The orbiter began aerobraking in March 2017 to lower its initial orbit of . Aerobraking is then used to circularize the orbit. An atmosphere can be used to slow a spacecraft by aerobraking. Another possibility was aerobraking into orbit around Titan. In 1993, it employed aerobraking techniques to lower its orbit. On 19 March 1991, aerobraking was demonstrated by the Hiten spacecraft. Without this hiatus, 'Surveyor' would complete aerobraking with its orbit in the wrong solar orientation. This was the first aerobraking maneuver by a deep space probe. Another technique to reduce Earth-brought propellant requirements is aerobraking. Special methods such as aerobraking or aerocapture are sometimes used for this final orbital adjustment. Another aerobraking maneuver was conducted on 30 March. In 2014, Altius began work on a magnetoshell aerocapture and aerobraking technology for cubesats. Mercury's lack of an atmosphere poses further challenges because it precludes aerobraking. Aerobraking is ruled out because Mercury has a negligible atmosphere. Aerobraking uses the atmosphere of the target planet to slow down.