title: Surface compositions across Pluto and Charon.
abstract: The New Horizons spacecraft mapped colors and infrared spectra across the encounter hemispheres of Pluto and Charon. The volatile methane, carbon monoxide, and nitrogen ices that dominate Pluto's surface have complicated spatial distributions resulting from sublimation, condensation, and glacial flow acting over seasonal and geological time scales. Pluto's water ice "bedrock" was also mapped, with isolated outcrops occurring in a variety of settings. Pluto's surface exhibits complex regional color diversity associated with its distinct provinces. Charon's color pattern is simpler, dominated by neutral low latitudes and a reddish northern polar region. Charon's near-infrared spectra reveal highly localized areas with strong ammonia absorption tied to small craters with relatively fresh-appearing impact ejecta.
authors.affiliation: Lowell Observatory, Flagstaff, AZ 86001, USA. w.grundy@lowell.edu.
authors.forename: W M
authors.initials: WM
authors.lastname: Grundy
authors.affiliation: Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: R P
authors.initials: RP
authors.lastname: Binzel
authors.affiliation: NASA Jet Propulsion Laboratory, La Cañada Flintridge, CA 91011, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Buratti
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Cook
authors.affiliation: NASA Ames Research Center, Space Science Division, Moffett Field, CA 94035, USA.
authors.forename: D P
authors.initials: DP
authors.lastname: Cruikshank
authors.affiliation: NASA Ames Research Center, Space Science Division, Moffett Field, CA 94035, USA. Carl Sagan Center, SETI Institute, Mountain View, CA 94043, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Dalle Ore
authors.affiliation: Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Earle
authors.affiliation: NASA Ames Research Center, Space Science Division, Moffett Field, CA 94035, USA.
authors.forename: K
authors.initials: K
authors.lastname: Ennico
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: C J A
authors.initials: CJ
authors.lastname: Howett
authors.affiliation: NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
authors.forename: A W
authors.initials: AW
authors.lastname: Lunsford
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Olkin
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: A H
authors.initials: AH
authors.lastname: Parker
authors.affiliation: Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Philippe
authors.affiliation: Department of Astronomy, University of Maryland, College Park, MD 20742, USA.
authors.forename: S
authors.initials: S
authors.lastname: Protopapa
authors.affiliation: Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Quirico
authors.affiliation: NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
authors.forename: D C
authors.initials: DC
authors.lastname: Reuter
authors.affiliation: Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France.
authors.forename: B
authors.initials: B
authors.lastname: Schmitt
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: K N
authors.initials: KN
authors.lastname: Singer
authors.affiliation: Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA.
authors.forename: A J
authors.initials: AJ
authors.lastname: Verbiscer
authors.affiliation: NASA Ames Research Center, Space Science Division, Moffett Field, CA 94035, USA. Carl Sagan Center, SETI Institute, Mountain View, CA 94043, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Beyer
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: M W
authors.initials: MW
authors.lastname: Buie
authors.affiliation: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.
authors.forename: A F
authors.initials: AF
authors.lastname: Cheng
authors.affiliation: NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
authors.forename: D E
authors.initials: DE
authors.lastname: Jennings
authors.affiliation: Stanford University, Stanford, CA 94305, USA.
authors.forename: I R
authors.initials: IR
authors.lastname: Linscott
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: J Wm
authors.initials: JW
authors.lastname: Parker
authors.affiliation: Lunar and Planetary Institute, Houston, TX 77058, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Schenk
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Spencer
authors.affiliation: Space Telescope Science Institute, Baltimore, MD, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Stansberry
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Stern
authors.affiliation: Planetary Science Institute, Mumbai, India.
authors.forename: H B
authors.initials: HB
authors.lastname: Throop
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: C C C
authors.initials: CC
authors.lastname: Tsang
authors.affiliation: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Weaver
authors.affiliation: Southwest Research Institute, San Antonio, TX 28510, USA.
authors.forename: G E
authors.initials: GE
authors.lastname: Weigle
authors.affiliation: Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Young