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How-to's Accessories Reviews

Astrophotography – The Tracking Telescope Mount

David Goldstein (dagoldst)


Keywords: astrophotography, equipment, telescope, mount, dagoldst

In my earlier introduction article, I briefly outlined the baseline equipment required for doing Deep Sky Object, (DSO), imaging.   In the next few articles, I am going to cover specific technologies in more detail with the idea that there are challenges and benefits to mastering each one of these tightly integrated components of hardware and software that make it possible for a motivated person to image distant galaxies, nebulas, and other spectacular DSO.  It took me considerable time to gain all the knowledge and skills and it is hard to condense even a single topic in one overarching document, so again this segment is more of a primer and will cover the basics of a tracking telescope mount.

The mount is the bedrock of your imaging sessions.  I tend to encourage anyone interested to make a significant investment in this one critical component.  In my case, I was thinking more of the budget and all the items I needed.  I was definitely underestimating the mounts role. But, before I could go cheap, my wife knew I was looking at the Orion Atlas as my top end spend, (I was considering the lesser Orion Sirius), so she bought one for Christmas 6 years ago as a surprise.  It sat in its box for a year before I got going while I did more research as I still had no idea what I was doing.  It has turned out to be more than adequate, even though I installed some modifications. More on that later in the article.

For now, a few key definitions to help with following this section:

It would be nice if you could see the CNP from your polar scope view, but you cannot.  However, Polaris which is a few degrees from CNP and orbits around it from a telescope perspective.  Therefore, in polar alignment, you are actually aligning your mount using the offset position of CNP from Polaris.  The examples below visualize this situation.

Celestial North Pole and Polaris relationship as seen in the free program Stellarium:

Polaris and Celestial North Pole
Click for an enlargement

 

If you have loaded Stellarium, (and you should have by now) and have zoomed to this level, you can actually accelerate the rotation in the program and observer Polaris revolve around the CNP.

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1 comment

Russell Whittemore (rosewood_ltd) on June 7, 2019

Donor Ribbon awarded for his support to the Fundraising Campaign 2014 Donor Ribbon awarded for his generous support to the Fundraising Campaign 2015 Ribbon awarded for his generous support to the Fundraising Campaign 2017 Awarded for his in-depth knowledge and high level of skill in several areas. Ribbon awarded as a member who has gone beyond technical knowledge to show mastery of the art a

A very nice overview, David. For anyone interested in AP, this is a good description of what it takes to get your feet wet. it gives the newbie a clear idea of the basic equipment needs and nice, straightforward explanation of some of the fundamental concepts that need to be mastered to begin the journey. Please keep the articles coming. I am saving these helpful pieces for my own future reference.

G