Occultations of stars and radio sources by comets: Predictions and observing prospects

Details Occultations of stars and radio sources by comets: Predictions and observing prospects Occultations of stars and radio sources by comets: Predictions and observing prospects

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984coas.conf..105b&link_type=abstract

In JPL Cometary Astrometry p 105-122 (SEE N85-25015 14-89)

Astronomy and Astrophysics

Astronomy

Comet Tails, Cometary Atmospheres, Radio Occultation, Stellar Occultation, Astrometry, Astronomical Photometry, Charge Coupled Devices, Comet Nuclei, Electromagnetic Absorption, Extinction, Ground Tracks, Halley'S Comet, Solar Orbits, Space Observations (From Earth)

Scientific paper

The results that might stem from observations of occultations of stars and radio sources by cometary comae and ion tails are outlined. Taking account of the current orbital accuracy of P/Halley, specific predictions of stellar appulses with that comet, including preliminary topocentric circumstances, are presented. A crude model of the absorption of starlight by grains in a dusty comet supports the notion that stellar extinction may be observable in practice. Some thoughts on observing techniques are set down, discussing the merits of a two-dimensional detector (a CCD camera) and a conventional aperture photometer. The need for accurate photometric observations with time resolution approx. 1 sec is stressed because the interval of greatest extinction will usually be brief. Finally, the efficacy of undertaking accurate relative astrometry of comets during predicted approaches to stars is explored.

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