Rosetta selfie with Comet 67/P in the background
History was made yesterday as a spacecraft the size of a fridge executed the first successful landing on a comet. The European Space Agency confirms that at about 16:00 GMT the unmanned Philae space probe touched down on the surface of comet 67P/Churyumov-Gerasimenko at the landing site known as Agilkia. The comet and spacecraft are 510 million km from Earth, so the news of the landing took 28 minutes and 20 seconds to reach mission control in Darmstadt, Germany.
The day before the landing, the 100 kg Phiale was turned on and its batteries charged for the first time since leaving Earth. There were some initial glitches as the batteries warmed more slowly than anticipated, but the spacecraft soon warmed up to its operational temperature. As the Rosetta mothership carrying Philae maneuvered into position, mission control carried out flight checks on the two spacecraft, sent command updates to Philae that allowed it to navigate autonomously to the landing site, and cleared the landing maneuver after a series of go/no decisions with the lander declared ready for separation at 02:35 GMT.
Despite a transient fault in the cold gas thruster aboard Philae, at 07:35 GMT Rosetta completed its final maneuver and the final permission was given to proceed with landing. At 09:03 Philae separated from Rosetta. During course correction maneuvers, communications with Earth were interrupted from either spacecraft, so they were programmed to operate autonomously…
First photo from Philae lander
…Since its arrival on August 6, the orbiter has been mapping the comet in search of a suitable landing site for the Philae lander.
…The landing…was based on a window where there would be enough sunlight to power the lander, but not so much as to make the comet dangerously active. Meanwhile, the site was chosen based on a balance between the scientific value of the area against the safety of the lander. Agilkia has very little slope, few boulders, and abundant sunlight, yet contains many features of interest.
ESA says that Philae has begun taking panoramic images as part of a two-and-a-half day science mission using its suite of 10 instruments, which could be extended if its solar panels are able to charge its batteries.
Bravo. Kudos to ESA for having the foresight and dedication to basic science and research required to fund and manage this project.
Click through to the article and more than 2 dozen photos from the history of the Rosetta project.
Thanks, Ursarodinia, Mike – GMTA