You could keep going out to the Milky Way then the local group...
Antares radius of 473.08* million k's according to wiki, that's a circumference of nearly 3 billion k's. Neptune sits around 2.88 billion k's from the sun... the world rocks in around 40,075k at the equator...
(*Though the range of the diameter may vary by .947 to 1.114 billion k's....)
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