In 2001, a group of astronomer discovered that the L5 Trojan asteroid (617) Patroclus is in fact made of two components. In 2006, Using Laser Guide Star Adaptive Optics System, we showed that those two components orbit around the center of mass of the system in ~4 days at 680 km describing a circular orbit. We named the second component Menoetius, the argonaut father of Patroclus in the greek mythology. From the estimate of the size, we found out that the components are less dense than icy water, with a grain density very close to satellites of giant planets (like Amalthea, moon of Jupiter).

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Because Patroclus has a different color and density than (624) Hektor, we speculated that it could be a captured Jupiter-Saturn asteroid which ended up in the gravitational well of the Sun-Jupiter system during the migration of the giant planets 3.7 Billion years ago. Its binary nature could be the result of tidal disruption when primitive asteroid had a close encounter with Jupiter before the capture. Ultimately, we will need to send a spacecraft there to really understand this system. NASA has pre-selected the LUCY new discovery mission which could flyby this binary Trojan asteroid in 2033.

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By clicking “Accept and Continue” below, (1) you consent to these activities unless and until you withdraw your consent using our rights request form, and (2) you consent to allow your data to be transferred, processed, and stored in the United States. A five month investigation by the Associated Press has discovered that small quantities of drugs, including, sex hormones, and anti-seizure compounds, have been found in public drinking water supplied to over 40 million Americans across the US. While the concentrations are so small they have to be measured in parts per billion or even parts per trillion, and water companies insist these levels are within safety limits, the AP said the long term effects on people's health of so many prescription drugs and over the counter medicines such as acetaminophen (paracetamol) and ibuprofen, even in tiny amounts, are starting to worry scientists. Drugs and their derivatives get into the drinking water supply because when people on medication go to the toilet they excrete whatever the body does not absorb and any matabolized byproducts.