Satellite, asteroid and comet photographic positions
نویسندگان
چکیده
منابع مشابه
Comet and Asteroid Hazard to the Terrestrial Planets
We estimated the rate of comet and asteroid collisions with the terrestrial planets by calculating the orbits of 13000 Jupiter-crossing objects (JCOs) and 1300 resonant asteroids and computing the probabilities of collisions based on random-phase approximations and the orbital elements sampled with a 500 yr step. The Bulirsh-Stoer and a symplectic orbit integrator gave similar results for orbit...
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In the last few years it has been pointed out that, from both physical and dynamical point of view, it is becoming more and more difficult to distinguish comets from asteroids and indeed there are some examples of small bodies first designated as comets which had, later, to be reclassified as asteroids and vice versa (Hartmann et al., 1990; McFadden, 1994). In order to investigate the evolution...
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We observed comet 322P/SOHO 1 (P/1999 R1) from the ground and with the Spitzer Space Telescope when it was between 2.2 and 1.2 AU from the Sun. These are the first observations of any SOHO-discovered periodic comet by a non-solar observatory, and allow us to investigate its behavior under typical cometary circumstances. 322P appeared inactive in all images. Its lightcurve suggests a rotation pe...
متن کاملThe Comet/asteroid Impact Hazard: a Systems Approach
The threat of impact on Earth of an asteroid or comet, while of very low probability, has the potential to create public panic and – should an impact happen – be sufficiently destructive (perhaps on a global scale) that an integrated approach to the science, technology, and public policy aspects of the impact hazard is warranted. This report outlines the breadth of the issues that need to be ad...
متن کاملRadio reflection imaging of asteroid and comet interiors I: Acquisition and imaging theory
Imaging the interior structure of comets and asteroids can provide insight into their formation in the early Solar System, and can aid in their exploration and hazard mitigation. Accurate imaging can be accomplished using broadband wavefield data penetrating deep inside the object under investigation. This can be done in principle using seismic systems (which is difficult since it requires cont...
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ژورنال
عنوان ژورنال: Lick Observatory Bulletins
سال: 1915
ISSN: 0075-9317
DOI: 10.5479/ads/bib/1915licob.8.141h