"But we still have more missions to achieve and it's too early for us to celebrate".
Friday's mission was the riskiest for Hayabusa2, as it had to immediately get away so it would not get hit by flying shards from the blast.
Hayabusa2 successfully released as scheduled the so-called "small carry-on impactor" - a cone-shaped device capped with a copper bottom - as the probe hovered just 500 metres (1,650 feet) above the asteroid Ryugu.
The probe then moved out of the blast zone, ducking behind the other side of the same asteroid - Ryugu, or 'Dragon Palace, ' located nearly 300 million kilometers from Earth.
After dropping the impactor, the spacecraft was to move quickly to the other side of the asteroid to avoid flying shards from the blast.More news: All-new Ford Kuga Unveiled; Gets Three Hybrid Powertrain Options
It's not the first time that Hayabusa2 has "attacked" Ryugu during its nine months at the asteroid.
It will take two weeks for the probe itself to return to its "home position" near Ryugu after the detonation and impact.
In this computer graphics image released by the Japan Aerospace Exploration Agency (JAXA), the Hayabusa2 spacecraft is seen above on the asteroid Ryugu.
The size of the crater will depend on the composition of the asteroid's surface - as many as 10 metres in diameter if it is sandy, and about 3 metres across if it is rocky, according to the space agency. In a 2005 "deep impact" mission to a comet, NASA observed fragments after blasting the surface but did not collect them.
A Japanese spacecraft has "bombed" a speeding asteroid 187m (300m km) from earth in an attempt to retrieve material that could offer scientists new clues about the origins of life on earth.More news: Google Assistant gets the voice of a Legend today
Hayabusa2 successfully touched down on a tiny flat surface on the boulder-rich asteroid in February, when the spacecraft collected surface dust and debris.
The asteroid is thought to contain relatively large amounts of organic matter and water from some 4.6 billion years ago when the solar system was born.
Hayabusa2 is scheduled to leave the asteroid at the end of the year and return to Earth with underground samples by the end of 2020.
The photos showed a spray of fine particles from dozens of meters from a spot on the asteroid, named Ryugu.
If successful, it would be the first time a spacecraft took such materials.More news: Pakistan bans IPL broadcasting across country
Takashi Kubota, an engineering researcher, said the probe's use of explosives and its "acrobatic" evasive manoeuvres were "unprecedented" and he hoped the mission would give scientists a rare peek inside an asteroid.