Small white object at high altitudeObject appeared almost directly overhead at high altitude but extremely small with undetermined shape. White in color against clear sky but reflected in the sun momentarily. Object appeared to move slightly in a very small circle and then disappeared. Observation made after hearing a small aircraft pass overhead at an altitude of eight to ten thousand feet. Object appeared much higher than the passing aircraft.Suspected bird but discounted due to no further visual contact.Suspected trash in a dust devil at several thousand feet above the ground but undetermined at this time.No dust devils in the immediate area however conditions were nominal for this condition.Suspected high altitude weather or research balloon. Undetermined at this time.Checked database for Iridium flares but no reports of any for date and time at this location.No other aircraft observed in the area and conditions were clear sky with visibility more than 50 miles. Winds south at ten to fifteen mph and temperature 95F.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))