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The paper High Frequency Peakers: Young radio sources or flaring blazars? by S.Tinti et.al. lists some nice radio-wavelength SEDs, like these for instance:

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When looking for more photometric info on a source, I'd normally go to NED. When I try one of these objects (like 0005+0254) in the search box, the database can't find it. Is there some place where I could find alternative names for the objects in this paper? Or another source for photometric measurements of these objects?

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The problem is that names like "0005+0254" are hopelessly vague; you probably wouldn't get anything useful from Simbad, either, if you just typed that into the search field. They might be valid as part of a longer name, but you need to know the proper format of that longer name, which isn't at all obvious.

Looking more closely at the paper, there is this line in Section 2.2: "Accurate positions of the target sources were obtained from the JVAS catalogue ...". So maybe something with "JVAS" in the name?

If you click on one of the links in the "SIMBAD objects" table that @astrosnapper linked to, you'll get a Simbad page for that object. Down near the bottom will be a link to NED info; clicking on that shows that the objects really is in NED. In the long-ish list of bewildering alternate names, there is in fact one that starts with "JVAS"... (More precisely, it has the form "JVAS Jnnnn+nnnn" or "JVAS Jnnnn-nnnn", where the nnnn$\pm$nnnn part matches the names in the paper you're reading.)

So you can find these sources in NED directly, but you have to name them as, e.g., "JVAS J0005+0254" instead of just "0005+0254".

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The best source for alternative names for astronomical objects is the SIMBAD database and many journals, such as A&A, include links to SIMBAD for the objects in a paper automatically. If you go to the "homepage" for the paper at the publisher, you should see a link for 'SIMBAD objects' in the side bar (direct link). This will bring up a table of the objects and some basic data. Clicking on an object will get you all the identifies, measurements and references for the object as well as links to query catalogs for the object in Vizier and at NED.

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