title: Observed Solar Pressure Perturbations of Echo I.
abstract: During the period 13 August to 22 August, day-to-day determinaitions of the average orbital elements of the 100-foot Echo I balloon, based on observations taken at the Jet Propulsion Laboratory's Goldstone tracking station, indicated a decrease in perigee height of 3.0 km/day and an increase in the eccentricity of 0.00038 per day.
authors.forename: D O
authors.initials: DO
authors.lastname: Muhleman
authors.forename: R H
authors.initials: RH
authors.lastname: Hudson
authors.forename: D B
authors.initials: DB
authors.lastname: Hoi Dridge
authors.forename: R L
authors.initials: RL
authors.lastname: Carpenter
authors.forename: K C
authors.initials: KC
authors.lastname: Oslund