Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p33d..06v&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P33D-06
Other
5464 Remote Sensing, 5470 Surface Materials And Properties, 6280 Saturnian Satellites, 6290 Uranian Satellites
Scientific paper
The Spitzer Space Telescope, formerly known as SIRTF, is now operational and delivers unprecedented sensitivity for the observation of Solar System targets. Spitzer has three instruments, IRAC, IRS, and MIPS. IRAC (InfraRed Array Camera) provides simultaneous images at wavelengths of 3.6, 4.5, 5.8, and 8.0 μ m. IRS (InfraRed Spectrograph) has 4 modules providing low-resolution (R=60-120) spectra from 5.3 to 40 μ m, high-resolution (R=600) spectra from 10 to 37 μ m, and an autonomous target acquisition system (PeakUp) which includes small-field imaging at 15 μ m. MIPS (Multiband Imaging Photometer for SIRTF) does imaging photometry at 24, 70, and 160 μ m and low-resolution (R=15-25) spectroscopy (SED) between 55 and 96 μ m. Guaranteed Time Observer (GTO) programs include the moons of the outer Solar System, Pluto, Centaurs, Kuiper Belt Objects, and comets. For example, the "IRS Moons and Planets" program is now examining the principal satellites of outer Solar System planets, as well as Uranus and Neptune, using all SIRTF instruments. IRAC photometry will establish the hitherto unknown albedo of these cold objects at wavelengths between 3.5 and 8 μ m, IRS will do reflectance spectrosopy at wavelengths between 5.3 and 15 μ m, and thermal emission spectroscopy between 10 and 40 μ m. Combined with MIPS photometry and SED measurements, these data will provide compositional information, albedo, and thermal properties of these objects. The observations of Uranus and Neptune will be used to monitor changes in Uranus and Neptune atmospheres with season [1,2], for trace composition data, and for precise straylight subtraction for observations of their innermost principal satellites. We will observe Titan to compare spectra of the hemisphere centered on the "continent" seen in near-IR Hubble images [3] to spectra of other Titan longitudes, and interpret these differences in terms of surface composition and temperature. The poster will represent the first Solar System results of SIRTF, including but not limited to: 1. Photometry of the principal Uranian satellites between 3.6 and 15 μ m and interpretation in terms of surface composition, temperature, and thermal inertia. 2. Images and spectra of Phoebe and Rhea, and such other moons of Saturn as are scheduled for observation between March 1 and the beginning of this conference. 3. Images and spectra of Neptune and Triton, if those observations are scheduled between April 29 and the beginning of this conference. References: [1] Hammel H. B., Young, L. A, Hackwell J., Lynch D. K., Russell R., and Orton G. S. (1992) Icarus, 99, 347. [2] Hammel, H. B., Rages K., Lockwood G. W., Karkoschka E., and de Pater I. (2001) Icarus, 153, 229. [3] Smith, P. H., Lemmon, M. T., Lorenz, R. D., Sromovsky, L. A., Caldwell, J. J., and Allison, M. D. (1996) Icarus, 119, 336.
Burgdorf Martin J.
Cruikshank Dale P.
Devost Daniel
Emery Joshua P.
Fazio Giacomo
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