astrometry plugin

[Beth Snoke Harris]

I am learning how to analyze astronomy images with ImageJ.  I've  
downloaded the Astronomy plugins and can access them but can't figure  
out the Astrometry plugin.  I select it and get a message to "Select  
2 stars of known position to be measured".  Then I click OK and a  
Measurements window opens.  Next I click on 2 stars but nothing happens.

Can anyone let me know what I am doing wrong?
Thank you!
Beth

Beth Snoke Harris
Science Educator
Pisgah Astronomical Research Institute
One PARI Drive
Rosman, NC  28772
828.877.6348
[hidden email]
www.pari.edu

[Frederic V. Hessman]

You should have seen ROI's displayed on the image overlay, values  
entered in your "Measurements" window, and a dialogue asking you for  
the celestial coordinates of your two objects (from which the scale  
and image rotation can be calculated).

If you don't see your measurements, you probably haven't set your  
aperture parameters correctly (e.g. radii of the object and sky  
apertures) or "Assume background is a plane" is selected (see  "Set  
Aperture") but you haven't installed the Jama matrix library needed  
to fit the background around the stars.

Sorry - I should have warned potential down-loaders that the  
"astrometry" plugin is just a crude test tool.

Rick

On 3 Apr 2007, at 5:18 pm, Beth Snoke Harris wrote:

> I am learning how to analyze astronomy images with ImageJ.  I've  
> downloaded the Astronomy plugins and can access them but can't  
> figure out the Astrometry plugin.  I select it and get a message to  
> "Select 2 stars of known position to be measured".  Then I click OK  
> and a Measurements window opens.  Next I click on 2 stars but  
> nothing happens.
>
> Can anyone let me know what I am doing wrong?
> Thank you!
> Beth
>
> Beth Snoke Harris
> Science Educator
> Pisgah Astronomical Research Institute
> One PARI Drive
> Rosman, NC  28772
> 828.877.6348
> [hidden email]
> www.pari.edu

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Dr. Frederic V. Hessman     [hidden email]
Institut für Astrophysik          Tel.  [phone]
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37077 Goettingen                 Room F04-133
http://www.Astro.physik.Uni-Goettingen.de/~hessman
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