DARMSTADT, Germany — The European Space Agency lost contact with an experimental Mars probe shortly before its planned landing on the red planet Wednesday. Scientists said that wasn’t a good sign for the Schiaparelli lander, but it was too soon to give up on the craft.

ESA successfully put Schiaparelli’s mother ship, which will analyze the Martian atmosphere, into orbit. But several hours after the lander was supposed to have touched down, there was no firm word on its fate.

‘‘The signal [from Schiaparelli] went through the majority of the descent phase but it stopped at a certain point that we reckon was before the landing,’’ Paolo Ferri, ESA’s head of operations, said at mission control in Darmstadt, Germany.

‘‘To conclude more on this, because there could be many reasons for that, we need more information,’’ he said. ‘‘It’s clear that these are not good signs.’’

An update is expected on Thursday, he said.

Schiaparelli was meant to test technology for a future European robotic mission to Mars. It is part of a larger international mission called ExoMars that will help in the hunt for life on the planet.

Landing a spacecraft on Mars is notoriously difficult and several past missions have failed, including the European Space Agency’s previous attempt in 2003 with the rover Beagle 2. It made it to Mars but its solar panels didn’t unfold properly, preventing it from communicating.