Mid-course corrections were made on 17 June and 20 November. Scientific instruments were generally turned on for about 30 minutes near periapsis. Data was sent back for many months. It was announced that Mars 2 and 3 had completed their missions by 22 August 1972. More details Mars probe intended to conduct of a series of scientific investigations of the planet Mars and the space around it.
Parameters are for Mars orbit.
The Mars 3 orbiter also carried a French-built experiment which was not carried on Mars 2. Called Spectrum 1, the instrument measured solar radiation at metric wavelengths in conjunction with Earth-based receivers to study the cause of solar outbursts. The Spectrum 1 antenna was mounted on one of the solar panels. A mid-course correction was made on 8 June. However, after 20 sec the instruments stopped working for unknown reasons.