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3 votes

Milky Way position on the sky

Following @Petoetje59's idea of using the data in the "mw.json" file I was able to add a fine Milky Way contour rendition to my proper motions planisphere project. I just took all the ...
Oscar Ferro's user avatar
1 vote

Why would some sources in a cross-matched DESI/SDSS catalog have different spectroscopic redshifts?

Catalogs have mistakes in them. Misidentified objects, misidentified lines, foreground or background contamination of spectra, ... This is difficult work, impossible to do perfectly.
John Doty's user avatar
  • 2,547

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