Polarimetric CCD imaging of Comet Levy (1990c)

Details Polarimetric CCD imaging of Comet Levy (1990c) Polarimetric CCD imaging of Comet Levy (1990c)

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..288r&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 5, May 1992, p. 288-292. Research supported by INSU.

Astronomy and Astrophysics

Astronomy

23

Astronomical Polarimetry, Charge Coupled Devices, Comet Heads, Okazaki-Levy-Rudenko Comet, Cosmic Dust, Polarization (Waves)

Scientific paper

During five consecutive nights (15-19 August 1990), Comet Levy (1990c) was observed at Pic du Midi Observatory (France) with the 2-m telescope by a videopolarimetric method. During the observation period, the phase angle decreased from 21.6 to 17.6 deg. The evolution of polarization degree with phase angle has been derived in various regions of the inner coma. Typically, at 2500 km from the nucleus, the inversion angle is found to be equal to 22.0 deg while the slope at this point is equal to 0.29 percent per degree. In the inner coma, an increase of the inversion angle with increasing distance from the nucleus may be noticed, together with a decrease of the slope at inversion angle. A map of the distribution of the polarization degree in the inner coma is presented for the night of 19 August 1990 (near 0100 UT). Some structures on the map could be associated with dust ejection from the nucleus.

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