Dust Grains from 9P/Tempel 1 Before and After the Encounter with Deep Impact

Gemini-N observed the properties of dust ejected from the nucleus of comet 9P/Tempel 1 before and after its encounter with Deep Impact. Marked changes were seen in the 7.8- to 13-micrometer spectral energy distribution and derived grain properties of the inner coma. A strong, broad silicate feature...

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Published in:Science (American Association for the Advancement of Science) 2005-10, Vol.310 (5746), p.278-280
Main Authors: Harker, David E, Woodward, Charles E, Wooden, Diane H
Format: Article
Language:English
Subjects:
Analysis
Astronomical research
Astrophysics
Climate
Cometary comas
Comets
Cosmic Dust
Electronic publishing
Meteoroids
Natural history
Observational astronomy
Observational research
Olivine
Organic Chemicals - analysis
Particle resonance
Pyroxenes
Silicates
Spectrophotometry, Infrared
Spectrum analysis
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description Gemini-N observed the properties of dust ejected from the nucleus of comet 9P/Tempel 1 before and after its encounter with Deep Impact. Marked changes were seen in the 7.8- to 13-micrometer spectral energy distribution and derived grain properties of the inner coma. A strong, broad silicate feature dominated by emission from amorphous pyroxene, amorphous olivine, and magnesium-rich crystalline olivine had developed by 1 hour after impact. The ejected dust mass is [congruent]10⁴ to 10⁶ kilograms on the basis of our models. Twenty-six hours later the silicate feature had faded, leaving a smooth featureless spectrum, similar to that observed before the impact, suggesting that the impact did not produce a new active region releasing small particles on the nucleus.
doi_str_mv 10.1126/science.1119143
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source American Association for the Advancement of Science; Social Science Premium Collection; JSTOR-E-Journals; Alma/SFX Local Collection; Education Collection
subjects Analysis
Astronomical research
Astrophysics
Climate
Cometary comas
Comets
Cosmic Dust
Electronic publishing
Meteoroids
Natural history
Observational astronomy
Observational research
Olivine
Organic Chemicals - analysis
Particle resonance
Pyroxenes
Silicates
Spectrophotometry, Infrared
Spectrum analysis
title Dust Grains from 9P/Tempel 1 Before and After the Encounter with Deep Impact
url http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-02T06%3A05%3A12IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_proqu&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Dust%20Grains%20from%209P/Tempel%201%20Before%20and%20After%20the%20Encounter%20with%20Deep%20Impact&rft.jtitle=Science%20(American%20Association%20for%20the%20Advancement%20of%20Science)&rft.au=Harker,%20David%20E&rft.date=2005-10-14&rft.volume=310&rft.issue=5746&rft.spage=278&rft.epage=280&rft.pages=278-280&rft.issn=0036-8075&rft.eissn=1095-9203&rft.coden=SCIEAS&rft_id=info:doi/10.1126/science.1119143&rft_dat=%3Cgale_proqu%3EA138011299%3C/gale_proqu%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-a764t-6e5fe2e661fdaa0e3c67d70095cc24c7ecf67db7870cd24fa6e658eeac6cbe13%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_pqid=213614504&rft_id=info:pmid/16166478&rft_galeid=A138011299&rft_jstor_id=3842650&rfr_iscdi=true