Physics – Optics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.6202s&link_type=abstract
American Astronomical Society, DPS meeting #39, #62.02; Bulletin of the American Astronomical Society, Vol. 39, p.540
Physics
Optics
1
Scientific paper
Stellar occultations by Pluto were attempted and/or observed by our team on 18 March, 12 May, 09 June, 14 June and 31 July 2007. A detailed account of the results will be presented. Globally, Pluto's atmospheric pressure appears to have stabilized since 2002, after the drastic two-fold increase observed between 1988 and 2002.
We have used the differences between the predicted and observed impact parameters and timings of the occultations to derive the offset of the DE413 JPL ephemeris with respect to the actual position of Pluto in the sky.
According to the events, the (Observed - Calculated) offsets in right ascension and declination lie in the ranges (-50,-100) mas and (+50,+80) mas, respectively.
Finally, we will present results from service mode observations of Nix and Hydra, performed with Adaptive Optics by the ESO/VLT/NACO instrument in J, H and Ks bands during the first semester of 2007.
We thank Bruce Gary (Hereford Arizona Observatory) for providing us with a light curve from the 18 March 2007 event.
Andrei Alexandre
Assafin Marcelo
Bath K.
Behrend Raoul
Beisker Wolfgang
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