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  Hubble Space Telescope Observations of 3200 Phaethon at Closest Approach

Jewitt, D., Mutchler, M., Agarwal, J., & Li, J. (2018). Hubble Space Telescope Observations of 3200 Phaethon at Closest Approach. The Astronomical Journal, 156(5): 238. doi:10.3847/2041-8213/aaee10.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-A2D8-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-06F7-C
Genre: Journal Article

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 Creators:
Jewitt, David, Author
Mutchler, Max, Author
Agarwal, Jessica1, Author              
Li, Jing, Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: comets: general; meteorites, meteors, meteoroids; minor planets, asteroids: general
 MPIS_PROJECTS: Ground-based Obs.
 Abstract: We present Hubble Space Telescope observations of the active asteroid (and Geminid stream parent) 3200 Phaethon when at its closest approach to Earth (separation 0.07 au) in 2017 December. Images were recorded within ~1° of the orbital plane, providing extra sensitivity to low surface brightness caused by scattering from a large-particle trail. We placed an upper limit on the apparent surface brightness of such a trail at 27.2 mag arcsecond−2, corresponding to an in-plane optical depth ≤3 × 10−9. No co-moving sources brighter than absolute magnitude 26.3, corresponding to circular equivalent radius ~12 m (albedo 0.12 assumed), were detected. Phaethon is too hot for near-surface ice to survive. We briefly consider the thermodynamic stability of deeply buried ice, finding that its survival would require either a very small (regolith-like) thermal diffusivity (<10−8 m2 s−1), or the unexpectedly recent injection of Phaethon (timescale lesssim106 years) into its present orbit, or both.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/aaee10
 Degree: -

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Title: The Astronomical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 156 (5) Sequence Number: 238 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_4