Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.0503g&link_type=abstract
American Astronomical Society, DPS meeting #40, #5.03; Bulletin of the American Astronomical Society, Vol. 40, p.393
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We observed comet 8P/Tuttle, a nearly isotropic comet (NIC), with the IRS and MIPS instruments of the Spitzer Space Telescope (SST). The IRS observations were performed on 2 November 2007 when the comet was at 1.32 AU from SST, 1.61 AU from the Sun, and nearly 3 months before perihelion on 27 January 2008 when its heliocentric distance was 1 AU. We used IRS in low-resolution mode to obtain the spectral energy distribution (SED) from 5 to 35 micron. The MIPS observations were performed on 22 June 2008 when the comet was at 1.58 AU from SST and 2.24 AU from the Sun. We sampled a period of 15 hours with 20 MIPS images at 24 µm, and also acquired 4 MIPS images at 70 µm to better constrain the SED. From these IRS and MIPS observations, we derived the size and thermal inertia of the nucleus of comet 8P/Tuttle. The (010-000) vibrational emission band of water at 6.3 microns was also detected, and we derived the water production rate and active surface fraction.
Fernandez Yanga
Groussin Olivier
Jorda Laurent
Kelley Michael
Lamy Philippe
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