A bright white round object with no specific outlines due to the reflection and altitude.

I was looking up at the mast of my sailboat and I saw a bright round object stationary, (cantaloupe size) against the bright blue sky.  It stayed stationary approximately one minute then moved slowly southward.It then took on a metalic type reflection as it moved further away from the Sun.
Suddenly it accelerated at a tremendous speed and sped further south going up and over the Piute mountains.
It was clearly outlined against the dark mountains as it disapeared.
I am a retired electrical enngineer.