PASADENA, Calif.  One day after a picture-perfect landing on Mars, NASA’s Phoenix lander seemed Monday to be in perfect health.

The spacecraft has redundant systems to survive the failure of some components, and mission controllers have drawn up contingency plans for possible problems.

Image An image from the Mars Reconnaissance Orbiter shows the Phoenix spacecraft parachuting to Mars on Sunday. Credit... NASA, via Agence France-Presse — Getty Images

“Up to this point, we haven’t needed any of it,” said Edward Sedivy, the Phoenix program manager at Lockheed Martin Space Systems in Denver, which built the spacecraft.