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Three Peaks of 2011 Draconid Activity Including that Connected with Pre-1900 Material
The moon - Tập 112 - Trang 15-31 - 2014
A Draconid meteor shower outburst was observed from on board two scientific aircraft deployed above Northern Europe on 8th October 2011. The activity profile was measured using a set of photographic and video cameras. The main peak of the activity occurred around 20:15 ± 0:0.5 UT which is consistent with the model prediction as well as with the IMO network visual observations. The corrected hourly...... hiện toàn bộ
Expansion of the planetary Hamiltonian function
The moon - Tập 62 - Trang 3-45 - 1993
We expand the planetary Hamiltonian function with its two parts, the principal and the indirect, up to the seventh order in the planetary masses. We adopt the Jacobi-Radau system of origins. The expansiion is valid for any number of planets.
The absence of large-scale volcanic crater subsidence in Ishtar Terra on Venus
The moon - - 1989
The absence of large-scale subsidence features around the three volcanic craters in Ishtar Terra on Venus implies the continued presence of underlying magma and the possibility of current volcanic activity there.
Coincidental Compositional and Orbital Correspondences Among Some Ordinary Chondrites: No Strong Evidence for Meteoroid Streams
The moon - Tập 103 - Trang 73-88 - 2008
Previous attempts to assign ordinary chondrites (OC) to meteoroid streams have been unsuccessful because the orbits of the proposed members had different radiants and, in some cases, the meteorites had significantly different cosmic-ray exposure (CRE) ages. Using more conservative criteria, we have identified four pairs of equilibrated OC (L6 Nejo, Salem; L6 Perpeti, Vouillé; L6 Drake Creek, Forsy...... hiện toàn bộ
Algorithms for Stellar Perturbation Computations on Oort Cloud Comets
The moon - Tập 97 - Trang 411-434 - 2006
We investigate different approximate methods of computing the perturbations on the orbits of Oort cloud comets caused by passing stars, by checking them against an accurate numerical integration using Everhart’s RA15 code. The scenario under study is the one relevant for long-term simulations of the cloud’s response to a predefined set of stellar passages. Our sample of stellar encounters simulate...... hiện toàn bộ
Visible Lightcurve Observations of Comet 19p/Borrelly
The moon - Tập 90 - Trang 463-471 - 2002
The final Deep Space 1 (DS1) mission target, comet 19P/Borrelly, was observedfrom July 28–August 1, 2000 at the CTIO-1.5 m telescope in the R filter. Theobserved lightcurve has a large peak to peak variation between 0.84 mag and1.0 mag. A period of 26.0 ± 1 hr (assuming a double-peaked lightcurve)was found using all five nights. This is in good agreement with the period of25.02 ± 0.5 hr quoted by ...... hiện toàn bộ
Hydrogen and Helium under high pressure: A case for a classical theory of dense matter
The moon - Tập 45 - Trang 291-298 - 1989
When subject to high pressure, H2 and 3He are expected to undergo phase transitions, and to become metallic at a sufficiently high pressure. Using a semiclassical theory of dense matter proposed by Savić and Kašanin, calculations of phase transition and metallisation pressure have been performed for these two materials. In hydrogen, metallisation occurs at p
M= (3.0 ± 0.2) Mbar, while for helium t...... hiện toàn bộ
Electromagnetic Ion Cyclotron Waves in Multi-Ions Hot Anisotropic Plasma in Auroral Acceleration Region-Particle Aspect Approach
The moon - Tập 109 - Trang 29-41 - 2012
Using particle aspect approach, the effect of multi-ions densities on the dispersion relation, growth rate, perpendicular resonant energy and growth length of electromagnetic ion cyclotron wave with general loss-cone distribution function in hot anisotropic multi-ion plasma is presented for auroral acceleration region. It is observed that higher He+ and O+ ions densities enhance the wave frequency...... hiện toàn bộ
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