Understanding dx & dy

[john_robertson1953]

Hi Robin,

I’m trying to understand the purpose/meaning of alignment status offset dx & dy.

What do these amounts represent? What’s my objective here? How do I adjust the values? What’s considered good value/not good values? Is this graphically represented in drift graph?

In my particular case, the numbers seem to build wildly, sometimes increasing, and other times they could decrease after increasing.

Any insight/direction you can provide me will be greatly appreciated.

Thank you,

John

[admin]

Hi,

if you are talking about live stacking then the values are the movement in the image since the first frame in the stack (measured in pixels). dx is in the x direction and dy in the y direction. There is no real aim for these, they just show how far the telescope image has drifted - if they get too big then you will start to see dark borders at the edge of the stack. They should generally change gradually from frame to frame.

cheers,

Robin