21821 Billryan - DefZone.Net

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List of minor planets: 21001–22000#821

Before turning 21821 Billryan into an article, please check whether the content will satisfy the guidelines for astronomical object notability. In particular, the object must have significant coverage from independent, reliable sources. Just because an object is listed in a database (like the JPL Small-Body Database) does not mean it is notable.

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