منابع مشابه
Comet 162P/Siding Spring: A Surprisingly Large Nucleus
We present an analysis of thermal emission from comet 162P/Siding Spring (P/2004 TU12) measured during its discovery apparition in December 2004. The comet showed no dust coma at this time, so we have sampled emission from the comet’s nucleus. Observations using the “Mid-Infrared Spectrometer and Imager” (“MIRSI”) were performed at NASA’s Infrared Telescope Facility, where the peak of the comet...
متن کاملNEOWISE observations of comet C / 2013 A 1 ( Siding Spring ) as it approaches Mars
The Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) mission observed comet C/2013 A1 (Siding Spring) three times at 3.4 μm and 4.6 μm as the comet approached Mars in 2014. The comet is an extremely interesting target since its close approach to Mars in late 2014 will be observed by various spacecraft in-situ. The observations were taken in 2014 Jan., Jul. and Sep. when the comet...
متن کاملMAVEN IUVS observations of the aftermath of the Comet Siding Spring meteor shower on Mars
We report the detection of intense emission from magnesium and iron in Mars’ atmosphere caused by a meteor shower following Comet Siding Spring’s close encounter with Mars. The observations weremade with the Imaging Ultraviolet Spectrograph, a remote sensing instrument on the Mars Atmosphere and Volatile EvolutioN spacecraft orbiting Mars. Ionized magnesium caused the brightest emission from th...
متن کاملMetallic ions in the upper atmosphere of Mars from the passage of comet C/2013 A1 (Siding Spring)
We report the first in situ detection of metal ions in the upper atmosphere of Mars resulting from the ablation of dust particles from comet Siding Spring. This detection was carried out by the Neutral Gas and Ion Mass Spectrometer on board the Mars Atmosphere and Volatile Evolution Mission. Metal ions of Na, Mg, Al, K, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn, and possibly of Si, and Ca, were identi...
متن کاملReducing Hazardous Dust Exposure When Cutting Fiber-Cement Siding
Breathing dust that contains respirable crystalline silica can lead to silicosis, a deadly lung disease. Respirable dust is that fraction of the aerosol that is small enough to reach the deeper, gas-exchange regions of the lungs. No effective treatment exists for silicosis, but it can be prevented by controlling workers’ exposures to dust containing crystalline silica. Exposure to crystalline s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1972
ISSN: 0028-0836,1476-4687
DOI: 10.1038/239417a0