Hallo,
These days I try to get some photos of the comet ZTF C/2022 E3. Soon it starts to move faster relative the stars and there is a need to change the motor speed in the mount. How much the comet's or astroid's speed (dRA, dDEC) are you can get from NASA or CdC (Skychart) but the information is in wrong format.
I did a complement to my calculater of angles with a relative speed calculator. From degrees/hour to arcsec/sec:
http://www.astrofriend.eu/astronomy/...nversions.html
I haven't got a clear sky after I finished this calculator and haven't a chance to test it so maybe something wrong, but looks to do the right calculation. Let me know if you have a clear sky somewhere and can test on a comet.
/Lars