Using my scopes setting circles
Posted 27 August 2009 - 06:13 AM
I have purchased myself a HEQ5 mount and a WO MEGREZ 72 for Deep Sky AstroPhotography.
But am struggling to find objects. I have been following a tutorial I found on the internet which said Polar align your scope (Which I have by drift alignment), then find a star your know the coordinates of, centre in scope and set the setting circles to match it coordinates.
I have done the above and have no problem with Declination but when slewing the scope to Right Ascension the scope is pointing in a direction that is obviously not correct. I then have to manually swing back and forth in RA in the approx area I think the object is until I find it. Since I have such a small aperture on my scope it is not always possible with fainter objects.
Can anyone tell me what I am doing wrong or is there some issue with my mount.
Thanks for any help
Posted 27 August 2009 - 09:35 AM
Assuming you are in the northern hemisphere the scale should read higher as you slew the scope to the east.
Several things to check;
is your object correctly identified?
Where are you getting your coordinates from? a book, or a programme?
if it's a programme is it set for the correct date/time/position?
do you use daylight saving time?
any of those will throw you off to start with.
good luck, let us know how you get on.
Posted 29 August 2009 - 10:29 AM
Had another go last night and I think I cracked the problem. It seems that the scale I need to use on the RA of my HEQ5 is the bottom not top. I know this is supposed to be for the southern hemisphere, but it seems to work for me. I also noticed that in my planetarium programme (Stellarium) I had not set it to use an equatorial mount. The combination of the two and I can now put an object with in my 25mm EP.