American whaler Pacific departed to sea in 1818

Of Nantucket, master Benjamin Whipper, departed on 29 August 1818 towards the Pacific Ocean and returned on 8 October 1820 with 1.764 barrels sperm and 543 barrels whale.

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