Observations Of Comet 73p/sw3 During Its Closest Approach To The Earth.

Details Observations Of Comet 73p/sw3 During Its Closest Approach To The Earth. Observations Of Comet 73p/sw3 During Its Closest Approach To The Earth.

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5404t&link_type=abstract

American Astronomical Society, DPS meeting #39, #54.04; Bulletin of the American Astronomical Society, Vol. 39, p.524

Astronomy and Astrophysics

Astronomy

1

Scientific paper

In May 2006 comet 73P/SW3 passed at less than 0.1 AU from Earth providing us an unique opportunity for high spatial resolution study of its coma. This event was expected to be very interesting because the comet had broken apart in 3-4 fragments in 1996. The 2006 apparition has been even more interesting because the fragments produced in 1996, when approaching the Sun, were continuously breaking apart. The process produced many small sub-fragments with the subsequent exposure of the interior of the nucleus to the solar radiation, giving us the possibility to observe fresh, not yet contaminated, material coming directly from the interior of the nucleus.
During observing campaigns at ESO-Chile in the period April-June 2006, two of the main fragments (B & C) have been observed during their closest approach to the Earth.
The observations consisted in narrow band imaging in the visible and near-IR, linear and circular imaging polarimetry and circular spectropolarimetry in the visible.
In the presentation we will give some results obtained from these campaigns. We will shown that both color and polarization maps have a strong gradient with the nucleocentric distance, indicating a change of the grain characteristics with time, probably due to sublimation of ices and/or organic grains.

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