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dc.contributor.authorSpringmann, A.
dc.contributor.authorHarris, W.M.
dc.contributor.authorRyan, E.L.
dc.contributor.authorLejoly, C.
dc.contributor.authorHowell, E.S.
dc.contributor.authorMueller, B.E.A.
dc.contributor.authorSamarasinha, N.H.
dc.contributor.authorWoodney, L.M.
dc.contributor.authorSteckloff, J.K.
dc.date.accessioned2022-03-17T01:57:21Z
dc.date.available2022-03-17T01:57:21Z
dc.date.issued2022
dc.identifier.citationSpringmann, A., Harris, W. M., Ryan, E. L., Lejoly, C., Howell, E. S., Mueller, B. E. A., Samarasinha, N. H., Woodney, L. M., & Steckloff, J. K. (2022). Repeating Gas Ejection Events from Comet 45P/Honda–Mrkos–Pajdušáková. Planetary Science Journal.
dc.identifier.issn2632-3338
dc.identifier.doi10.3847/PSJ/ac3e66
dc.identifier.urihttp://hdl.handle.net/10150/663618
dc.description.abstractStudying materials released from Jupiter-family comets (JFCs)—as seen in their inner comae, the envelope of gas and dust that forms as the comet approaches the Sun—improves the understanding of their origin and evolutionary history. As part of a coordinated, multiwavelength observing campaign, we observed comet 45P/Honda–Mrkos–Pajdušáková during its close approach to Earth in 2017 February. Narrowband observations were taken using the Bok 90″ telescope at Kitt Peak National Observatory on February 16 and 17 UT, revealing gas and dust structures. We observed different jet directions for different volatile species, implying source region heterogeneity, consistent with other ground-based and in situ observations of other comet nuclei. A repeating feature visible in CN and C2 images on February 16 was also observed on February 17 with an interval of 7.6 ± 0.1 hr, consistent with the rotation period of the comet derived from Arecibo Observatory radar observations. The repeating feature’s projected gas velocity away from the nucleus is 0.8 km s−1, with an outflow velocity of 0.5 km s−1. A bright compact spot adjacent to the nucleus provides a lower limit of the amount of material released in one cycle of ∼9.2 kg, depending on composition—a quantity small enough to be produced by repeated exposure of nucleus ices to sunlight. This repeating CN jet, forming within 400 km of the nucleus, may be typical of inner-coma behavior in JFCs; however, similar features could be obscured by other processes and daughter product species when viewed from distances further than the scale length of CN molecules. © 2022. The Author(s). Published by the American Astronomical Society.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.rightsCopyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleRepeating Gas Ejection Events from Comet 45P/Honda–Mrkos–Pajdušáková
dc.typeArticle
dc.typetext
dc.contributor.departmentLunar and Planetary Laboratory, University of Arizona
dc.identifier.journalPlanetary Science Journal
dc.description.noteOpen access journal
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitlePlanetary Science Journal
refterms.dateFOA2022-03-17T01:57:21Z


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Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Except where otherwise noted, this item's license is described as Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.