Results 1 to 10 of about 2,542 (161)
Water ice and dust in the innermost coma of comet 103P/Hartley 2 [PDF]
Icarus, 2014 51 pages, 12 figures, accepted for publication in ...
S Protopapa +2 more
exaly +4 more sources
Post-perihelion photometry of dust grains in the coma of 67P Churyumov–Gerasimenko [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 Frattin, E. et al.-- Full list of authors: Frattin, E.; Cremonese, G.; Simioni, E.; Bertini, I.; Lazzarin, M.; Ott, T.; Drolshagen, E.; La Forgia, F.; Sierks, H.; Barbieri, C.; Lamy, P.; Rodrigo, R.; Koschny, D.; Rickman, H.; Keller, H. U.; Agarwal, J.; A'Hearn, M. F.; Barucci, M. A.; Bertaux, J. -L.; Da Deppo, V.; Davidsson, B.; Debei, S.; De Cecco, M.
G Cremonese, E Simioni, I Bertini
exaly +10 more sources
Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun [PDF]
Science, 2015 Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency’s Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.
A Rotundi +2 more
exaly +13 more sources
The Dust in the Coma of Comet Halley [PDF]
International Astronomical Union Colloquium, 1991 Abstract The interstellar dust model of comets is numerically worked out to satisfy several basic constraints provided by observations of comet Halley and to derive the porosity of coma dust. The observational constraints are: (1) the strengths of the 3.4 μm and 9.7 μm emission bands; (2) the relative amount of silicates to organic materials; (3 ...
Joniek I. Hage, J. Mayo Greenberg
openaire +1 more source
3.5 The Dust Coma of Comets [PDF]
International Astronomical Union Colloquium, 1976 AbstractAnalytical expressions for the dust entrainment in the limits of low and high gas production from cometary nuclei are derived. The resulting volume density is used to evaluate the dust production of Comets Encke and Kohoutek from IR-measurements. It is predicted, that the dust in solar direction was diffuse for Comet Kohoutek during approach to
K.W. Michel, T. Nishimura
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Frontiers in Physics, 2020 In this work, we present results that simultaneously constrain the dust size distribution, dust-to-gas ratio, fraction of dust re-deposition, and total mass production rates for comet 67P/Churyumov-Gerasimenko.
Raphael Marschall +7 more
doaj +1 more source
CONSTRAINTS ON THE INTRACLUSTER DUST EMISSION IN THE COMA CLUSTER OF GALAXIES [PDF]
The Astrophysical Journal, 2009 We have undertaken a search for the infrared emission from the intracluster dust in the Coma cluster of galaxies by the Multiband Imaging Photometer for Spitzer. Our observations yield the deepest mid and far-infrared images of a galaxy cluster ever achieved.
Kitayama, T. +9 more
openaire +3 more sources
Dust Outburst Dynamics and Hazard Assessment for Close Spacecraft–Comet Encounters
The Planetary Science Journal, 2021 Using the gas drag by sublimating cometary surface ices for the acceleration of dust particles and deceleration by the gravity field of the nucleus combined with basic laws of mechanics, the sizes, velocities, and number densities of escaping particles ...
Uwe Fink +6 more
doaj +1 more source
Unusual polarimetric properties for interstellar comet 2I/Borisov
Nature Communications, 2021 Polarimetry provides information about physical characteristics of cometary dust. Here, the authors show that the polarization of interstellar comet 2I/Borisov exceeds the typical values for comets, and this together with its polarimetrically homogenous ...
S. Bagnulo +8 more
doaj +1 more source
CO and CO2 Productions Rates of Comets Observed by NEOWISE within Year 1 of the Reactivated Mission
The Planetary Science Journal, 2023 We report on the observed fluxes of the comets detected by NEOWISE during the first year of operations after the spacecraft’s reactivation. The sample included 57 comets.
Adeline Gicquel +4 more
doaj +1 more source