The scientists decided to hold back on releasing photographs of Iceberg until they were able to study him further, "but we have been looking for him ever since," said Hoyt.
Orcas can travel thousands of miles.
The scientists would like to establish whether Iceberg is albino -- a genetic condition that leaves animals unable to produce melanin, a dark pigment of skin, hair and the eye's retina and iris.
Many albino animals never grow into adulthood. Their visibility is a disadvantage in the hunt for food and protection against predators.
Two other white orcas are known to live in the waters where Iceberg was spotted, east of Kamtchatka peninsula in Russia's far-east, but they are juveniles.
In 1970, a two-year-old white orca, Chimo, was captured in Canada for a dolphinarium, and was diagnosed with a type of albinism after its death two years later.
"We want to find out a lot more about Iceberg," said Hoyt. "We would like to find out how he is able to survive as a white whale.
The FEROP team will set out for Bering Island next week as art of a project to study the social behaviour and communication of the Kamchatkan orca population, which they say is under threat from overfishing and plans to expand oil and gas exploration.