The dust jets of P/Swift-Tuttle 1992t

Details The dust jets of P/Swift-Tuttle 1992t The dust jets of P/Swift-Tuttle 1992t

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..699j&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 9, p. 699-704

Astronomy and Astrophysics

Astronomy

10

Astronomical Models, Axes Of Rotation, Comet Nuclei, Comets, Dust, Plasma Jets, Astronomical Observatories, Charge Coupled Devices, Data Reduction, High Resolution, Outgassing, Radiation Pressure, Radio Telescopes

Scientific paper

Comet P/Swift-Tuttle 1992t was observed during 17 nights from 20 November to 1 December 1992 at the Pic du Midi Observatory. The CCD images obtained by the 1.05 m telescope showed the existence of spiral dust jets. In particular, a strong dust jet was easily detectable on the high resolution images in late November. We used a preliminary simple model, in which we neglected the solar radiation pressure, to derive the rotation period (2.7-2.9 days) and the spin axis orientation of the nucleus. We also determined an expansion velocity of the dust of 0.3km/s in the jet and an opening angle of 20 deg. The comparison with the 1862 passage of P/Swift-Tuttle seems to indicate that the rotation period is constant, but that the spin axis could precess.

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