American whaler Equator departed to sea in 1818

Of Nantucket, master Elisha Folger, departed on 31 October 1818 towards the Pacific Ocean and arrived on 1 December 1820 with 709 barrels sperm and 611 barrels whale,

Source
Catalogue of Nantucket Whalers and their voyages from 1815 to 1870. Hussey&Robinson, Nantucket, 1876.