I am trying to image two targets with specific start and end altitudes, due to the topography of my back yard.
I would like Sequence 1 to start at 30 degrees in the east and stop at 60 degrees in the west.
Next, I would like to start Sequence 2 immediately and stop at 45 degrees in the west.
Can this be done with the DO IF ALTITUDE BETWEEN action in a DragScript?
My concern is that Sequence 1 would only run from 30 degrees to 60 degrees altitude on the east side of the meridian instead of crossing the meridian and stopping at 60 degrees on the west side, as I intend.
Other threads have discussed similar things, but I am not aware of a resolution. Has anyone else figured out how to address this situation?
DO IF ALTITUDE check for a single value greater or lower
DO ID ALTITUDE BETWEEN check if altitude are in a interval
No one of this block check the side of meridan.
If you know transit you can put DO IF TIME block and inside a DO IF ALTITUDE BETWEEN
This solve your problem.
If you serach for DO IF HOURANGLE blocks that are not yet developed in Voyager.
Hi Leo,
A couple of months ago I requested a similar request. Maybe the best way to do this is use the DO if altitude between and have a checkbox to indicate both for the start and end altitude which side of the pier. For example:
Do if altitude between 30 East and 60 West, or
Do if altitude between 60 West and 30 West, or
Do if altitude between 30 East and 60 East
For my observing program I want the range to be something like:
Do if altitude between 45 East and 45 West
This would provide a declination arc starting in the east and finishing in the west which would include a pier flip.
Leo,
Another thought. The problem with DO IF ALTITUDE BETWEEN is not knowing which side of the pier the altitude value is. But, if we add this instead DO IF HOURANGLE BETWEEN then it would work because hour angle can be positive or negative depending on the side of the pier. It may be easier to implement HOURANGLE than ALTITUDE. No need to have boxes for East and West for hour angle.
For example:
DO IF ALTITUDE BETWEEN 30 EAST and 60 WEST, or
DO IF HOURANGLE BETWEEN -3 and +2
Craig it’s Hour angle or more precisely plus and minus hours from the meridian. I can mess around with altitude but every target is different. Setting a minimum altitude together with hour angle covers all my requirements from home.
I am really glad this change is being considered as I also like to have a general way to start and stop a loop of images based on altitude above horizon in the East or West.
I find the way this is done in CCDCOmmander could be applied here. In that program there is an option to do this by object. So in the configuration box you could search for say M15 and it would fill in the RA and DEC automatically. That would be especially helpful.
For the problem with East or West. There is a radio button where you can select “Object Rising East” or “Object Setting West”.
Having those two options would make this script command easier to use without writing two loops as one could select a block to start as an object is rising the East and then jump out when the object sets int the West.
It’s the same where I am due the LP dome means I can’t image very low in any direction. Together with the RA angle I can now specify the whole of my imageable sky area at home.
