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| Japan lands on Moon but glitch threatens mission | Japan lands on Moon but glitch threatens mission |
| (32 minutes later) | |
| Artwork: Jaxa has become the fifth national space agency to land on the Moon | Artwork: Jaxa has become the fifth national space agency to land on the Moon |
| A Japanese robot has successfully touched down on the Moon but problems with its solar power system mean the mission may live for just a few hours. | A Japanese robot has successfully touched down on the Moon but problems with its solar power system mean the mission may live for just a few hours. |
| The Smart Lander for Investigating Moon (Slim) put itself gently on the lunar surface near an equatorial crater. | The Smart Lander for Investigating Moon (Slim) put itself gently on the lunar surface near an equatorial crater. |
| The feat made the Asian nation only the fifth country to soft-land on Earth's natural satellite, after the US, the Soviet Union, China and India. | The feat made the Asian nation only the fifth country to soft-land on Earth's natural satellite, after the US, the Soviet Union, China and India. |
| Engineers are now battling to save the mission, however. | Engineers are now battling to save the mission, however. |
| For reasons not yet fully understood, the craft's solar cells will not generate electricity. | For reasons not yet fully understood, the craft's solar cells will not generate electricity. |
| This leaves Slim totally reliant on its batteries and these will eventually discharge. When they do, the craft will go silent. It won't receive commands and it won't be able to talk to Earth. | This leaves Slim totally reliant on its batteries and these will eventually discharge. When they do, the craft will go silent. It won't receive commands and it won't be able to talk to Earth. |
| Engineers are currently prioritising activities. | Engineers are currently prioritising activities. |
| They've turned off heaters and are pulling down pictures from the craft. They're also retrieving data that will tell them how well the landing software worked. | They've turned off heaters and are pulling down pictures from the craft. They're also retrieving data that will tell them how well the landing software worked. |
| Japanese space agency (Jaxa) officials will not immediately give up on Slim if it does fall silent. It's always possible the solar cells have somehow become oriented in a way that prevents them from seeing the Sun. | Japanese space agency (Jaxa) officials will not immediately give up on Slim if it does fall silent. It's always possible the solar cells have somehow become oriented in a way that prevents them from seeing the Sun. |
| As light angles change on the Moon, it was possible Slim could come back to life, the officials said. | As light angles change on the Moon, it was possible Slim could come back to life, the officials said. |
| The Japanese public celebrated the nation's soft landing | The Japanese public celebrated the nation's soft landing |
| Asked at a news conference whether Japan could justifiably claim a soft landing, Jaxa vice president, Hitoshi Kuninaka, said it could. | Asked at a news conference whether Japan could justifiably claim a soft landing, Jaxa vice president, Hitoshi Kuninaka, said it could. |
| "If powered descent wasn't successful, then there would have been a collision with the surface at a very high speed and spacecraft function would have been completely lost," he told reporters. | "If powered descent wasn't successful, then there would have been a collision with the surface at a very high speed and spacecraft function would have been completely lost," he told reporters. |
| "But it is still sending data properly to us, which means our original objective of a soft landing was successful." | "But it is still sending data properly to us, which means our original objective of a soft landing was successful." |
| Slim was carrying two small rovers and telemetry indicates it managed to eject these as planned just before touch-down. | Slim was carrying two small rovers and telemetry indicates it managed to eject these as planned just before touch-down. |
| The craft, which carries an infrared camera, was to spend the next fortnight studying the local geology. How much of this investigation can be achieved in the time available is uncertain. | The craft, which carries an infrared camera, was to spend the next fortnight studying the local geology. How much of this investigation can be achieved in the time available is uncertain. |
| An artist's impression of the two rovers on board | An artist's impression of the two rovers on board |
| Statistically, it's proven very hard to land on the Moon. Only about a half of all attempts have succeeded. | Statistically, it's proven very hard to land on the Moon. Only about a half of all attempts have succeeded. |
| Jaxa put its faith in new precision-navigation technologies. | Jaxa put its faith in new precision-navigation technologies. |
| The lander's onboard computer used rapid image processing and crater mapping to avoid hazards to reach its touch-down point. | The lander's onboard computer used rapid image processing and crater mapping to avoid hazards to reach its touch-down point. |
| Engineers had wanted to get within 100m (330ft) of their targeted location and will now be studying data to see how well Slim performed. But the early indications are that the technologies worked as designed. | Engineers had wanted to get within 100m (330ft) of their targeted location and will now be studying data to see how well Slim performed. But the early indications are that the technologies worked as designed. |
| "Looking at the trace data, I believe that SLIM most certainly achieved a pinpoint landing with 100-meter accuracy. Of course, as we informed you in advance, it would take about a month to analyse the information accurately," Mr Kuninaka said. | |
| Slim began its descent manoeuvres from an altitude of 15km (9 miles) at midnight into Saturday, Japan Standard Time (15:00 GMT, Friday). Touchdown occurred just after 15:20 GMT. | Slim began its descent manoeuvres from an altitude of 15km (9 miles) at midnight into Saturday, Japan Standard Time (15:00 GMT, Friday). Touchdown occurred just after 15:20 GMT. |
| The landing location, near Shioli Crater, is currently bathed in sunlight but the darkness of lunar night will return there at the end of the month. | The landing location, near Shioli Crater, is currently bathed in sunlight but the darkness of lunar night will return there at the end of the month. |
| When that happens, temperatures will plummet to levels that are very capable of breaking electronic circuit boards. | When that happens, temperatures will plummet to levels that are very capable of breaking electronic circuit boards. |
| The targeted landing site was on the slopes approaching Shioli Crater, which is just south of the Moon's equator | The targeted landing site was on the slopes approaching Shioli Crater, which is just south of the Moon's equator |
| Jaxa has twice landed robots on asteroids, so this Moon touchdown is another feather in its cap. | Jaxa has twice landed robots on asteroids, so this Moon touchdown is another feather in its cap. |
| It will be playing significant roles in the US space agency's (Nasa) Artemis programme, which seeks to put humans back on the lunar surface after a gap of more than half a century. | It will be playing significant roles in the US space agency's (Nasa) Artemis programme, which seeks to put humans back on the lunar surface after a gap of more than half a century. |
| Last year, a private Japanese company, iSpace, had a go at landing. Its Hakuto-R craft crashed when the onboard computer became confused about its altitude above the Moon. | Last year, a private Japanese company, iSpace, had a go at landing. Its Hakuto-R craft crashed when the onboard computer became confused about its altitude above the Moon. |
| On Thursday, the private American company Astrobotic disposed of its Peregrine landing craft in Earth's atmosphere. A propulsion fault prevented it from even trying to make a touch-down attempt. | On Thursday, the private American company Astrobotic disposed of its Peregrine landing craft in Earth's atmosphere. A propulsion fault prevented it from even trying to make a touch-down attempt. |
| Related Topics | Related Topics |
| Japan | Japan |
| Space | Space |
| The Moon | The Moon |