![]() When I tried Elbrus Star Locator, I could not convince it to solve my images. Both appear to require approximate information about image scale and rotation. And I found the Elbrus Star Locator, which is open source. ![]() Searching for more general tools, I found the PinPoint Astrometric engine which is a commercial product. Most of the astrometric tools I found on the web are only for "refining" already known star positions. This information can ultimately be used to label a star image, as I do in my application.Īs far as I know, this capability is quite unique. The result of the solver is center position, rotation, scale of the solved image, plus some more obscure information about the WCS coordinate system. It can do so without knowing scale or rotations, because asterisms are invariant to these factors. Using the asterisms as fingerprints, it reduces possible positions/scales/rotations in the sky to a few candidates that can be validated using the other stars in the image. When given an astronomical image, the Blind Solver identifies bright stars, and queries the database for the asterisms of those stars. In essence, the Blind Solver works by creating a large database containing relative positions of groups of 4 stars (asterisms). Dustin Lang's thesis is an extended version of that. If you are interested in how this software works, an article published by the project is probably the best introduction. ![]() The Blind Solver is a product of a university project (of which I was not part), documented on. In this article, I want to introduce you to the software that I use behind the scenes of the PI script (and that I did not write, I just use it in my script). Let's get you started with the Blind Solver.
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