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Subsurface properties and early activity of comet 67P/Churyumov-Gerasimenko.

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Title: Subsurface properties and early activity of comet 67P/Churyumov-Gerasimenko.
Authors: Gulkis, Samuel, Allen, Mark, von Allmen, Paul, Beaudin, Gerard, Biver, Nicolas, Bockelée-Morvan, Dominique, Choukroun, Mathieu, Crovisier, Jacques, Davidsson, Björn J. R., Encrenaz, Pierre, Encrenaz, Therese, Frerking, Margaret, Hartogh, Paul, Hofstadter, Mark, Wing-Huen Ip, Janssen, Michael, Jarchow, Christopher, Keihm, Stephen, Seungwon Lee, Lellouch, Emmanuel
Source: Science (pre-March 2025). 1/23/2015, Vol. 347 Issue 6220, p709-1-709-5. 5p.
Subjects: Churyumov-Gerasimenko comet, Surface temperature, Water spectra, Water vapor, Rotational motion, Outgassing, Rosetta (Spacecraft), Astrogeology
Abstract: Heat transport and ice sublimation in comets are interrelated processes reflecting properties acquired at the time of formation and during subsequent evolution. The Microwave Instrument on the Rosetta Orbiter (MIRO) acquired maps of the subsurface temperature of comet 67P/Churyumov-Gerasimenko, at 1.6 mm and 0.5 mm wavelengths, and spectra of water vapor. The total H2O production rate varied from 0.3 kg s-1 in early June 2014 to 1.2 kg s-1 in late August and showed periodic variations related to nucleus rotation and shape. Water outgassing was localized to the "neck" region of the comet. Subsurface temperatures showed seasonal and diurnal variations, which indicated that the submillimeter radiation originated at depths comparable to the diurnal thermal skin depth. A low thermal inertia (~10 to 50 J K-1 m-2 s-0.5 ), consistent with a thermally insulating powdered surface, is inferred. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Subsurface properties and early activity of comet 67P/Churyumov-Gerasimenko.
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  Data: <searchLink fieldCode="AR" term="%22Gulkis%2C+Samuel%22">Gulkis, Samuel</searchLink><br /><searchLink fieldCode="AR" term="%22Allen%2C+Mark%22">Allen, Mark</searchLink><br /><searchLink fieldCode="AR" term="%22von+Allmen%2C+Paul%22">von Allmen, Paul</searchLink><br /><searchLink fieldCode="AR" term="%22Beaudin%2C+Gerard%22">Beaudin, Gerard</searchLink><br /><searchLink fieldCode="AR" term="%22Biver%2C+Nicolas%22">Biver, Nicolas</searchLink><br /><searchLink fieldCode="AR" term="%22Bockelée-Morvan%2C+Dominique%22">Bockelée-Morvan, Dominique</searchLink><br /><searchLink fieldCode="AR" term="%22Choukroun%2C+Mathieu%22">Choukroun, Mathieu</searchLink><br /><searchLink fieldCode="AR" term="%22Crovisier%2C+Jacques%22">Crovisier, Jacques</searchLink><br /><searchLink fieldCode="AR" term="%22Davidsson%2C+Björn+J%2E+R%2E%22">Davidsson, Björn J. R.</searchLink><br /><searchLink fieldCode="AR" term="%22Encrenaz%2C+Pierre%22">Encrenaz, Pierre</searchLink><br /><searchLink fieldCode="AR" term="%22Encrenaz%2C+Therese%22">Encrenaz, Therese</searchLink><br /><searchLink fieldCode="AR" term="%22Frerking%2C+Margaret%22">Frerking, Margaret</searchLink><br /><searchLink fieldCode="AR" term="%22Hartogh%2C+Paul%22">Hartogh, Paul</searchLink><br /><searchLink fieldCode="AR" term="%22Hofstadter%2C+Mark%22">Hofstadter, Mark</searchLink><br /><searchLink fieldCode="AR" term="%22Wing-Huen+Ip%22">Wing-Huen Ip</searchLink><br /><searchLink fieldCode="AR" term="%22Janssen%2C+Michael%22">Janssen, Michael</searchLink><br /><searchLink fieldCode="AR" term="%22Jarchow%2C+Christopher%22">Jarchow, Christopher</searchLink><br /><searchLink fieldCode="AR" term="%22Keihm%2C+Stephen%22">Keihm, Stephen</searchLink><br /><searchLink fieldCode="AR" term="%22Seungwon+Lee%22">Seungwon Lee</searchLink><br /><searchLink fieldCode="AR" term="%22Lellouch%2C+Emmanuel%22">Lellouch, Emmanuel</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 1/23/2015, Vol. 347 Issue 6220, p709-1-709-5. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Churyumov-Gerasimenko+comet%22">Churyumov-Gerasimenko comet</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+temperature%22">Surface temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Water+spectra%22">Water spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Water+vapor%22">Water vapor</searchLink><br /><searchLink fieldCode="DE" term="%22Rotational+motion%22">Rotational motion</searchLink><br /><searchLink fieldCode="DE" term="%22Outgassing%22">Outgassing</searchLink><br /><searchLink fieldCode="DE" term="%22Rosetta+%28Spacecraft%29%22">Rosetta (Spacecraft)</searchLink><br /><searchLink fieldCode="DE" term="%22Astrogeology%22">Astrogeology</searchLink>
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  Label: Abstract
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  Data: Heat transport and ice sublimation in comets are interrelated processes reflecting properties acquired at the time of formation and during subsequent evolution. The Microwave Instrument on the Rosetta Orbiter (MIRO) acquired maps of the subsurface temperature of comet 67P/Churyumov-Gerasimenko, at 1.6 mm and 0.5 mm wavelengths, and spectra of water vapor. The total H2O production rate varied from 0.3 kg s-1 in early June 2014 to 1.2 kg s-1 in late August and showed periodic variations related to nucleus rotation and shape. Water outgassing was localized to the "neck" region of the comet. Subsurface temperatures showed seasonal and diurnal variations, which indicated that the submillimeter radiation originated at depths comparable to the diurnal thermal skin depth. A low thermal inertia (~10 to 50 J K-1 m-2 s-0.5 ), consistent with a thermally insulating powdered surface, is inferred. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=100585227
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        Value: 10.1126/science.aaa0709
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