Apophis, an Earth-crossing asteroid, fascinates both scientists and public since it regularly encounters the Earth. It has passed at 16.8 millions km in March 2021, and in April 2029 it will come as close as 31000 km to the Earth surface (12 times closer than Moon). Its trajectory is thus under close surveillance since its discovery in 2004.

orp eu 6 vignetteTwo astronomy networks are coming together to form Europe’s largest ground-based astronomy collaborative network: the ORP. The ORP will provide scientists with access to a wide range of instruments, promote training for young astronomers, and open the way to new discoveries. The CNRS will be responsible for coordinating the ORP, which is supported by €15 million of funding from the H2020 programme.

Reaching new heights with 100 consortium publications including the early exoplanet demographics release.

Vortex credit J Varga et al vignetteAn international team of astronomers led by researchers from the Netherlands has discovered a whirlwind of dust and pebbles in orbit around a young star. It is possible that a planet is forming in the pebbles. The team of scientists made the discovery during the time that designers and developers of an astronomical instrument get as a reward for their work. They will soon publish their findings in the journal Astronomy & Astrophysics.

The week of December 19, 2020 was the last nights of the CHARA/VEGA instrument, nights animated by Olli, Fred and myself.

betelgeuse100ans vignetteThe COVID-19 pandemic has severely disrupted the observations of the European Very Large Telescope (VLT) Observatory located in the Atacama Desert in Chile, with its 8m-large telescopes. The MATISSE instrumenthas been put into hibernation since early March 2020. It was built jointly by French, German and Dutch astrophysics laboratories, and was installed since 2018 at the VLT foyer. As soon as it was put back into service thanks to the hard work of the MATISSE team since the beginning of December, the flagship instrument of the Observatory of the Côte d'Azur in Nice is preparing to once again receive light from the largest telescopes in the world. But this date, as important as it is for the instrument itself and the scientific interest that results from it, is all the more so for the star that we observe this evening: Betelgeuse, the star of the stars .

endomagement astero vignetteUniversité de la Côte d’Azur, the Observatoire de la Côte d'Azur, the CNRS and the Laboratoire Énergies & Mécanique Théorique et Appliquée et l’Institut Jean Lamour of Université de Lorraine, conducted a study on the crack code of asteroid rocks published on December 1st, 2020 in Monthly Notices of the Royal Astronomical Society.

osirisREXIn an interplanetary faux pas, it appears some pieces of asteroid Vesta ended up on asteroid Bennu, according to observations from NASA’s OSIRIS-REx spacecraft. The new result sheds light on the intricate orbital dance of asteroids and on the violent origin of Bennu, which is a “rubble pile” asteroid that coalesced from the fragments of a massive collision.
“We found six boulders ranging in size from 5 to 14 feet (about 1.5 to 4.3 meters) scattered across Bennu’s southern hemisphere and near the equator,” said Daniella DellaGiustina of the Lunar & Planetary Laboratory, University of Arizona, Tucson. “These boulders are much brighter than the rest of Bennu and match material from Vesta.”
“Our leading hypothesis is that Bennu inherited this material from its parent asteroid after a vestoid (a fragment from Vesta) struck the parent,” said Hannah Kaplan of NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “Then, when the parent asteroid was catastrophically disrupted, a portion of its debris accumulated under its own gravity into Bennu, including some of the pyroxene from Vesta.”

orage jupiter vignetteNew Juno results suggest that the violent thunderstorms taking place in Jupiter’s atmosphere may form ammonia-rich hail, or ‘mushballs’, that play a key role in the planet’s atmospheric dynamics. This theory, developed using data from Juno’s microwave radiometer by the Juno team, is described in two publications led by a researcher at the Laboratoire Lagrange (CNRS/Observatoire de la Côte d’Azur/Université Côte d’Azur) with support from the CNES. The theory sheds light on some puzzling aspects of the meteorology of Jupiter and has implications for how giant planet atmospheres work in general. This, and related findings, are presented in a series of three articles published in the journals Nature and JGR Planets.

200610 MatsuwaIsland NASA WekimediaCC CopieUnderstanding the formation and evolution of the most primitive asteroids that populate the main asteroid belt is a crucial problem in planetary science; these objects being considered as the building blocks of the formation of our planetary system. The study of meteorites, in particular carbonaceous chondrites considered as rock fragments of these primitive bodies, has proved to be the most relevant approach. It is generally admitted that the parent bodies of carbonaceous chondrites were formed by accretion of primitive components of the protoplanetary disc: pre-solar grains, refractory inclusions rich in calcium-aluminum, chondrules, metal, ice, etc., during the first 10 million years from our solar system.

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