title: Observations of comet 19P/Borrelly by the miniature integrated camera and spectrometer aboard Deep Space 1.
abstract: The nucleus of the Jupiter-family comet 19P/Borrelly was closely observed by the Miniature Integrated Camera and Spectrometer aboard the Deep Space 1 spacecraft on 22 September 2001. The 8-kilometer-long body is highly variegated on a scale of 200 meters, exhibiting large albedo variations (0.01 to 0.03) and complex geologic relationships. Short-wavelength infrared spectra (1.3 to 2.6 micrometers) show a slope toward the red and a hot, dry surface (</=345 kelvin, with no trace of water ice or hydrated minerals), consistent with approximately 10% or less of the surface actively sublimating. Borrelly's coma exhibits two types of dust features: fans and highly collimated jets. At encounter, the near-nucleus coma was dominated by a prominent dust jet that resolved into at least three smaller jets emanating from a broad basin in the middle of the nucleus. Because the major dust jet remained fixed in orientation, it is evidently aligned near the rotation axis of the nucleus.
authors.affiliation: United States Geological Survey, 2255 North Gemini Drive, Flagstaff, AZ 86001, USA. lsoderblom@usgs.gov
authors.forename: L A
authors.initials: LA
authors.lastname: Soderblom
authors.forename: T L
authors.initials: TL
authors.lastname: Becker
authors.forename: G
authors.initials: G
authors.lastname: Bennett
authors.forename: D C
authors.initials: DC
authors.lastname: Boice
authors.forename: D T
authors.initials: DT
authors.lastname: Britt
authors.forename: R H
authors.initials: RH
authors.lastname: Brown
authors.forename: B J
authors.initials: BJ
authors.lastname: Buratti
authors.forename: C
authors.initials: C
authors.lastname: Isbell
authors.forename: B
authors.initials: B
authors.lastname: Giese
authors.forename: T
authors.initials: T
authors.lastname: Hare
authors.forename: M D
authors.initials: MD
authors.lastname: Hicks
authors.forename: E
authors.initials: E
authors.lastname: Howington-Kraus
authors.forename: R L
authors.initials: RL
authors.lastname: Kirk
authors.forename: M
authors.initials: M
authors.lastname: Lee
authors.forename: R M
authors.initials: RM
authors.lastname: Nelson
authors.forename: J
authors.initials: J
authors.lastname: Oberst
authors.forename: T C
authors.initials: TC
authors.lastname: Owen
authors.forename: M D
authors.initials: MD
authors.lastname: Rayman
authors.forename: B R
authors.initials: BR
authors.lastname: Sandel
authors.forename: S A
authors.initials: SA
authors.lastname: Stern
authors.forename: N
authors.initials: N
authors.lastname: Thomas
authors.forename: R V
authors.initials: RV
authors.lastname: Yelle
mesh_terms: D002244:Carbon / Q000032:analysis; D019443:Cosmic Dust; D006838:Hydrocarbons / Q000032:analysis; D019110:Meteoroids; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D019443:Cosmic Dust; D006838:Hydrocarbons; D002244:Carbon