The Volatile Composition and Activity of Comet 103P/Hartley 2 During the EPOXI Closest Approach

dc.contributor.utaustinauthorCochran, Anita L.en_US
dc.creatorDello Russo, N.en_US
dc.creatorVervack, R. J.en_US
dc.creatorLisse, C. M.en_US
dc.creatorWeaver, H. A.en_US
dc.creatorKawakita, H.en_US
dc.creatorKobayashi, H.en_US
dc.creatorCochran, Anita L.en_US
dc.creatorHarris, W. M.en_US
dc.creatorMcKay, A. J.en_US
dc.creatorBiver, N.en_US
dc.creatorBockelee-Morvan, D.en_US
dc.creatorCrovisier, J.en_US
dc.date.accessioned2016-10-28T19:37:02Z
dc.date.available2016-10-28T19:37:02Z
dc.date.issued2011-06en_US
dc.description.abstractWe report time-resolved measurements of the absolute and relative abundances of eight parent volatiles (H2O, CH3OH, C2H6, C2H2, NH3, HCN, H2CO, and HC3N) in the coma of 103P/Hartley 2 on UT 2010 November 4, the date the EPOXI spacecraft made its closest approach to the comet, using high-dispersion infrared spectroscopy with NIRSPEC at the W. M. Keck Observatory. Overall gas and dust production increased by roughly 60% between UT 10:49 and 15:54. Differences in the spatial distributions of species in the coma suggest icy sources of different composition in the nucleus of 103P/Hartley 2. However, differences in the relative abundances of species with time are minor, suggesting either internal compositional heterogeneity in 103P/Hartley 2 is small compared with the diversity of chemistry observed within the comet population, or more significant heterogeneity exists on scales smaller than our spatial resolution. Observations contemporaneous with the EPOXI encounter test how compositional heterogeneity over the surface and the inner coma of a comet manifests itself in remote-sensing observations of the bulk coma.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipW. M. Keck Foundationen_US
dc.description.sponsorshipNASAen_US
dc.identifierdoi:10.15781/T2TB0XZ0P
dc.identifier.citationRusso, N. Dello, R. J. Vervack Jr, C. M. Lisse, H. A. Weaver, H. Kawakita, H. Kobayashi, A. L. Cochran et al. "THE VOLATILE COMPOSITION AND ACTIVITY OF COMET 103P/HARTLEY 2 DURING THE EPOXI CLOSEST APPROACH Based on observations obtained at the WM Keck Observatory, Mauna Kea, HI, USA." The Astrophysical Journal Letters, Vol. 734, No. 1 (Jun., 2011): L8.en_US
dc.identifier.doi10.1088/2041-8205/734/1/l8en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43046
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectastrochemistryen_US
dc.subjectcomets: generalen_US
dc.subjectcomets: individual (103p/hartley 2)en_US
dc.subjectinfrared: generalen_US
dc.subjectmolecular dataen_US
dc.subjecttechniques: spectroscopicen_US
dc.subjectjupiter-family cometsen_US
dc.subjectc/1999 h1 leeen_US
dc.subjecto1 hale-boppen_US
dc.subjectinfrareden_US
dc.subjectwavelengthsen_US
dc.subjectwater productionen_US
dc.subjectintensitiesen_US
dc.subjectbanden_US
dc.subjectformaldehydeen_US
dc.subjecttelescopeen_US
dc.subjectemissionen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Volatile Composition and Activity of Comet 103P/Hartley 2 During the EPOXI Closest Approachen_US
dc.typeArticleen_US

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