Results 101 to 110 of about 33,036 (248)
Will Comet ISON (C/2012 S1) Survive Perihelion?
, 2013 On 2013 November 28 Comet ISON (C/2012 S1) will pass by the Sun with a perihelion distance of 2.7 solar radii. Understanding the possible outcomes for the comet's response to such a close passage by the Sun is important for planning observational ...
Knight, Matthew M., Walsh, Kevin J.
core +1 more source
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
Quality indicators for structure and process in peri‐operative care: a systematic review
Anaesthesia, EarlyView.Summary Introduction Quality indicators are essential for benchmarking, quality assurance and driving improvement in healthcare. Many indicators exist for peri‐operative care but their relevance and evidence base vary. This systematic review updates a review published 10 years ago.
Sarah Kelly +8 more
wiley +1 more source
The primary mandate of NASA is the study of the nature and origin of the solar system. The study of the comets provide information about conditions and processes at the beginning of the solar system.
Fanale, Fraser +2 more
core +2 more sources
Extrasolar comets : the origin of dust in exozodiacal disks?
, 2016 Comets have been invoked in numerous studies as a potentially important source of dust and gas around stars, but none has studied the thermo-physical evolution, out-gassing rate, and dust ejection of these objects in such stellar systems.
Augereau, Jean-Charles +2 more
core +3 more sources
Early long-period comets: their discovery and flux [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 By analysing recent comet catalogues, it is found that the flux of long-period comets to the inner solar system has been reasonably constant throughout the last two millennia. There is no evidence of periods of enhanced activity, or comet showers. The acuity of northern hemisphere naked-eye observers throughout the era of pre-telescopic astronomy was ...
openaire +1 more source
Archaeometry, EarlyView.Abstract This study examines the continuity and change in harvesting practices between the Late Pre‐Pottery Neolithic B (LPPNB) and the Early Pottery Neolithic at Qminas, north‐western Levant, through a traceological analysis of flint sickles. By combining qualitative traceological analysis with quantitative functional approaches, we demonstrate that ...
Fiona Pichon +3 more
wiley +1 more source
On the Dynamics of Comets in Extrasolar Planetary Systems
, 2019 Since very recently, we acquired knowledge on the existence of comets in extrasolar planetary systems. The formation of comets together with planets around host stars now seems evident.
Beust +33 more
core +1 more source
Dynamical history of the observed long-period comets [PDF]
Astronomy & Astrophysics, 2001 We present results of some numerical studies on the dynamical history of a large number of observed long-period comets. In our investigations we include all comets with good quality orbits. We calculated barycentric, original orbital elements for comets at a distance of 250 AU from the Sun and then followed the motion of each comet (elliptic orbits ...
openaire +1 more source
British Journal of Clinical Psychology, EarlyView.Abstract Background Generalized anxiety disorder during the perinatal period (pGAD) is highly prevalent and associated with adverse outcomes for both mother/birthing person (BP) and child. Yet, most treatment studies rely on researcher‐selected outcomes that may not reflect patient priorities.
Emma M. Stallwood +6 more
wiley +1 more source