Results 61 to 70 of about 2,512 (186)

General Relativistic Study of Motion of Comets Particles Elliptical Gravitational Field [PDF]

Physics Access
Comets are small bodies consisting of aggregates of ice mixed with rock and dust. They are usually influenced by galactic forces and stellar encounters, and may have contributed to the formation of ice giants and transport gases across the solar system ...
Timothy Bulus, Chifu E Ndikilar, Halliru Ibrahim, Dayyabu Tafida   +3 more
doaj   +1 more source

Widely Distributed Pigeon Paramyxovirus Sub‐Genotypes Pose a Risk to Immunocompromised Humans

Zoonoses and Public Health, Volume 72, Issue 8, Page 713-724, December 2025.
ABSTRACT Introduction Pigeon paramyxovirus type 1 (PPMV‐1) is an antigenic variant of Avian Orthoavulavirus 1 (AOAV‐1) (Newcastle disease virus) with a global distribution that causes lethal infections in pigeon and dove species. AOAV‐1's infecting humans normally cause mild, self‐limiting conjunctivitis, but since 2003, PPMV‐1 has been associated with
Celia Abolnik, Michaela Hayes
wiley   +1 more source

Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au

The Astrophysical Journal Letters
Ejection 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, Xuanyu Hu, Jessica Agarwal, Carsten Güttler, Martin Rose, Horst Uwe Keller, Marco Fulle, Jakob Deller, Holger Sierks   +8 more
doaj   +1 more source

Specific effects on the reproductive function including fertility relevant for cumulative risk assessment of pesticide residues

EFSA Journal, Volume 23, Issue 12, December 2025.
Abstract According to the ‘EFSA‐SANTE Action Plan on Cumulative Risk Assessment for pesticides residues’, EFSA, with the support of a working group, undertook the identification of specific effects on male and female reproductive function, including fertility, that are considered relevant for grouping pesticide residues and for assessing ...
European Food Safety Authority (EFSA), Karine Angeli, Adeline Cavelier, Tamara Coja, Federica Crivellente, Anna Lanzoni, Luc Mohimont, Monica Nepal, Dimitra Nikolopoulou, Andrea Terron, Anna F. Castoldi   +10 more
wiley   +1 more source

A JWST Study of the Remarkable Oort Cloud Comet C/2017 K2 (PanSTARRS)

The Planetary Science Journal
Comets, 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, Dominique Bockélee-Morvan, David E. Harker, Michael S. P. Kelley, Nathan X. Roth, Diane H. Wooden, Stefanie N. Milam   +6 more
doaj   +1 more source

A Large Outburst, Coma Asymmetries, and the Color of Comet 243P/NEAT

The Planetary Science Journal
Water 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, Silvia Protopapa, Dennis Bodewits, Aren N. Heinze, Youssef Moulane, Quanzhi Ye, Bryce Bolin, Simon Conseil, Tony L. Farnham, Lori Feaga, Xing Gao, Chih-Hao Hsia, Emmanuel Jehin, Shrinivas R. Kulkarni, Russ R. Laher, Tim Lister, Frank J. Masci, Josiah Purdum, Bin Yang   +18 more
doaj   +1 more source

Dust Production Rates in Jupiter-family Comets: A Two Year Study with ATLAS Photometry

The Planetary Science Journal
Jupiter-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, Alan Fitzsimmons, Larry Denneau, Robert J. Siverd, Ken W. Smith, John L. Tonry, David R. Young   +6 more
doaj   +1 more source

Inner coma dust properties from polarization models

, 2013
Polarimetric observations of comets may be used to infer dust properties within comae through simulations. Recent progresses, in search for analogues for porous irregular cometary particles and in numerical simulations with such particles, are expected to provide a better understanding of the near-nucleus environment of Rosetta cometary target.
Levasseur-Regourd, Anny Chantal, Lindqvist, H., Brouet, Y., Hadamcik, Edith, Lasue, Jérémie, Määttänen, Anni, Renard, Jean-Baptiste   +6 more
openaire   +1 more source

Pre-perihelion Emergence of the CN Gas Coma in 3I/ATLAS Temporally and Spatially Resolved by the 7-dimensional Telescope

The Astrophysical Journal
We present time series medium-band ( R ∼ 20–40) observations of the third interstellar object (ISO) 3I/ATLAS (C/2025 N1) obtained with the 7-Dimensional Telescope, which enabled spatially resolved monitoring of its gas and dust activity from 2025 July to
Gregory S. H. Paek, Myungshin Im, Mankeun Jeong, Hyeonho Choi, Yoonsoo P. Bach, Masateru Ishiguro, Bumhoo Lim, Seo-Won Chang, Ji Hoon Kim, Jooyeon Geem, Willem B. Hoogendam   +10 more
doaj   +1 more source

The Extreme Activity in Comet Hale–Bopp (C/1995 O1): Investigations of Extensive Narrowband Photoelectric Photometry

The Planetary Science Journal
Conventional narrowband photoelectric photometry of Comet Hale–Bopp (1995 O1) was obtained on 99 nights from mid-1995 to early-2000, yielding gas and dust production rates over an unprecedented range of time and distance. The appearance of Hale–Bopp (H-B)
David G. Schleicher, Peter V. Birch, Tony L. Farnham, Allison N. Bair   +3 more
doaj   +1 more source