Results 131 to 140 of about 2,956 (261)

Galactic removal rates for long-period comets

The Astronomical Journal, 1990
The accuracy of first-order perturbation theory for long-period comets in a galactic tidal field is examined by comparing the theoretical predictions for changes in perihelion distance to the results of direct numerical integrations. It is found that the first-order theory agrees well with the integrations. 11 refs.
openaire   +1 more source

Amiodarone‐related thyroid dysfunction and associated outcomes in patients with heart failure—A nationwide cohort study

Journal of Internal Medicine, EarlyView.
Abstract Aim Amiodarone increases the risk of thyroid dysfunction, but the prognostic significance of this complication in patients with heart failure (HF) is uncertain. This study investigates the association between amiodarone‐related thyroid dysfunction and risk of HF hospitalization or death in a nationwide cohort.
Søren Lund Kristensen, Sam Aiyad Ali, Mads Ersbøll, Jawad Haider Butt, Rasmus Rørth, Lucas Malta Westergaard, Lauge Østergaard, Finn Gustafsson, Oren Caspi, Emil Fosbøl, Lars Køber, Christian Selmer   +11 more
wiley   +1 more source

Nongravitational forces on comets

, 1976
Methods are presented and discussed for determining the effects of nongravitational forces on the orbits of comets. These methods are applied to short-period and long-period comets.
Marsden, B. G.
core  

Statistical characteristics of comets based on their orbital period [PDF]

, 2019
In this thesis I present characteristics of comet orbits. In the beginning I will introduce relevant astronomical observations, basics of celestial mechanics and six elements of Kepler orbits.
Mikuš, Aljaž
core  

The First Quantitative Study of Cometary Tail Regrowth following a Coronal Mass Ejection-driven Disconnection Event

The Astrophysical Journal
Comet C/2023 P1 (Nishimura) was observed by the Solar Orbiter Heliospheric Imager (SoloHI), on board the Solar Orbiter spacecraft, from 2023 September 1 to 14.
Shaheda Begum Shaik, Guillermo Stenborg, Phillip Hess, Angelos Vourlidas, Karl Battams, Robin Colaninno   +5 more
doaj   +1 more source

Development of an Isoline Modeling Method for Extended Small Celestial Objects

Учёные записки Казанского университета: Серия Физико-математические науки
This article presents a method for modeling extended small celestial (ESC) objects, which are mainly cometary systems. Special attention was given to the possibility of analyzing their structure and physical properties in line with the modern theories of
A. O. Andreev, Yu. A. Nefedyev, N. Yu. Demina   +2 more
doaj   +1 more source

Search for impact ejecta at the Paleocene–Eocene boundary

Meteoritics &Planetary Science, EarlyView.
Abstract Almost 10 years have passed since microtektites and microkrystites were reported for the Paleocene–Eocene (P–E) boundary in drill cores and outcrop in New Jersey and in ODP Hole 1051B in the western North Atlantic. The glassy spherules were interpreted to reflect an impact trigger for the Paleocene–Eocene Thermal Maximum (PETM).
Birger Schmitz, Yue Cai, Shiyong Liao, Victoriano Pujalte, Ting Ruan, Robert P. Speijer, Ellen Thomas   +6 more
wiley   +1 more source

Down But Not Out: The Case of Long-period Comet C/2021 O3 (Panstarrs)

The Astronomical Journal
We combine ground- and space-based observations of long-period comet C/2021 O3 (Panstarrs; perihelion distance 0.287 au) in order to investigate its reported near-perihelion destruction.
David Jewitt, Jing Li, Michael Jaeger, Yoonyoung Kim   +3 more
doaj   +1 more source

Evaluating School‐Based Obesity Prevention Interventions in 6‐ to 12‐Year‐Old Children: A Scoping Review of All Reported Outcomes and Expert Consultation

Obesity Reviews, EarlyView.
ABSTRACT Introduction This scoping review aims to identify all outcomes reported in school‐based obesity prevention interventions in childhood. It serves as an essential first step towards developing an internationally agreed‐upon Core Outcome Set (COS), which defines what should be measured in all school‐based childhood obesity prevention studies ...
Teatske M. Altenburg, Lotte W. de Vries, Iris J. Grooten, Janneke van 't Hooft, Arend W. van Deutekom, Tessa Roseboom, Erica van den Akker, Michael Duncan, Ulf Ekelund, John J. Reilly, Lisa Reilly, Annette Stafleu, Martyn Standage, Mai J. M. Chinapaw, Deirdre M. Harrington   +14 more
wiley   +1 more source

A Multiwavelength Study of Comet C/2022 E3 (ZTF): Complementary ALMA and JWST Investigations of Water and Methanol in Cometary Comae

The Astronomical Journal
Long-period comets, which are often considered to be representative of material in the protoplanetary disk that formed the solar system, are ideal to investigate the question of chemical inheritance in astronomy. Determining the chemistry of comets, both
K. D. Foster, M. A. Cordiner, Nathan X. Roth, S. N. Milam, A. J. Remijan, N. Biver, J. Boissier, J. Crovisier, Y.-J. Kuan, D. C. Lis   +9 more
doaj   +1 more source