The gas distribution of comet Halley and its relation to the nucleus rotation

Details The gas distribution of comet Halley and its relation to the nucleus rotation The gas distribution of comet Halley and its relation to the nucleus rotation

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1471c&link_type=abstract

The Astronomical Journal, vol. 108, no. 4, p. 1471-1475

Astronomy and Astrophysics

Astronomy

4

Comet Nuclei, Halley'S Comet, Light Curve, Molecular Gases, Molecular Spectra, Photodissociation, Spatial Distribution, Astronomical Photometry, Astronomical Spectroscopy, Charge Coupled Devices, Spectrographs

Scientific paper

We used a set of spatially resolved spectra of comet Halley to explore whether the gas distribution profile could be inverted to yield information on the rotation of the comet. The data were obtained both pre- and post-perihelion. The pre-perihelion data showed reasonable symmetry and so were used to define the lifetimes against photodissociation of the various molecules. These lifetimes were then used to define the lifetimes against photodissociation of the various molecules. These lifetimes were then used along with a nonsteady-state vectorial model to fit the post-perihelion gas distribution profiles. The resulting molecular lightcurves are compared with the photometric lightcurves of Schlicher et al. (1990) to show that the rotational information is encoded in the observed gas distribution within the coma. The molecular lightcurves can differentiate between the preferred Schlicher et al. average period and the period they find for the same time interval as the spectra.

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