Pointing Model Window

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Pointing Model Window

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The pointing model window shows some of the physical properties for the Astro-Physics dual model. The properties are explained here.

To open a model select the menu File->Open and navigate to the APPM model that you want to load.

NOTE: This screen shot is slightly out of date. We have blurred out the extraneous data that is no longer displayed on this screen.



The pointing model window is broken up into several sections. The bottom section shows the pointing errors for the East and West models as a pair of scatter diagrams. In the upper left of the graph is the overall average pointing error for the model (in arc-seconds - RMS). This is the average expected pointing error of the model using the Root Mean Square. The maximum expected error is shown at the bottom.

Note that obtaining the average error stated assumes that the mount is ReCalibrated into the model and that the effects of refraction are properly being accounted for.

In the upper left section is the Model Properties Group Box.  These are are the most important model terms. You can check/uncheck them to see how well the model fits the data by looking at how the average and maximum errors (and graph points) change. Usually you will want all terms selected.

NOTE: in the terms the Index Dec Error, Non-perp (Dec,OTA), and Flex Cantilever Axis usually have inverted signs between the axes. Also, the quality of the Polar alignment numbers can be judged by how well they match in each of the dual models. If they are close you can be confident that the numbers are modeled well (the Azimuth is most important).

The last large section in the upper right, the table, simple shows the raw data points collected for the model. You can uncheck specific data points if they seem to be bad data points.