Results 91 to 100 of about 33,036 (248)

Effects of the Planar Galactic Tides and Stellar Mass on Comet Cloud Dynamics

, 2009
We report the first results of a research program to explore the sensitivity of the orbits of Oort cloud comets to changes in the strength of the Galactic tides in the plane of the disk and also to changes in the mass of the host star.
Gonzalez, Guillermo, Masi, Marco, Secco, Luigi   +2 more
core   +1 more source

Micronuclei and Other Nuclear Abnormalities in Patella Limpet as Biomarkers of Cytogenotoxicity in Recreational Port Waters

Environmental Toxicology, EarlyView.
ABSTRACT Over the past decades, the growth in human population and economic activities has led to an increase in maritime traffic. This rise puts additional pressure on marine environments, vessel fuel spills being considered to have a major impact on the ecosystem.
Carlos Valiente‐Diaz, Eva Garcia‐Vazquez, Verónica Soto‐López   +2 more
wiley   +1 more source

Characterization of the Dust and Sodium Tails of Comet C/2020 F3 (NEOWISE) from Parker Solar Probe and Amateur Observations

The Planetary Science Journal
Comet C/2020 F3 (NEOWISE) reached perihelion on 2020 July 3 at 0.29 au and exhibited a highly structured dust tail. Using a simplified Finson–Probstein model, structures such as striae, observed in the tail in images obtained by the Parker Solar Probe ...
Qasim Afghan, Geraint H. Jones, Karl Battams, Oliver Price, Andrew J. Coates   +4 more
doaj   +1 more source

2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud

, 2009
We report the discovery of a minor planet (2006 SQ372) on an orbit with a perihelion of 24 AU and a semimajor axis of 796 AU. Dynamical simulations show that this is a transient orbit and is unstable on a timescale of 200 Myrs.
Andrew C. Becker, Andrew W. Puckett, Benjamin Dilday, Bernstein, Brown, Brown, Daniel J. Oravetz, Dmitry Bizyaev, Donald P. Schneider, Dones, Duncan, Fernandez, Francis, Frieman, Gleason, Green, Gunn, Gunn, Ivezić, Ivezić, Jewitt, Joshua A. Frieman, Kaike Pan, Kaiser, Levison, Lupton, Millis, Morbidelli, Nathan A. Kaib, Oort, Pier, R. Lynne Jones, Shannon Watters, Thomas Quinn, Tiscareno, Veillet, Volk, Weissman, York   +38 more
core   +1 more source

Cytogenotoxic Effects of Fluopyram in Allium cepa Root Cells Involving Microtubule Disruption

Environmental Toxicology, EarlyView.
ABSTRACT Fluopyram is a next‐generation fungicide widely used in agriculture; however, its persistence in soils and mobility toward aquatic systems have raised concerns regarding potential ecotoxicological risks. This study evaluated the cytogenotoxic effects of a commercial fluopyram‐based pesticide formulation on Allium cepa root meristem cells ...
Carlos Filipe Camilo‐Cotrim, Natanael Alves da Silva, Gabriela Gomes Lima, Igor Rodrigues Vasconcelos, Luciana Souza Ondei, Elisa Flávia Luiz Cardoso Bailão, Antônio Sérgio Nakao de Aguiar, Marcelino Benvindo‐Souza, Leonardo Luiz Borges, Virgínia Damin, Luciane Madureira Almeida   +10 more
wiley   +1 more source

A new activity index for comets [PDF]

An activity index, AI, is derived from observational data to measure the increase of activity in magnitudes for comets when brightest near perihelion as compared to their inactive reflective brightness at great solar distances.
Whipple, Fred L.
core   +2 more sources

Photometry of comet C/2011 L4 (PANSTARRS) at 4.4 - 4.2 AU heliocentric distances

, 2014
We present an analysis of the photometric data of comet C/2011 L4 (PANSTARRS) observed at heliocentric distance of 4.4 - 4.2 AU. The comet C/2011 L4 (PANSTARRS) shows one significant activity, despite of its quite large heliocentric distance.
Borysenko, Serhii, Golovin, Alex, Ivanova, Oleksandra   +2 more
core   +1 more source

Meteor outbursts from long-period comet dust trails [PDF]

Icarus, 2003
Long-period comets have narrow 1-revolution old dust trails that can cause meteor outbursts when encountered by Earth. To facilitate observing campaigns that will characterise and perhaps help find Earth threatening long-period comets from their trace of meteoric debris, we use past accounts of outbursts from 14 different showers to calculate the ...
openaire   +1 more source

Psychedelic‐assisted treatment for substance use disorder: A narrative systematic review

Addiction, EarlyView.
Abstract Background and aims This is the first systematic review of the extant literature on all major psychedelic‐assisted treatment for alcohol use disorder (AUD), tobacco use disorder (TUD) and other substance use disorders (SUD). We aimed to summarise the evidence for efficacy of psychedelic‐assisted treatment for AUD, TUD, and SUD; to evaluate its
Theodore Piper, Francesca Small, Sam Brown, Michael Kelleher, Luke Mitcheson, James Rucker, Allan H. Young, John Marsden   +7 more
wiley   +1 more source

Modeling Ice and Dust in Comet C/2017 K2 (Pan-STARRS)’s Coma

The Planetary Science Journal
C/2017 K2 (Pan-STARRS) is a long-period comet that has been active since 24 au inbound and likely as far out as 35 au, far beyond where the sublimation of water ice can power cometary activity.
Megan Firgard, Theodore Kareta
doaj   +1 more source