:Category:Astronomical objects by year of discovery
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Subcategories named "Astronomical objects discovered in YYYYMMDD if all are known. Otherwise, use YYYYMM?? for unknown day, and ? for unknown month and day. Astronomical objects discovered by (before 1500) should be sorted similarly, but omitting the century. For instance, the supernova of 1054 AD would be sorted as 540704 as it was discovered on July 4, (10)54. Use [https://en.wikipedia.org/w/index.php?title=Special:Search&limit=500&offset=0&ns0=1&ns10=1&ns100=1&search=insource%3A%2F%28Astronomical+objects%7CGalaxies%29+discovered+in+%5B0-9%5D%7B4%7D%5C%5D%5C%5D%2F&searchToken=5g8fvv471cvk6n4ri9iefc1jv this search] to find all pages in these subcategories that are still missing a sortkey.
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