Scope Mount
Posted January 2, 2009
By admin
Can someone Help me with celestial coordinates and my scope mount?
would i be able to use the RA and Dec. numbers on my telescope mount to find a object with out actually looking at the sky(if i adjusted everything first) using celestial coordinates in a atlas.
if i do need to adjust something, please help me with that to. or should i just star hop, which seems annoying since i have a mirror scope.
Yes, but there are a few factors to consider. First of all, your polar alignment has to be good. Usually for visual use my polar alignment consists pointing the tripod in the right direction with a compass and then levelling it with a spirit level. For using arbitrary co-ordinates you need to be much more exacting. With my lowest power eyepiece on my manual scope I get a FOV of just under three degrees, and it is dodgy at the edges. That means the polar alignment has to be within a degree to get objects in view even with that eyepiece.
Secondly, on most manual scopes the RA scale is fixed to the axis - if you have a motor drive attached the RA scale advances even when tracking which means that even if set correctly initially it drifts from the correct value as the session progresses. I set mine to be correct at local midnight which makes it easy to calculate the amount to add or subtract from the RA co-ordinate for the current time.
You can make your task a lot easier if you navigate to a nearby naked eye object some other way and then navigate towards the object numerically. I have homemade clickers fitted to the slow motion controls of my manual scope that click once per rotation. Since I know that one click equals 1.4 degrees on both axes of my scope I can count the clicks from the nearby object to the one I am interested in. I find this works very well and is less dependent on precise polar alignment.
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