This is the first UFO report, chronologically, to be categorized as an official Project Blue Book "unknown".
(Note: Taken from a list compiled by Don Berliner in 1974, which can be found at the link below the synopsis. A more extensive catalog of unknowns
based on the re-evaluation of the Blue Book files by Brad Sparks lists cases prior to this one and can be found
July 3, 1947; Harborside, Maine. 2:30 p.m. EDT. Witness: astronomer John Cole of South Brooksville, Me. Watched 10-15 seconds while ten very light
objects, with two dark forms to their left, moved like a swarm of bees to the northwest. A loud roar was heard.
The Blue Book Unknowns
Here are some details clipped out of the Project Blue Book Archive
The group of objects is described as having an angular size of 1 to 1.5 degrees, which would be about two to three times the diameter of the moon.
Here's a quick reference on the concept of angular size.
Documents relevant to this case can be found below.
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edit on 13-8-2012 by Orkojoker because: (no reason given)