منابع مشابه
Deep Impact : Excavating Comet Tempel
Introduction: On 4 July 2005, Deep Impact delivered 19 GJoules of kinetic energy to the nucleus of comet Tempel 1, taking numerous images and spectra of the comet before, during, and after the impact. The preliminary analysis of the data has already lead to significant, new understanding of cometary properties and behavior [1] and this talk will summarize the present state of our understanding ...
متن کاملDeep Impact: excavating comet Tempel 1.
Deep Impact collided with comet Tempel 1, excavating a crater controlled by gravity. The comet's outer layer is composed of 1- to 100-micrometer fine particles with negligible strength (<65 pascals). Local gravitational field and average nucleus density (600 kilograms per cubic meter) are estimated from ejecta fallback. Initial ejecta were hot (>1000 kelvins). A large increase in organic materi...
متن کاملA ' Hearn , Deep Impact : Excavating Comet Tempel
http://www.sciencemag.org/cgi/content/full/310/5746/258 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/1118923/DC1 can be found at: Supporting Online Material found at: can be related to this article A list of selected additional articles on the Science Web sites http://www.sc...
متن کاملThe Coma of Comet 9p/tempel 1
As comet 9P/Tempel 1 approaches the Sun in 2004–2005, a temporary atmosphere, or “coma,” will form, composed of molecules and dust expelled from the nucleus as its component icy volatiles sublimate. Driven mainly by water ice sublimation at surface temperatures T > 200 K, this coma is a gravitationally unbound atmosphere in free adiabatic expansion. Near the nucleus (≤102 km), it is in collisio...
متن کاملTemperature of the Nucleus of Comet Tempel
Introduction: The Deep Impact spacecraft (DI) encountered comet 9P/Tempel 1 on July 4, 2005 and observed it with several instruments. In particular, we obtained infrared spectra of the nucleus with the HRI-IR spectrometer in the wavelength range of 15μm. From these spectra, we derived the first temperature map of a comet nucleus. The data were taken before impact, with a maximum resolution of ~...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1879
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18790940605