How accurate is centering a star by eye.
I actually do it automatically in MaximDL. I switch the main camera over to guide mode, let the guider program pick whatever star it wants in the image and let it autoguide. At the end of 3 - 5 minutes I press the Enter button on the keypad and let the program advance to the next calibration point. I don't do the centering manually, i let MaximDL do that. When I have gathered enough points I switch the camera back over to imaging and take my exposures.
I can see where Atrack can adjust the guide rates after each image, however that means that there is drift in the image that is being measured. I'm not 100% convinced that plate solve can determine the position to an accuracy level of sub-arc seconds, so i did not pursue this method. Besides, if you're going to use fancy software for this, then I would simply use APCC Pro and make an all-sky model, and be done with it. My program is for portable setups where the user has a mount, scope and keypad, maybe a laptop and maybe just a digital camera. No fancy software, just the basics to have some imaging fun.
From: Donald Rudny <mkea13800@...>
Sent: Sat, May 30, 2020 12:12 am
Subject: Re: [ap-gto] Mach2 Unguided testing continues
I haven’t used Atrack, but have been reviewing the manual and I believe the program continuously adjusts the drift rate as you capture images. They are saved in a file that is watched by the program and plate solved through Pinpoint. I believe there is also a modeling routine that I assume can be saved as long as the setup remains the same. As I say, I’m not 100% sure of this, but it looks like it’s worth taking a look at.
One question I have on the AP keypad system is accuracy. How accurate is centering a star by eye. I would think that a longer time between inputs would be necessary to improve accuracy. If I have a fairly decent PA, I would think I might need a 10-15 minute drift measurement. A longer focal length would also help.
On May 29, 2020, at 6:15 PM, uncarollo2 <chris1011@...> via groups.io <chris1011@...> wrote: