... I've deleted all but a few relevant entries regarding exposure start/midpoint ... This is confusing. The start time is twice given as 8:46:47, once as...
... Possibly, the two start points (8:36:14 and 8:46:47) refer to the start points of the first and last individual frame, and 8:39:36 is the middle or avarage...
Thanks for the help in figuring this out. I'm still trying to figure this out and have a post up on the ACP forums to see if any of them know. I was just...
It seems every time I try to do data reduction, I am asked to manually align the stars, but there doesn't seem to be any possible way that the stars could line...
... Make sure that the settings for the CCD and telescope confoguration (pixel size, focal length, orientation) specified in the program settings are correct. ...
... I looked at possibilities like that, but there is a total of 900s (15m) of exposures, but 8:39 is only 3m later than 8:36. Nothing seemed to fit. -John ...
Well, I got an answer from Bob Denny, author of ACP.. Mack -- When stacking an image, ACP calculates for the image start time the START of the "center" image....
If I tell astrometrica that the UT time is midpoint and measure the ACP stacked images I get 8:46:47UT for object and then stack them in astrometrica and leave...
... (pixel ... are correct. ... As best I can tell, I am set up right, but I am always prompted for manual alignment. If I click 'Present possibly erroneous...
... You use too small max. residuals for the astrometry. Set this parameter higher (--> settings), Astrometrica will then reject less stars and match more of...
... Astrometrica calculates the mid-point for stacked images from the average of the mid-points of all individual franes. You can easily verify this, by...
I've found this thread interesting. I regularly do stacking, and have never had any problems with the results. Herbert's explanation of how the times are...
... There must be something else going on, as I had to increase the maximum astrometric error to 4.0'' before it would work. The resulting data reduction has...
... Clearly too much. ... Are you using a linear fit? This should work most of the time but I *have* seen telescope optics where it didn't, so you could try...
Dear Herbert, dear list, yesterday I came back to Astrometrica :-) ...after using PinPoint for quite some time (as I am using ACP and MaxIm for my imaging)....
UCAC2 has certain constraints on its content. In particular, if two stars are close together, neither may be included in the filed. I haven't plotted the field...
Tim, if you want you can send me one or two of your images with your configurations file, and I will give it a try. But please note that (i) my mailbox size is...
... Omega Centauri from Hamburg? ;^) ... Very difficult, to say the least. Almost impossible for Astrometrica, to be honest. Just remember how the reference...
I just viewed Omega centauri in 'The Guide' plotted against the UCAC2 stars. There are quite a few UCAC2 stars but at 7' or further away from the centre. One...
... The 'alignment area' is only used to align the individual images with each other. The reference star match always uses the "n" brightest stars in the while...
Some really interesting Q's in the last few days.... Two questions.... 1. On the stacking issue, I've been thinking further about this (a dangerous thing...!)...
I digged into NEAT images and found first time an object I was looking for :-) Now, can somebody help with the necessary parameters to report those data? Like...
Hello, It´s interesting to find Asteroids on NEAT Images. I one time found too one, but the measurements have been to bad an I worked out on Histogrammimages...
JsfKoeb@...
Aug 3, 2005 3:50 pm
2745
... looking ... report ... Please visit : http://www.astrosurf.org/juan_lacruz/Docs/SkyMorph.htm I hope you find it useful. Juan...
Dear Herbert, David and Dave, I appreciated all your comments about my attempt to solve my Omega Cen images with UCAC2. BTW: I know that a lot is possible from...
Dieter, ... But no prove at all. The calculated focal length and pixel scales must match the real ones. Only that will show if the fit is valid. Even fits with...
... Yes it is. As you pointed out, the positions could reference to any time during the exposure. Indeed, in previous versions, the time and position referred...
Okay, The 10th planet not the cult planet. But last Tuesday early a.m. I found myself unable to sleep. So I downloaded the latest MPC ephemeris into TheSky,...
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