Results 1 to 10 of about 282,415 (218)
Water ice and dust in the innermost coma of comet 103P/Hartley 2 [PDF]
Icarus, 2014 51 pages, 12 figures, accepted for publication in ...
Silvia 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.
Emanuele Simioni +2 more
exaly +10 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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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
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
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
Optical Imaging Polarimetry of Comet 21P/Giacobini–Zinner during Its 2018 Apparition
The Planetary Science Journal, 2023 We conducted polarimetric observations of comet 21P/Giacobini–Zinner in the optical wavelength region using the polarimetric imager PICO equipped with the 50 cm telescope for Public Outreach at the Mitaka Campus of the National Astronomical Observatory ...
Yoshiharu Shinnaka +4 more
doaj +1 more source