To date, there has been only one soft touchdown on an asteroid, and that was NASA's Near Earth Asteroid Rendezvous-Shoemaker spacecraft, which landed on the asteroid Eros in 2001.
The two Minerva-II robots are created to take advantage of the asteroid's low gravity, making long hops across its surface.
"They will become the first ever mobile robots to conduct observations on an asteroid", according to Japanese newspaper The Mainichi.
The shadow of a Minerva-II lander, caught as it descends to the surface of the asteroid Ryugu.
After the landing, the two rovers - measuring just 18 centimetres across - will make small hops on the asteroid and capture images of the surface and measure temperatures, the Japan Aerospace Exploration Agency (JAXA) said.
JAXA officials confirmed they had received a clear signal from the MINERVA-II1 rovers after they were deployed, but they lost contact with them, possibly because of Ryugu's rotation. "We don't have confirmation yet, but we are very, very hopeful", JAXA project manager Yuichi Tsuda told reporters. We don't have confirmation yet, but we are very, very hopeful.
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"Most likely, this is due to the rotation of the Ryuga, and MINERVA-II1 is on the far side of the asteroid, said the Agency".
The probes - which can jump to move around - will investigate the asteroid's surface by taking pictures and using other instruments.
We are now working to confirm if there are images capturing the MINERVA-II1 landing.
From this crater, the probe will collect "fresh" materials unexposed to millennia of wind and radiation, hoping for answers to some fundamental questions about life and the universe, including whether elements from space helped give rise to life on Earth.
The cautious announcement came after a similar JAXA probe in 2005 released a rover which failed to reach its target asteroid.
The explorer was launched at the Tanegashima Space Centre in southern Japan in December 2014.