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Survey of cometary CO2, CO, and particulate emissions using the Spitzer Space Telescope
Reach, William T.; Kelley, Michael S.; Vaubaillon, Jeremie
We surveyed 23 comets using the Infrared Array Camera on the Spitzer Space Telescope in wide filters centered at 3.6 and 4.5 µm. Emission in the 3.6 µm filter arises from sunlight scattered by dust grains; the 3.6 µm images generally have a coma near the nucleus and a tail in the antisolar direction due to dust grains swept back …
Evidence for two modes of water release in Comet 103P/Hartley 2: Distributions of column density, rotational temperature, and ortho-para ratio
Villanueva, Geronimo L.; Mumma, Michael J.; Meech, Karen J. +5 more
This paper presents long-slit spectra of H2O emission from the inner coma of Comet 103P/Hartley 2, acquired with NIRSPEC/Keck 2 during the comet's close approach to Earth in 2010. On UT 19.6 October 2010 the slit was oriented nearly orthogonal to the projected (in the plane of the sky) Sun-comet line, and the H2O rotational t…
Reconciling main belt asteroid spectral flux density measurements with a self-consistent thermophysical model
Choukroun, Mathieu; Janssen, Michael; Keihm, Stephen +4 more
Thermophysical models consistent with Earth’s Moon and infrared and submillimeter measurements obtained during the Rosetta fly-by of Asteroid (21) Lutetia have been applied to computations of thermal fluxes from Asteroids (4) Vesta, (1) Ceres, (2) Pallas, and (10) Hygiea. Comparisons are made with Earth- and space-based flux measurements that cove…