Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.6208b&link_type=abstract
American Astronomical Society, DPS meeting #39, #62.08; Bulletin of the American Astronomical Society, Vol. 39, p.542
Other
1
Scientific paper
We will report on continued observations of the Pluto system obtained with the Hubble Space Telescope in Cycle 15 (2006 July to 2007 June). These observations were originally intended to be carried out with the ACS/HRC instrument that was used to discover and determine the initial orbits of Nix and Hydra. This instrument suffered a critical component failure in January 2007 and our observing program had to be re-written to use the WFPC2 camera system. A total of 19 visits were executed between 2007 Mar 24 and 2007 Jun 01. 14 visits using the F555W filter (V equivalent) were organized to provide the broadest possible constraints on rotation periods. The additional 5 visits were used to collect a wide wavelength range of broad band photometry using the F439W, F675W, and F814W filters with WFPC2 and the F110W and F160W filters with NICMOS. Full analysis of these data are not possible without quality supporting orbits. The satellites are found to be within a WFPC2/PC pixel (0.046 arcsec) of our current best-fit orbits that are based on the older HST/ACS data. We will present results to date on astrometry, orbital properties, lightcurves, phase coefficients, mean brightness, and broadband colors of Nix and Hydra. Additionally we will comment on the other uses for this dataset in continued studies of Pluto and Charon. This work is supported by grants from the Space Telescope Science Institute.
Buie Marc William
Grundy Will M.
Tholen David J.
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