According to the schedule posted by Mineo JE9PEL earlier, FO-29 will be fired up on the 02:31Z pass over Japan. It will remain in the light as it comes down the Atlantic. So that means around 03:00Z, FO-29 will come in range of the far east US and should still be on. It will be a pretty low pass but it will be well in range of Europe so contacts with DX stations will be posible (DX stations can participate in Field Day by giving their station class and section "DX" although they can't submit their entries.) When the bird gets down to about the latitude of New York City, it will enter the eclipse and turn off shortly after, as the batteries are not in good shape.

73, Sam KC2LRC