Results 11 to 20 of about 6,770 (188)
Solar Wind Protons Forming Partial Ring Distributions at Comet 67P
Journal of Geophysical Research: Space Physics, Volume 128, Issue 2, February 2023., 2023 Abstract We present partial ring distributions of solar wind protons observed by the Rosetta spacecraft at comet 67P/Churyumov‐Gerasimenko. The formation of ring distributions is usually associated with high activity comets, where the spatial scales are larger than multiple ion gyroradii.
A. Moeslinger +7 more
wiley +1 more source
Observations of a Solar Energetic Particle Event From Inside and Outside the Coma of Comet 67P
Journal of Geophysical Research: Space Physics, Volume 127, Issue 12, December 2022., 2022 Abstract We analyze observations of a solar energetic particle (SEP) event at Rosetta's target comet 67P/Churyumov‐Gerasimenko during 6–10 March 2015. The comet was 2.15 AU from the Sun, with the Rosetta spacecraft approximately 70 km from the nucleus placing it deep inside the comet's coma and allowing us to study its response. The Eastern flank of an
A. Wellbrock +14 more
wiley +1 more source
Вісник Астрономічної школи, 2018 Asteroids and cometary nuclei consist of the same primary substance as the gas-dust cloud from which the solar system was formed. Now this substance is being studied in the meteorite material that fell to the Earth's surface. NASA experts suggested after
A. P. Vidmachenko, A. F. Steklov
doaj +1 more source
The unusual volatile composition of the Halley-type comet 8P/Tuttle: Addressing the existence of an Inner Oort Cloud [PDF]
Astrophys.J.683:L71-L74,2008, 2008 We measured organic volatiles (CH4, CH3OH, C2H6, H2CO), CO, and water in comet 8P/Tuttle, a comet from the Oort cloud reservoir now in a short-period Halley-type orbit. We compare its composition with two other comets in Halley-type orbits, and with comets of the "organics-normal" and "organics-depleted" classes.
arxiv +1 more source
Halley's comet of 87 BC on the coins of Armenian king Tigranes? [PDF]
Astronomy & Geophysics 45 (4, August), p.4.06, 2004, 2004 Coins of Armenian king Tigranes II the Great (95-55 BC), silver and copper-bronze tetradrachms and drachms, clearly reveal a star with a tail on the royal tiara which may be associated with the Halley's comet passage of 87 BC. If so, one has another case when astronomical events can be useful for historical chronological problems, this would be a far ...
arxiv +1 more source
Tähistaeval põhinevatest uskumustest III Vana-Hiina [PDF]
Mäetagused, 2002 The article concerns Chinese astral myths, calendar and astrology. Chinese creation myths concern also the creation of the Sun, Moon and stars. The heavenly bodies are constantly endangered by the sky dragon that now and then catches them, probably a ...
Enn Kasak
doaj
Shocklets in the Comet Halley Plasma [PDF]
, 2020 Dust acoustic (DA) waves evolving into shocklets are investigated in the Comet Halley plasma system relaxing to Maxwellian, Kappa and Cairns distributions. Here dynamics of dust is described by the fully nonlinear continuity and momentum equations. A set of two characteristic wave nonlinear equations is obtained and numerically solved to examine the DA
arxiv +1 more source
A model for the common origin of Jupiter family and Halley type comets [PDF]
Earth, Moon, and Planets, 2013, Volume 110, Issue 1-2, pp. 105-130, 2014 A numerical simulation of the Oort cloud is used to explain the observed orbital distributions and numbers of Jupiter-family and Halley-type short-period comets. Comets are given initial orbits with perihelion distances between 5 and 36 AU, and evolve under planetary, stellar and Galactic perturbations for 4.5 Gyr.
arxiv +1 more source
Collision probabilities of migrating small bodies and dust particles with planets [PDF]
IAU Symp.263:41-44,2010, 2009 Probabilities of collisions of migrating small bodies and dust particles produced by these bodies with planets were studied. Various Jupiter-family comets, Halley-type comets, long-period comets, trans-Neptunian objects, and asteroids were considered. The total probability of collisions of any considered body or particle with all planets did not exceed
arxiv +1 more source
The end states of long-period comets and the origin of Halley-type comets [PDF]
Monthly Notices of the Royal Astronomical Society, 2016, 2016 We analyze a sample of 73 old long-period comets (LPCs) (orbital periods $200 < P < 1000$ yr) with perihelion distances $q < 2.5$ au, discovered in the period 1850-2014. We cloned the observed comets and also added fictitious LPCs with perihelia in the Jupiter's zone.
arxiv +1 more source