Calculate time for jupiter to move across FOV

[Chefgage]

Sorry about the title, i could not think how to word it better.

Let me just set the scene. I am photgraphing jupiter by taking a video of it on my canon 200d. I am using the camera and telescope in the prime focus method.  My telescope is a skywatcher 200p which has a focal length of 1200mm.  Jupiter takes 1.5 minutes to cross the cameras sensor (1.5 minutes across the live view screen).

Now the question is if i use an eyepiece with the camera and telescope in the eyepiece projection method how does this affect the time it takes jupiter to move across the field of view.

If my maths is correct then if i use an 8mm eyepiece with an apparent FOV of 68 degrees then this will have a true FOV of 0.45 degrees with my telescope focal length of 1200mm. So jupiter should move across the FOV in 1.8 minutes. I got the 1.8 minutes from the stars and planets moving across the sky due to earth rotation in 0.25 degrees per minute. So 0.45/0.25 = 1.8

So by adding the camera does this affect the 1.8 minutes due to the sensor size of the camera.  Does that make sense 😀

[rickwayne]

Something wrong there but I can't tease it out -- an object will move faster across the sensor when it's nearer the celestial equator. If you think about it, a star near Polaris might stay on the sensor all night.

There are FOV calculators online (e.g. astronomy.tools FOV calculator for eyepieces and CCD calculators) but I'm not sure how to set up for eyepiece projection.

[Chefgage]

20 hours ago, rickwayne said:

Something wrong there but I can't tease it out -- an object will move faster across the sensor when it's nearer the celestial equator. If you think about it, a star near Polaris might stay on the sensor all night.

There are FOV calculators online (e.g. astronomy.tools FOV calculator for eyepieces and CCD calculators) but I'm not sure how to set up for eyepiece projection.

Thanks for that. I agree something does not seen right in my explantion. In the end i thought just by a suitble eyepiece and try it. Well the eyepiece has been delivered today so i can now make the comparison.

Edited July 3, 2019 by Chefgage