NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2013 Sep 21, 05:53 -0700
Greg,
You stated:
"I avoid using wide angle lenses for CN purposes because of excessive distortion and higher minutes of arc per pixel values. Telephoto lenses are better for CN but have a limited field of view."
The LADEE photos were taken with a 15mm lens for a wide field view. My hope is that the distortion is well enough defined that it can be accurately compensated for. A photograph with a normal (i.e. not a fisheye) lens is effectively a gnomonic projection with great circles on the sky mapping to straight lines on the image. Textbook on Spherical Astronomy by W. M. Smart, my standard go-to reference for all things spherical trigonometric, has an entire chapter on this subject immediately preceeding the one on the "Determination of Position at Sea". It's available at google books http://books.google.com/books?id=W0f2vc2EePUC
Regards,
Robin Stuart
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