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IN THE FIVE or so days since Philae, the washing machine-sized lander nestled in a shady ditch on comet 67P/Churyumov�Gerasimenko, called home, mission control has been a flurry of analysis and planning. �In everyone�s life there are a few days that count for more than the others,� says Jean-Pierre Bibring, lead lander scientist. For the team running Philae and its orbiting counterpart Rosetta, these have been those days. Yesterday at a press conference Bibring and colleagues shared plans for the science their probes can now do. Or rather, the science they hope it�ll do. There are, of course, problems. As of Wednesday, Philae has sent information to the team just twice: on June 13 for 85 seconds (during the fourth wake up attempt) with a robust signal; and on June 14 for four minutes with a weak signal. The information it sent was part of a historical cache, diagnostic and other data Philae captured during brief periods of wakefulness. Philae has more of that data to send, though none has been forthcoming, leaving the mission team in the position of anxious parents whose traveling child hasn�t called or emailed in a while. For now, though, at least they know that the lander is in fine health. �We got only good news from Philae,� says Barbara Cozzoni, the engineer who has been Philae�s main driver. All systems are working, the lander has not been over-stressed by extreme temperatures, and the solar panels are collecting energy. But the last successful communication link between Philae and Rosetta was tenuously weak. Efforts to re-establish a connection since then have failed. Rosetta operators planned on Wednesday to reorient the spacecraft�Philae�s relay antenna to Earth�in the hope of better aligning it with the lander. The maneuver will be tricky. Comet 67P/Churyumov�Gerasimenko is approaching the sun, and as its temperature goes up it grows more active, spewing jets of dust and gas into Rosetta�s flightpath. �You can�t see very much, and it�s not very safe,� says Elsa Montagnon, head of operations for Rosetta� flight control. |
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