Project 10073 Record Card — Arvada, Colorado, 10 August 1958

This document consists of a Project 10073 record card and associated teletype communications regarding a sighting that occurred on August 10, 1958, near Arvada, Colorado. A civilian witness reported observing three objects described as long, green, and iridescent, accompanied by an exhaust-like fire and a whining sound. The objects were observed moving in a straight path before suddenly disappearing. The duration of the sighting was estimated at 10 to 15 seconds. The report notes that the weather was clear with calm surface conditions. Official evaluation of the incident concluded that the objects were astronomical in nature, specifically identifying them as a meteor or bolide. The preparing officer further noted that the rocket portion of Sputnik and a meteor passed over during the sighting period, leading to the conclusion that the observer had sighted these phenomena. Handwritten notes on the document reiterate that the description provided by the witness was identical to that of a fireball or bolide.