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Andrew's Astronomy Blog

Image annotation

24 Oct 2015, 16:06 UTC
Image annotation
(200 words excerpt, click title or image to see full post)

One of the tasks that you might want to do with an image is to identify and annotate the objects within it. With it’s ImageSolver and AnnotateImage scripts PixInsight makes this really easy. The AnnotateImage script comes with several pre-canned catalogs such as Named Stars, Messier, NGC and PGC catalogs but also gives you the ability to specify your own. What I’m going to describe here is how to generate and use your own catalog from a VizieR source.
As I’m interested in Dark Nebulae, for this example I’m going to use the Lynds Dark Nebulae catalog and the first step will be to download it from VizieR. First we have to identify the catalog so we visit the search site http://cdsarc.u-strasbg.fr/viz-bin/Cat
Entering the authors name (Lynds, in this example) returns a list of all matching catalogs. We need the second item in the list which has a catalog ID of VII/7A/ldn. Clicking on the title, Lynds’ Catalogue of Dark Nebulae (LDN) (Lynds 1962), takes us to the catalog selection page http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=VII%2F7A.
We could also search on any other identifying information or, if you’re unsure you can browse the entire collection.
We’re going to use a simple constraint query to ...

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