Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1745l&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1745
Physics
Scientific paper
Comet 103P was observed by our team using Chandra X-ray Observatory (CXO) ACIS-S Xray Imaging Spectroscopy in four separate pointings bracketing the EPOXI fly-by on 17 October 2010, 04 Nov (fly-by), 05 Nov and 16 Nov 2010. The observations were conducted from the Earth-orbiting CXO in the same manner as for our previous comet observations [3, 9, 14-17], with the comet's nucleus near the aim-point in the ACIS S3 chip. No active guiding on the comet was attempted, and CXO was able to follow the comet using multiple pointings. With this method, the comet was centered on the S3 chip and allowed to drift across the FOV until the CXO pointing was updated to re-center the comet before it moved off the chip edge. The ACIS-S CCD array provides high resolution X-ray imaging with a plate scale of 0.5˝ per pixel, an instantaneous field of view 8.3' x 8.3', and moderate resolution spectra (ΔE ˜ 110 eV FWHM, σGaussian ˜ 50 eV) in the 0.3 - 2.5 keV EPSC Abstracts Vol. 6, EPSC-DPS2011-1745, 2011 EPSC-DPS Joint Meeting 2011 c Author(s) 2011 (300 - 2500 eV) energy range. The circumstances of the observations were such that the heliocentric distance rH (~1.07 AU) and elongation angle vs. the Sun (119 ± 5o) were nearly constant; the CXO-comet distance was monotonically increasing from Oct 17 through Nov 16th by almost a factor of 2; and the comet's neutral gas production rate was nearly constant at 9 x 1027 mol/sec except on Nov 4, when it was almost a factor of 50% lower.
Bodewits Dennis
Christian Damian Joseph
Combi Michael R.
Dennerl Konrad
Lepri Susan T.
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