Results 91 to 100 of about 296,727 (213)
Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au
The Astrophysical Journal LettersEjection of large boulder-like debris is a vigorous form of cometary activity that is unlikely induced by water ice out-gassing alone but rather associated with the sublimation of super-volatile ices.
Xian Shi +8 more
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Time-domain photometry and activity evolution of interstellar comet 3I/ATLAS with BHTOM
Astronomy & AstrophysicsContext. Time-domain photometric monitoring is essential for characterizing cometary evolution, particularly for rare interstellar objects with limited observing opportunities. Aims.
Gillan A. Fraser +71 more
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Three-dimensional cometary dust coma modelling in the collisionless regime: strengths and weaknesses [PDF]
, 2007 Inverse coma and tail modelling of comets based on the method developed by Finson & Probstein is commonly used to analyse cometary coma images. Models of this type often contain a large number of assumptions that may not be constrained unless wide ...
Foster, M. J., Green, S. F.
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A JWST Study of the Remarkable Oort Cloud Comet C/2017 K2 (PanSTARRS)
The Planetary Science JournalComets, during their journeys into the inner solar system, deliver volatile gases, organics, and particulates into their comae that provide crucial information for assessing the physicochemical conditions in the outer disk from which they formed. Here we
Charles E. Woodward +6 more
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JWST and Gemini Observations of the Active Centaur 450P/LONEOS: Nucleus and Coma Characterizations
The Planetary Science JournalBetween 2019 and 2024, we used the Gemini-N and JWST observatories to conduct a detailed case study of the active Centaur 450P/LONEOS, whose orbit was significantly altered by a close Saturn encounter in 1992.
Charles A. Schambeau +18 more
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, 2014 International audienceGIADA (Grain Impact Analyzer and Dust Accumulator) is an in-situ instrument, on-board the ROSETTA spacecraft, designed to measure the dynamical properties of the dust grains emitted by the comet 67P/Churiumov-Gerasimenko (hereafter ...
Mazzotta Epifani, E. +14 more
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SPHEREx Pre-perihelion Mapping of H2O, CO2, and CO in Interstellar Object 3I/ATLAS
The Astrophysical Journal LettersFrom 2025 August 1 to August 15 UT, the SPHEREx spacecraft observed interstellar object 3I/ATLAS. Using R = 40–130 spectrophotometry at λ = 0.7–5 μ m, lightcurves, spectra, and imaging of 3I were obtained.
Carey M. Lisse +37 more
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Phase angle dependence of the dust cross section in a cometary coma
Context. Rosetta/OSIRIS took optical measurements of the intensity of scattered light from the coma of 67P/Churyumov-Gerasimenko over a wide range of phase angles.
F. Keiser, J. Markkanen, J. Agarwal
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A Large Outburst, Coma Asymmetries, and the Color of Comet 243P/NEAT
The Planetary Science JournalWater ice is a fundamental building material of comets and other bodies in the outer solar system. Yet the properties of cometary water ice are challenging to study, due to its volatility and the typical distances at which comets are observed.
Michael S. P. Kelley +18 more
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Dust Production Rates in Jupiter-family Comets: A Two Year Study with ATLAS Photometry
The Planetary Science JournalJupiter-family comets (JFCs) exhibit a wide range of activity levels and mass loss over their orbits. We analyzed high-cadence observations of 42 active JFCs with the wide-field Asteroid Terrestrial-impact Last Alert System (ATLAS) in 2020–
A. Fraser Gillan +6 more
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