately, this is a 1-opp Amor and the current 3-sigma ...
Very useful info. If I understand you correctly, there not much chance for an amateur astronomer to 'recover' 1988 NE since the uncertainties are so large. To...
... Don't worry, LINEAR turns the star-light off with a mouse click ;-) If anyone wants to write an astrometry software to "beat" Astrometrica, then star...
... What does it say? E.g. "Only x out of y reference stars were matched". I get this too sometimes. Increasing the allowed astrometric residual limit in the...
Also, you must to review the telescope focal, and the camera angle orientation in the Astrométrica settings, and sometimes if you discard the first image,...
Jim When you say that you can 'solve' each individual image, do you get an 'automatic' solution or do you have to do manual match as well? As I understand the...
What I sometimes do in such situation is to accept, in a first instance, a probably wrong match which in turn results, some times, in a good match. If you're...
First let me introduce myself as I only joined today. My name is Tony Angel and I am located at 36 52 30 North, 3 15 0 West, Height 1372 metres. I think I have...
The first problem is very likely caused by an error in the 'environments' settings - the catalog(s) could not be found. Or you do not HAVE the selected...
... Assuming you were using the USNO-B reference star catalogue via the Internet (as originally specified in the confiogurations file that comes with the...
Hi, I turned the firewall off. Yes I was trying to attempt to use the USNO- B via the internet. I am starting to suspect, after re-reading the help files that...
... While acessing the MPCOrb database trought ftp requires that the ISP supports reverse DNS lookup and that the users sends a valid e-mail address as...
Hi, Partially solved, though I am not sure how, I can now access the USNO-B data. Still cannot access the MPCOrb database through tp so an email is going off...
Hello, I'm trying to stack images of a comet that is displaying a large coma region. The stacking routine seems to be getting confused when aligning the images...
Do the images have a common centre, or has the field shifted between exposures? I suspect the stacking works best when the fields are the same. If your fields...
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