ABSTRACT
On 27 December 1984 an unprecedented sighting was made from Boulder, Colorado. High in the dawn sky, a comet-like object, brightest at the head and with a tail some 2° in angular ‘length’—approximately four times the angular diameter of the Sun or the moon-made a sudden and fleeting appearance. The phenomenon lasted for about four minutes before becoming too faint to be seen even with a low-light television camera and other extremely sensitive optical equipment that had recorded its brief life.
