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Rosetta et après: le futur de l'exploration des comètes.
Crovisier, J.
This article reviews the results obtained by the Rosetta space probe on comet 67P/Churyumov-Gerasimenko and the expectations of future space exploration of comets.
La poussiere cosmique
Rotundi, Alessandra
Since the 1970s, dust has been collected in the terrestrial environment in the hope of studying dust particles witnessing the primordial protoplanetary nebula materials. In the 21th century, cometary dust was collected by the Stardust/NASA probe in the coma of comet 81P/Wild-2 and returned to Earth. Cometary dust was also analyzed in situ by Roset…
Le premier ciel de Gaia
Arenou, Frederic; Turon, Catherine
On 14 September 2016, the first data release of the ESA's Gaia mission has been published. Based on raw data collected between 25 July 2014 and 16 Septembre 2015, i.e. only over the first 14 months of mission, this first "Gaia sky" includes the accurate positions and Gaia magnitudes of more than a billion objects: it is already the largest all-sky…
De la boule de neige sale au canard en caoutchouc noir, 67P/ Churyumov Gerasimenko, From the dirty snowball to the rubber black duck, 67P/ Churyumov Gerasimenko
Borg, Janet
Rosetta has ended its mission on 30 September 2016 with a controlled impact in the Ma'at region on the small lobe of comet 67P/ Churyumov Gerasimenko. Since its arrival in the vicinity of the comet in august 2014, Rosetta has spent more than two years living with the comet, investigating its nucleus and its environment. It has witnessed how a come…
Hector Servadac et les comètes de Jules Verne.
Crovisier, J.
"Hector Servadac" ("Off on a Comet") is a novel by Jules Verne published in 1877. Anticipating the Rosetta mission, it fantasizes about the in situ exploration of a comet by a small group of castaways. This novel illustrates what was publicly known on comets at that time.
IUE: un observatoire en orbite.
Gry, Cecile
The acquisition of ultraviolet data by the geosynchronous IUE satellite since its launch in 1978 is discussed, with emphasis on the procedure for obtaining IUE data from the Vilspa station near Madrid. Images are obtained by IUE every two hours on the average, with exposures lasting from 0.4 sec to 21 hours. UV spectra are derived from the images …
Observations de comètes faibles avec IUE.
Festou, M.
Spectral observations of eight comets, including seven periodic comets, made in the range 1150-3400 A with the IUE satellite are presented. Comet Bradfield, the sole nonperiodic comet observed, is found to exhibit strong OH and atomic hydrogen emissions from the decomposition of water, along with oxygen, carbon, sulfur, carbon disulfide, C2 and CO…